TCP Window Scaling supported on 3750G and 2960G switches?
We have the 3750G with the IOS version 12.2(35)SE5. Does this IOS version and switch support the TCP Window Scaling detailed in this doc? The doc says Release 12.2(8)T. And I don't see the 3750G or the 2960G platforms listed in the doc. I'm guessing they're not but rather than guess, I thought I'd ask. Thanks
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/tcpwslfn.pdf
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The doc says you may see better performance.
Indeed you may, but the doc also notes "Do not use this command unless you clearly understand why you want to change the default value.".
The two common situations where there's possible benefit to increasing the device's TCP receive window are: to allow faster FTP/RCP downloads to the device or to support quicker BGP bulk transfers. The former is limited by write speed to flash and the latter might be unusual to need > 64 KB for BDP.
Also, BTW, if you do find a need to work with scaled TCP receive windows on a Cisco device, you probably also should enable (optional) SACK.
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Hi everyone,
I was looking at this list: http://www.adobe.com/products/premiere/tech-specs.html
while trying to decide which graphics card to buy to take advantage of Mercury playback. I couldn't help but notice that there is not a single card listed that is compatible for both CUDA and Open CL in windows. Do I really have to pick one or the other? In that case, which would be more beneficial to a Premiere Pro workflow that utilizes a lot of dynamic links to After Effects? As a side note, I use Photoshop a ton, and would love to keep my GPU acceleration in that arena as well.
Thanks!
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They are not that different, while 'porting' doesn't imply completely automatic process. Rewriting existing libraries from one language to another is something almost any developer is familiar with.
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In the Logic Score window, I created a quarter F2 bass note, but the stem is facing upward and I cannot seem to force it to point downward.
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ACE default handling of the TCP Window Scale option
Can someone tell me a reasonable explanation why the default action of the ACE is to clear the window-scale option in SYN-segments? We were long baffled why some customers (specifically the ones with larger latencies) were suffering from poor TCP transfer speeds and resets. Packet captures confirmed the fact that the ACE was clearing window-scale options, causing the advertised receive windows to be remarkably small as the scaling factors were removed.
Isn't intermediate tampering with the window-scale option a widely known source for TCP performance problems? Window scaling is after all a widely used TCP extension. That's why I'm curious to know why such default behaviour from the ACE.
Our problem was of course finally resolved by explicitly allowing the window-scale option using a parameter map.HI Timo,
As you know if you allows the ACE to use a window scale factor that essentially increases the size of the TCP send and receive buffers. The sender specifies a window scale factor in a SYN segment that determines the send and receive window size for the duration of the connection.
You have defined tcp-options scale allow in the parameter map but have not specified to which scale factor this should scale to.
The TCP window scaling feature adds support for the Window Scaling option in RFC 1323. It is recommend that increasing the window size to improve TCP performance in network paths with large bandwidth, long-delay characteristics. This type of network is called a long fat network (LFN).
But you have not configure a TCP window-scale factor which is essential for network paths with high-bandwidth, long-delay characteristics, using the "set tcp window-scale " command.
The window scaling extension expands the definition of the TCP window to 32 bits and then uses a scale factor to carry this 32-bit value in the 16-bit window field of the TCP header.
You can increase the window size to a maximum scale factor of 14.
Typical applications use a scale factor of 3 when deployed in LFNs but in you case if this is a LFN you are using default which is 0.
So here in your case you can select how much scale factor is needed to be defined from the range 0-14 , otherwise even if you have defined in the tcp-options windlow-scale allow, but as you have not define to what factor it should scale to , so it will always use the default scale factor which is 0, means no scaling at all.
To set the TCP window-scale factor to 3, add the second command as well in your parameter map:
host1/Admin(config-parammap-conn)# tcp-options window-scale allow ---> Defined already
host1/Admin(config-parammap-conn)# set tcp window-scale 3 ----> Needed to be added else "default scale factor 0" will be taken
You can check in the following URL at cisco docs wiki for how ACE handles Connection at Layer 4 (L4) and Layer 7 (L7):
http://docwiki.cisco.com/wiki/Cisco_Application_Control_Engine_(ACE)_Module_Troubleshooting_Guide,_Release_A2(x)_--_Troubleshooting_Connectivity
Here are the details of how a tcp-options scale windows works:
The window scale extension expands the definition of the TCP
window to 32 bits and then uses a scale factor to carry this 32- bit
value in the 16-bit Window field of the TCP header (SEG.WND in RFC-793).
The scale factor is carried in a new TCP option, Window Scale.
This option is sent only in a SYN segment (a segment with the SYN bit on),
hence the window scale is fixed in each direction when a connection is opened.
(Another design choice would be to specify the window scale in every TCP segment.
It would be incorrect to send a window scale option only when the scale factor changed,
since a TCP option in an acknowledgement segment will not be delivered reliably
(unless the ACK happens to be piggy-backed on data in the other direction).
Fixing the scale when the connection is opened has the advantage of lower
overhead but the disadvantage that the scale factor cannot be changed
during the connection.) The maximum receive window, and therefore the
scale factor, is determined by the maximum receive buffer space.
