CPU limits on K7T266Pro2?

I currently have a K7T266Pro2 with an Athlon XP1700+ cpu, and would like to get one last upgrade before replacing the mobo. I should be able to grab an XP2400+ for about 60 bucks and use it in this mobo, correct?

https://forum-en.msi.com/index.php?threadid=23762&sid=

Similar Messages

Question about 1 CPU limitation

what about dual core CPUs or CPUs with hyperthreading enabled? Is the 1 CPU limitation on a per socket basis like the other Oracle products, or is it limited to one physical CPU core? thanks.
-js

im wondering how this is acheived though? It is via cpu_count because I change it (up to a value of 3)
SQL> show parameter cpu
NAME TYPE VALUE
cpu_count integer 1
parallel_threads_per_cpu integer 2
SQL> alter system set cpu_count = 10 scope = both;
System altered.
SQL> show parameter cpu
NAME TYPE VALUE
cpu_count integer 3
parallel_threads_per_cpu integer 2

FDS Express Single CPU limitation

Could somebody go in to a bit more detail about the FDS
Express single CPU limitation? What I'd like to know is whether the
definition of "a single CPU" refers to the number of processors, or
the number of cores? If I get a machine with dual-core processor
for our production environment, is this in violation of the
license? Also, I'm currently using a Core 2 Duo MacBook Pro for my
development machine and I haven't seen or received any
complaints/errors, so I just wanted to make sure. Thanks.
Evan

I guess there's something to be said for thoroughly reading
up on something before you ask any questions, like
reading
the FAQ.

Is there a way to assign CPU limitations to a specific software ?

Is there a way to assign CPU limitations to a specific software ?
For example.. when I launch a render.. I don't care if it takes 4hours or 6hours... I prefer that some CPU is kept free so not to slow down the rest of my activities during the day. Is there a way to assign to a specific application a maximum in CPU usage? Or maybe just one core?
Obviously I am asking this for applications that don't have this option internally... I've seen some that let you choose single or dual core for example.
Is there an external software (?) a OS setting (?) or so to do this?

I found this where they also speak about RENICE...
http://hints.macworld.com/article.php?story=20110131001708255
To me is greek.. but seems ok.. I don't understand if the other CPU is freed for other apps or is "blocked" in some way (making this useless for my needs)

Konqueror browser for Linux has an useful CPU limitation feature for websites using Flash content. Can you add such a feature in Firefox?

I have recently found that Konqueror browser for Linux can help user to limit cpu usage while visiting a website using flash technology by changing settings in the Flash section and adjusting the slider from VERY HIGH settings to HIGH and MEDIUM and so on. It actually works, and it does not have a direct impact on the general performance for flash player but it may generate some conflicts if other extensions such as add-blocker or click-to-flash are enabled also.
Maybe you can add a similar setting in Firefox in the browser option section or just as an useful addon or extension.

Sorry for being late with my reply. I've just tested that addon that you mentioned in your post ( https://addons.mozilla.org/en-US/fire.../system-monitor/ ) , it looks like a system monitor and nothing more than that.
As for the memory tip ( about:memory ) I agree that it can be extremely useful for users that have less than 1 gb memory installed on their system. I know very little about computers but I can tell your tip for optimizing memory usage in firefox has merits.
Me, I have another problem with cpu overload in Firefox, Internet Explorer, Opera and most of the browsers with flash support enabled. Each and every time time I visit a page that features all sort of adds and gadgets based on flash technology, and each time I try to watch a video online my cpu goes all the way up to 100% and stays there until i finally decide to close the browser.
I am running winxp and also linux on a Dell Optiplex GX260 machine with 2000 MHz cpu, 1024 Mib ram and 128 Mib video card, it is not the best computer in the world but still 2000 MHz should be enough for a limited and uneventful web experience.
It is not as much an issue with the web browser, any browser, the whole problem is caused by funny people claiming to be deeply involved with web development, and promoting flash technology for ages instead of choosing other alternatives, more user friendly. All I am saying is that flash ruined the entire web experience making people to believe that they actually need dual-core cpu and coreduo and deepfreeze cpu and so on which is only partially true.
I always get better results for cpu usage when watching online videos that use media player as default player and not flash player, and my cpu stays below 70% usage which is not much but still it is not 100% usage.
Konqueror offered me a nice surprise, and I was able to limit cpu usage once I moved that slider from Very High setttings for flash player to Medium settings. I got something between 80-90% cpu usage as a result, and I was very pleased to finally see a working solution to my problem at least for linux if not for windows.
The only other browser that I can use for windows only, which handles both flash player and cpu usage well is Kmeleon browser which is a long forgotten project but does offer nice features once you find some plugins that it needs to make it come to life again.

Windows Small Business Server 2011 Standard CPU Limitation

How many CPU's can be used with Windows Small Business Server 2011 Standard? Is there a limitation to the number of cores per CPU?

Hi,
for SBS 2011 standard the limit is 4 sockets, no specific limit set for cores.
SYSTEM REQUIREMENTS SBS 2011
1.4 GHz x64 processor or 1.3 GHz dual-core processor
Up to 2 sockets (SBS 2011 Essentials) or 4 sockets (SBS 2011 Standard)
RAM: 2GB min / 4 GB rec / 32 GB max (SBS 2011 Essentials)
RAM: 8GB min / 10 GB rec / 32 GB max (SBS 2011 Standard)
160 GB min disk space (SBS 2011 Essentials)
120 GB min disk space (SBS 2011 Standard)
10/100 Network Interface Card
more information:
http://www.microsoft.com/sbs/en/us/system-requirements.aspx
Regards Ronny
Visit my Blog or follow me on
Twitter

CPU limits in profile

Hi all,
11.2.0.1
aix 6.1
We have a new app to be implemented in our existing PROD db. Since this is not so priority app we want to control/limit is CPU usage so not to affect the critical app (priority) that is currently running in our PROD dataabase.
I am creating this profile for this new app.
CREATE PROFILE app_new LIMIT
   SESSIONS_PER_USER          UNLIMITED
   CPU_PER_SESSION            3000
   CPU_PER_CALL               3000
   CONNECT_TIME               45
   LOGICAL_READS_PER_SESSION DEFAULT
   LOGICAL_READS_PER_CALL     1000
   PRIVATE_SGA                15K
   COMPOSITE_LIMIT            5000000;
I am only concern with CPU and Memory, so the parameter I am concerned with is CPU_PER_SESSION, CPU_PER_CALL, and PRIVATE_SGA.
My question is, what is the good low limit value for these parameters?
CPU_PER_SESSION Specify the CPU time limit for a session, expressed in hundredth of seconds.
CPU_PER_CALL Specify the CPU time limit for a call (a parse, execute, or fetch), expressed in hundredths of seconds.
What happens if my cpu_per_session & cpu_per_call reaches 3000? will it abort the process?
Thanks a lot,
zxy

>Maybe you can give me basic safe commands just to allot 20% cpu to user HR.
And safe command is :
BEGIN
DBMS_RESOURCE_MANAGER.CREATE_SIMPLE_PLAN(SIMPLE_PLAN => 'SIMPLE_PLAN1',
CONSUMER_GROUP1 => 'MYGROUP1', GROUP1_PERCENT => 80,
CONSUMER_GROUP2 => 'MYGROUP2', GROUP2_PERCENT => 20);
END;
Source:Creating a Simple Resource Plan
But a complete study of Resource plan manager need to be well understand and that is free, easy to understand by docs :
Managing Resources with Oracle Database Resource Manager
Just start reading above link and navigate by clicking on next page link. Trust me, only this is the valid and safe way to learn the things.
Regards
Girish Sharma

CPU limitation for a userer

hi
how do i limit/assign a CPU / core to a user?
My current Server is running with 2.47 load i want to limit zimbra user on it to increase Zimbra performance.how do we do?
Regards

An application will not benefit from multiple CPUs unless it was designed to do so. A single process can only run on one CPU. You can use the taskset command to set CPU affinity when starting a program. From an administration standpoint I think this practice is nonsense.
If you need to limit the number of CPUs to comply with licensing you can edit /etc/grub.conf and add an appropriate kernel prameter, e.g. maxcpus=2.
I'm not aware that there is an option to partition your CPU or set CPU affinity per user. Perhaps machine virtualization might be work-around.
The following might be interesting: http://www.ibm.com/developerworks/linux/library/l-scheduler/
To maintain a balanced workload across CPUs, work can be redistributed, taking work from an overloaded CPU and giving it to an underloaded one. The Linux 2.6 scheduler provides this functionality by using load balancing. Every 200ms, a processor checks to see whether the CPU loads are unbalanced; if they are, the processor performs a cross-CPU balancing of tasks.
A negative aspect of this process is that the new CPU's cache is cold for a migrated task (needing to pull its data into the cache).
Edited by: Dude on Jan 27, 2012 1:20 AM

RAID limitation on K7T266Pro2-RU

Note: I am an experienced tech and the BIOS and all drivers are up to date.
I recently installed WinXP Pro on this board and used a 40gig-7200rpm IBM drive using the onboard Promise PDC20265 controller as a master, single drive striped array. You can have single drive 'fake' striped arrays on this ide controller and save the regular ide for other drives and also get some performance benefits by using separate channels.
The system is rock hard stable. By the way...if you want to ensure stability with the 'optimized settings' in the BIOS, I highly recommend using DDR with CL2. I've never seen a mobo as picky as this one when making tweaks to the BIOS settings!
I then attempted installing a second IBM drive (60gig 7200rpm) on the second Promise channel, and it properly configured a second 'fake' striped array and on we went to boot into WinXP. As soon as we hit the desktop though, the system just freezes up. I tried another exact same model drive, and even switched 80pin ide cables, all with the same result.
The MSI product description does state 'Note: only two hard disk drives will adopt RAID function', but I'm not sure exactly what THEY mean by that. I only have 2 drives total connected, but are they referring to only one raid set with up to 2 drives, or up to two raid sets with maximum of 2 drives, like my two 'fake' striped arrays?
If anyone else has any comments, including any MSI technicians, I'd appreciate them.
Thanks. 8)

Thanks for the very quick reply, but the link to the hacked bios won't let me into the ftp site. Even so, I'm a bit hesitant to apply any flash BIOS other than the most recent official release from MSI. My board is an RU and the link refers to just the R version. My board has the USB 2.0 onboard, and I'd hate to screw the board up. ;(

Adobe Camera Raw - CPU or RAM?

Hey All!
Please read the whole post, but if you want to cut to the chase, my question is: for ACR conversions would I be better off with an (Windows) 8-core system and 6gigs of ram, or a 4-core system and 12 gigs of ram?
I am a professional photographer who, after upgrading to some equipment that spits out serious file sizes, needs to upgrade his computer system. I shoot almost exclusively RAW and I rely primarily on Adobe Camera Raw to convert my files and open them in photoshop. While photoshop performance is a consideration, my biggest concern is to be able to open ACR images ridiculously quick.
Right now, working off 21 megapixel images on my current system, it takes between 10 - 20 seconds to open/convert a single file into photoshop. I'm aiming for a couple of seconds.
My current system (please don't laugh ... I know its bad):
XP 32-Bit
dual-core 2.00GHz
3G DDR2 Ram (with 3G switch enabled)
5400 rpm Hard Drives
Running CS4 and ACR 5.3
Future Set Up Considerations:
Vista 64-Bit
Processor/RAM
a) quad-core-Q9600 3.00 GHz with 8 gigs DDR2 (1150MHz)
b) i7-920 2.66 GHz with 12 gigs of DDR3 (1600 MHz) - adds about $500 to price - worth it?
c) 2 Xeon-quad-core-5530 2.40 GHz with 6gigs DDR3 (1600Mhz) - adds about $1000 to price - worth it?
d) something AMD?!?!
Hard Drives (7200rpm)
2 for images storage (one as an internal backup)
1 For operating system, applications, music, etc
1 For scratch disk
Basically, the question comes down to whether extra cores or extra ram will ultimately make the biggest difference in the ACR performance
During my testing on my (sad) currently system, here are my conclusions (let me know what you think):
Changing the 3G switch to allow the jump from 2 to 3 gigs of ram usage for applications makes no difference in performance
When I am opening up ACR files both cores show 100% usage (will that continue over 4 or 8 cores?)
Photoshop in general seems to be more CPU limited in my case than ram limited (most of the time is says 100% efficiency but things still take bloody long
From some more experienced users, or users who have quad or octa core system or systems with insane amount of ram, I woudl really appreciate your feedback!
Thanks for the long read!
~
Justin

Hey Zeno!
Thanks for the reply.
I would have to disagree thought that it is hard drive limited at this moment. Take a look at my task manager:
It was running about 5% before I started converting pictures, and then as soon as I started converting the pictures, both cores hit 100% (with little gaps between pictures), and then back to 5% after they were done. You can also see the ram alocation being increased with each picture that is opened.
So basically, I am wondering if going to a quad core will have all 4 CPU's hit 100%, thus coming close to doubling the speed. Or if I go i7 then with hyper threading it'll go to 8 effective cores. Or if I go to dual Xeon processors I'd have 8 cores and with hyperthreading effectively 16 cores.
I am wondering if anyone has experience with a quad core or octacore system that might be able to share some insight.
But I would agree that probably for now 6Gs of ram is probably plenty.
I also don't understand when you said:
"same goes with the CPU, the more cores you have the less benefit you get out of adding more of them"
Could you elaborate. Its just that it takes about 15-20 seconds to convert a single file, and space that out even over 50 photos, that is still 15 minutes of wasted time. Just trying to get the best I can without wasting needlessly.
Thanks a ton!
~
Justin

CPU load unbalanced and too low in multi-processor computers

I have a rather large test system 5-6000 VIs and we have noted some peculiar behaviour.
On a single processor system the application can take up to 100% of the available resources.
On a two processor system the application can take up to 50% of the available resources.
On a four processor system the application can take up to 25% of the available resources.
On an eight processor system the application can take up to 12-13% of the available resources.
I think you guys can get the gist of what I stated above (I didn't get pictures for 1 and 2 CPUs but I have observed the behaviour, personally)
We haven't done any specific multithreading code (we do lauch many parrallel processing loops dynamically = should be a good thing)
Why is the application behaving this way? Does anyone have a similar problem? Any tips?
Thanks for any help you can offer.
//David

You really don't provide enough information.
Is there really always something to do to keep a core busy at all times? Unless there is serious computations involved for solving a math problem, a typical VI should not be using a lot of CPU. (For example if it needs a full core today, it would not have been possible to even run the test a couple of years ago. That would be hard to believe). Don't overestimate how much a modern computer can do using only 5% of the CPU at any given time. I still run an acquisition system on a 120MHz Pentium 1 and LabVIEW 4. There are no performance problems even though the hardware is orders of magnitude slower than even a modern Atom processor on a netbook.
How many things can really occur at the same time? If you make your code overly sequential by lining everything up along error wires or by overuse of sequence structures, the code cannot be efficiently parallelized, no matter how hard the compiler tries.
How many of the 6000 VIs are called concurrently? How many require full CPU? If this is a test system, I assume that there is interaction with a device under test? Are the tests sequential or parallel? How many devices are tested at the same time? How much is post-processing compared to waiting for results? Are the tests really CPU limited??? Really???
Have you done any profiling? Did you identify the part that is most demanding? Could it be that a single greedy loop is consuming most of the CPU doing nothing?
Except for lengthy simulations or complex data processing, a typical application should never be CPU limited. The timings should be fully software controlled such that the code runs the same, independent of the power of the computer.
All that said, LabVIEW can easily keep all CPU cores busy if really needed and if programmed correctly and with parallel processing in mind. I have a complicated lengthy fitting code where I was able to keep 64 cores at near 100% (4 AMD 6274 CPUs with 16 cores each). As a more typical example, and compared to sequential execution, the parallelized code is 4.5x faster on a quad core I7 (if I disable hyperthreading in the bios, I get a 3.8x speed increase), so not only can it keep all four cores at 100%, it can even get a measurable boost from hyperthreading. On a six core I7, I get a 6.9x speedup, also keeping all cores busy.
I am not going to look at a project with 6000 VIs, but please show us some profiling data. Find the VI that carries most of the load and attach it if you want.
LabVIEW Champion . Do more with less code and in less time .

Internet browsing uses 100% cpu

Hello everybody.
This situation has driven me crazy the last 4 months and till now i have not figure it out.
Everytime i have a video streaming in my computer, CPU usage goes to 100%. It happens every time, either using internet explorer or Firefox or Google chrome. Even when i have a skype video call or a gtalk video call. Some description of each one:
Using internet explorer: While i am watching a youtube video, CPU limits up to 100% after 1 minute or sometime 5 minutes. I am not able to watch a 15min video. Internet explorer process uses 100%CPU. When i kill it via task manager, another instance of IE
appears with the same CPU usage. I also kill it and then 4 or 5 instances of rundll32.exe appear consuming 100CPU. If i kill them, explorer.exe uses 100% of cpu. If i do nothing and just wait, CPU is 100% for two hours. If i just kill only IE instances, taskmngr.exe
is consuming 40-50% of CPU for 1-2 minutes, then other processes like conhost or csrss consumes the same amount of CPU and after 4-5 minutes everything comes back to normal. That's the story everytime i use IE 11.0.9600.16518
Using Firefox: While video streaming, flash player process consumes all CPU. When i kill it, the same behaviour described above occurs.
Using Google Chrome: When i run it, 5-6 instances of google chrome appear in task manager and after some time this browser also hungs with 100CPU.
All above are also happening while i run Skype either i have a video call or just text messaging. Sometimes svchost is 25-30 % and system hungs.
Operating system is Windows 7 home premium 64bit with SP1, my graphics card is NVidia Gforce GT 230M (latest drivers 20% when these situations occur, my system is extremely slow and whatever i do, it limits up CPU usage.
Any assistance is acceptable. Thanks for the patience.

Hi,
First, I would suggest that you reduce the hardware acceleration on the computer and check if it helps.
a. Open Screen Resolution by clicking the Start button, clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
b. Click Advanced Settings, click the Troubleshoot tab, and then click Change settings.
c. Note that some video card drivers do not permit you to change settings.
d. Move the Hardware acceleration slider toward None to reduce or turn off video hardware acceleration.
This issue can be caused by confliction from one of the background programs or add-ons.
You may use Process explorer as Milos mentioned to find the root cause to fix the issue:
Process explorer:
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
You can follow the references below to troubleshoot the issue:
1. 3RD part app: Remove to check the issue
2. Drivers: Update or install compatible version
3. System process/service: Upload the log file for analyzing.
I also would like to suggest you use Windows Performance Recorder to check the issue:
Troubleshooting Windows Performance Issues Using the Windows Performance Recorder
http://blogs.technet.com/b/askpfeplat/archive/2013/03/22/troubleshooting-windows-performance-issues-using-the-windows-performance-recorder.aspx
To diagnose HDD and RAM, I would like to suggest you contact your computer vender.
Hope it helps.
Regards,
Blair Deng
Blair Deng
TechNet Community Support

T420s - experiencing CPU whine that is getting worse

Hello there!
I have a Lenovn T420s with an i7-2640M CPU @ 2.80 Ghz, Optimus, and 8gb RAM. I got this laptop as a replacement from Lenovo since they severely damaged my other T420s while trying to repair the bezel.
This laptop is experiencing CPU whine that is getting worse and worse. There was no CPU whine at all whatsoever when I received this replacement in December, but now it shows up whenever I scroll up and down a browser window, click on a link, or do other normal tasks on the computer.
It happens regardless of if I am on battery or using the AC adapter. I've also read the other T410/510 page about the CPU whine and saw that the only fix was to get a new motherboard, CPU, and GPU. I also saw this post: T420s High pitch whine but it doesn't look like it has been updated for a while.
I have a 3 year warranty on this laptop, but I am hesitant to send it in without knowing if a good fix has been found. I already had a terrible experience with sending the laptop in for service, and had an even worse experience when the tech came on-site to work on it.
Anyone else with this problem? Has Lenovo come out with a solution?
Thanks!

Hi all,
I'm experiencing coil whine or "CPU whine" on my T420s. It's completely intolerable.
Rather than trying to describe this noise, I've put together the start of a sound album documenting it. Please listen: http://soundcloud.com/discostrings/sets/t420s-coil-whine
I suffered through 2.5 years with this problem on my T410. I sent it in once to resolve the problem, but it wasn't fixed. I figured the issue would be resolved in subsequents ThinkPad generations and I'd put up with it until it was time to upgrade.
But the whine on my T420s is much worse. It is impossible for me to use it in a quiet environment. But beyond that, some of the tones and clicking it makes are audible from feet away even in an environment with air conditioners running and people talking. I've tried (and recorded) every important combination of power settings. With all power management turned off in the BIOS and with the CPU limited to its lowest setting, it is ALMOST tolerable (but not quite).
I am willing to do whatever it takes to fix this problem--I do not mind parting with the laptop for a while. I would be happy to send it in for an engineer to look at and fix. I would be happy to take it somewhere. I would be happy to attempt to fix it to my own satisfaction if I am guaranteed it will not void my warranty. If none of those are options, I guess I'll send it in for motherboard replacements until I get a good one. But I'm going to have this fixed. Because this beautifully-engineered machine is impossible for me to use as it is.
As I understand it, coil whine results from faulty or low-quality coils or capacitors on the motherboard that resonate at different power levels. Unless this is from a rare bad batch (which I doubt because of my experience with my T410), this is a result of using bargain-basement coils and capacitors or not adequately testing the units from different suppliers. It's probably the matter of a few dollars or cents in manufacturing the computer. Beyond that, it can often be fixed with a drop of glue.
I put the recording album up to demonstrate that this is an actual problem, and to familiarize those who haven't heard it with the problem. I hope it helps other in diagnosing the coil whine.
Please let me know the best way to proceed to get this fixed. Thanks.

Acrobat XI very sluggish on Yoga 3 Pro

I have noticed that Adobe Acrobat XI is very sluggish on the Yoga 3 Pro. Specifically laggy when zooming in and out, panning, scrolling, and full screen. This is especially apparent with full screen and quite annoying in tablet mode. However, using the Microsoft Reader app with the same PDF files does NOT experience this lag.
What I then discovered is that this has something to do with the Core M processor and it getting its power limited. If you change the power plan in OneKey Optimizer to High Performance (from Balanced, for example), Acrobat all of a sudden becomes quite snappy.
When in tablet mode, if you simply want to read a PDF file (and use Acrobat), you do not need "high performance", so to extend the unfortunately bad battery life of the Yoga 3 Pro, you would want to put it in Balanced or Power Saver -- this should still be sufficient to read PDF files, but it is not the case with Acrobat XI unfortunately.
I'm not sure which specific CPU limiting feature of the power plan is causing this issue in Acrobat, but I thought I would post this because I couldn't find anything on the internet on this issue.
Solved!
Go to Solution.

Please do let us know how things work out for you and then, if you would, please mark the appropriate message as the solution. It may help other members in the future.
Thanks!
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Questions and answers on DLM, sync speed and real ...

I was confused about some DML details and posted on a BE forum (https://avatar.bethere.co.uk/forum/viewtopic.php?t=43542) and got what was to me an incredibly helpful response from Tom (drsox). I thought it would be of interest to some readers here so copy it below. Once again, many thanks Tom.
1) FTTC DLM applies only between the cabinet and the modem?
>> Yes, as there isn't any broadband / data signal going anywhere further down the line to the exchange if you are on FTTC!
2) What are the different parameters that apply on this hop? I know there is a current sync speed, a current snr, a target snr and an ip profile. Anything else?
>> The IP profile isn't really related to DLM, it just "follows" your sync rate. In the past the IP profile would take up to 3 days to "follow upwards", leaving you with a high sync and awful speeds! This has been changed now on 21cn and "RE-ppp"ing (rebooting the router) would force the IP Profile to update instantly.
DLM changes the SNR target. So where BE have hard coded / set SNR targets such as 3db, 6db, 9db, 12db etc.. They only change upon user request. BT use their DLM system where line instability or line error counts are collected and analysed, the SNR target and interleaving settings are then modified in increments to try and stabilise the line.
This image shows quite well how, over a 6 day period, BTs DLM noticed that my line fault was fixed. I didn't get the full speed back for a week.
3) Is the ip profile the same as the BRAS profile?
>>Yes
4) The DLM keeps statistics of errors etc to dynamically change the ip profile?
>> Changes the SNR target and interleaving for the line which will reduce the speed, and therefor the IP profile.
5) There is a general theory that the DLM is incapable of telling the difference between an error and a modem power cycle, so that power cycling can cause your profile to lower. Is that correct?
>> Yes, if you resync / power cycle your router multiple times in a day it is likely to try and "combat the line errors" and reduce your sync rate by increasing the SNR and / or interleaving on the line.
6) Can other connections and disconnections have the same effect? For example, if I reboot the router (where this is separate from the modem)? Or use the router interface to disconnect/reconnect the broadband?
>> PPP drops (router reboots while leaving the BT Openreach VDSL modem on and connected) won't affect DLM. The IP profile will match your sync rate upon reconnection of the PPP session.
7) If you have a low ip profile, does this mean that the sync is limited to the ip profile?
>> Other way around, if you have a low sync rate then the IP profile will match the sync rate. If you get an awful sync rate and the IP profile follows downwards, then you resync higher but the router "keeps the PPP session open" (which is possible if you resync quick enough) then your IP profile will stay low, even though the sync is high. Until you reboot your router or disconnect and reconnect the PPP session.
8) Can the sync rate change dynamically without a reconnection? If the ip profile gradually rises, will the cabinet force a resync to make sure the customer is actually getting the benefit of the higher ip profile, or must the user intervene with a modem resync?
>> See above - Sync can rise without affecting the IP Profile and the cabinet does not force a RE-PPP.
8) As I understand it, if the ip profile gets stupidly low for some reason, it can only be reset by BT wholesale? This will only be done after a visit to your home and a telephone call from the engineer to the BT wholesale central admin?
>> Mixed reports plus I don't think people understand the difference between sync speeds, line faults, the delay in DLM increasing sync after a fault.. I expect half the reports on the BT forum are not related to a stuck BRAS / IP profile. It is possible for the ISP or a BT engineer to reset the IP profile and possibly DLM training.
9) (8) This applies to all ISPs using BT Wholesale: some may be more willing to force this process to happen on behalf of their customers, but none can cirumvent it?
>> GEA providers (I believe) still have DLM but don't have BRAS / IP profiles unless they implement their own.
10) Who sets the snr? As I understand it, the customer has no direct control. Is this different for different ISPs?
>> Mixed information again, I believe that BT Wholesale give providers DLM override controls and SNR settings but none? (or few) ISPs use this system.
11) Real download/upload speeds are physically limited by the sync rate. They are also naturally limited by local limitations (such as wireless connections), server limitations, and congestion at various points along the route? Any more? The congestion along the route will vary bewteen ISPs as they use different routes with different capabilitues.
>> It is possible for BTs regional or local cabinet network to become congested. Supposedly the minimum speed you should achieve over the BT part of the network is 15mbps. ISPs such as Plusnet, BT etc.. then layer their own "discriminatory" traffic management on top of that (ie, slow down torrents etc.).
12) Real speeds are 'unnaturally' limited by throttling. This will also vary from ISP to ISP. Sky claims to have none, and BT none except for p2p. PlusNet and John Lewis have significant (but well explained)throttling. All the more expensive operators have none.
>> What you said
13) The ip profile affects the sync rate, and therefore actual speeds. Does the ip profile effect actual speeds in any other way?
>> Not quite right. The IP profile directly affects the speeds you can achieve but the sync rate affects the IP profile. The sync rate is determined by the stability and quality of your line and what DLM thinks it can cope with.
14) Many people (including AndrueC above) report real speeds from speedtests that are consistent and not close to the ip profile. These can't be explained by congestion (that would make them inconsistent). They can't be explained by server limitations, as they are consistent accross servers and the same servers give better speeds to other people. They can't be explained by local limitations, too many people claim sudden drops where the local conditions have not changed. They should not be able to be explained by throttling, as they as seen for many ISPs who do not throttle (I don't hold with the ISP lying theory here). What other factors are there that can explain these cases?
>> AndrueC and some other Sky customers have strange symptoms where speeds are around 20mbps rather than the full sync speed. The only logical explanation is either local cabinet congestion, contention between BT and the provider's network (not enough investment by the provider) or artificial traffic management on the providers side. It is also possible that the router that the customer has attached to their line is unsuitable for the higher speeds. For example an old ethernet router may only be able to cope with 20 or 30mbps! A friend of mine has a TP-Link ethernet router running Tomato on a BT 80mbps service but the TP-Link's CPU limitation causes his service to only perform at around 68mbps; he has a replacement router on order. (Obviously wifi will significantly reduce performance).
15) If you get a stupidly low ip profile, how long can you except it to take before it climbs to something more reasonable? (eg in my particular case, my profile is currently around 15Mb, and from BT service line tests should be around 58Mb). And the classic question, is it best to power cycle the modem (1) never, (2) occasionally (how often) or (3) never if at all possible? Mine did jump from 3.5Mb to 15Mb on one power cycle. Was that just coincidence?
>> My FTTC line took about 6 to 7 days to go from 40mbps to 80mbps after a line fault. It is possible that your 3.5mbps to 15mbps increase was the "re-ppp" affecting the BRAS profile and that your sync had slowly been increasing over time.

what a waste of money sending an engineer to "fix a fault" which does not exist. Precisely.
In my original BE post to which Tom so helpfully responded, I began: It seems to me that DLM is an excellent concept with a highly flawed implementation, both technically and administratively. I think that sending out an engineer to fix an obviously flawed profile is the main example of an adminastrative flaw. I understand (I can't remember source, maybe Tom again) that they are sometimes relaxing the requirement for a visit before reset.
Maybe the DLM system is too keen on stability vs speed. This will keep complaints down from many people: most users won't notice speed too much as long as it is reasonable, but will be upset if their Skype calls and browsing are being interrupted too often.
However, it does lead to complaints from people who notice the drops after an incidence (as in your thread that has drawn lots of interest), or who only get 50 instead of 60. The main technical flaw is that DLM can so easily be confused by drops from loss of power, too much modem recycling, etc, and then takes so long to recover.

CPU limits on K7T266Pro2?

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