In a typical modern implementation, this maximum buffer space is set
by default but can be overridden by a user program before a
TCP connection is opened. This determines the scale factor,
and therefore no new user interface is needed for window scaling.
Window Scale Option The three-byte Window Scale option
may be sent in a SYN segment by a TCP.
It has two purposes:
(1) indicate that the TCP is prepared to do both send and receive window scaling, and
(2) communicate a scale factor to be applied to its receive window.
Thus, a TCP that is prepared to scale windows should send the option,
even if its own scale factor is 1. The scale factor is limited to
a power of two and encoded logarithmically,
so it may be implemented by binary shift operations.
TCP Window Scale Option (WSopt):
Kind: 3 Length: 3 bytes
+---------+---------+---------+
| Kind=3 |Length=3 |shift.cnt|
+---------+---------+---------+
This option is an offer, not a promise; both sides must send
Window Scale options in their SYN segments to enable window
scaling in either direction. If window scaling is enabled,
then the TCP that sent this option will right-shift its true
receive-window values by 'shift.cnt' bits for transmission in
SEG.WND. The value 'shift.cnt' may be zero (offering to scale,
while applying a scale factor of 1 to the receive window).
This option may be sent in an initial segment (i.e., a
segment with the SYN bit on and the ACK bit off).
It may also be sent in a segment, but only if a Window
Scale op- tion was received in the initial segment.
A Window Scale option in a segment without a SYN bit should be ignored.
The Window field in a SYN (i.e., a or ) segment itself is never scaled.
Using the Window Scale Option
A model implementation of window scaling is as follows
All windows are treated as 32-bit quantities for storage in
the connection control block and for local calculations.
This includes the send-window (SND.WND) and the receive- window
(RCV.WND) values, as well as the congestion window.
* The connection state is augmented by two window shift counts,
Snd.Wind.Scale and Rcv.Wind.Scale, to be applied to the
incoming and outgoing window fields, respectively.
* If a TCP receives a segment containing a Window Scale
option, it sends its own Window Scale option in the segment.
* The Window Scale option is sent with shift.cnt = R, where R
is the value that the TCP would like to use for its receive window.
* Upon receiving a SYN segment with a Window Scale option containing
shift.cnt = S, a TCP sets Snd.Wind.Scale to S and sets Rcv.Wind.Scale
to R; otherwise, it sets both Snd.Wind.Scale and Rcv.Wind.Scale to zero.
* The window field (SEG.WND) in the header of every incoming segment,
with the exception of SYN segments, is left-shifted by Snd.Wind.Scale
bits before updating SND.WND: SND.WND = SEG.WND << Snd.Wind.Scale
(assuming the other conditions of RFC793 are met,
and using the "C" notation "<<" for left-shift).
* The window field (SEG.WND) of every outgoing segment, with the
exception of SYN segments, is right-shifted by
Rcv.Wind.Scale bits: SEG.WND = RCV.WND >> Rcv.Wind.Scale.
TCP determines if a data segment is "old" or "new" by testing
whether its sequence number is within 2**31 bytes of the left
edge of the window, and if it is not, discarding the data as "old".
To insure that new data is never mistakenly considered old and vice- versa,
the left edge of the sender's window has to be at most 2**31 away
from the right edge of the receiver's window. Similarly with the
sender's right edge and receiver's left edge. Since the right and
left edges of either the sender's or receiver's window differ by
the window size, and since the sender and receiver windows can be
out of phase by at most the window size, the above constraints imply
that
2 * the max window size must be less than 2**31,
or max window < 2**30 Since the max window is 2**S
(where S is the scaling shift count) times at most 2**16 - 1
(the maximum unscaled window),
the maximum window is guaranteed to be < 2*30 if S <= 14.
Thus, the shift count must be limited to 14 (which allows windows of 2**30 = 1 Gbyte).
If a Window Scale option is received with a shift.cnt value exceeding 14,
the TCP should log the error but use 14 instead of the specified value.
The scale factor applies only to the Window field as transmitted
in the TCP header; each TCP using extended windows will maintain
the window values locally as 32-bit numbers. For example,
the "congestion window" computed by Slow Start and Congestion Avoidance
is not affected by the scale factor, so window scaling will not introduce
quantization into the congestion window.
Hope it will resolve your issue, else get back to us for further discussion.
Best regards,
Sachin Garg
Message was edited by: sachinga.hcl -
Maximum Nodes supported for NLB and Cluster in Windows Server 2008 Standard Edition ?
Hi.
I am looking for information How many nodes supported for NLB and Cluster in Windows Server 2008 Standard Edition ?
If you can provide for all the versions that would be great.
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You can configure a Windows server 2008 NLB cluster with up to 32 nodes. However,
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For more detailed information, please refer to the link below:
FAQ Week for NLB: Tuesday
Best regards,
Susie -
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This sounds to me that your Parallels XP file system is corrupted and not the OSX file system.
Have you checked the XP file system while running the Parallels XP yet ?
However, it would be better to ask such question in the Parallels Forum http://forum.parallels.com/
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HP LaserJet and Color LaserJet - Windows 7 support
To help customers successfully use their products with Windows 7, HP has identified recommended drivers per product. Please visit the following support documents for more information:
HP LaserJet and Color LaserJet - Windows 7 support
Deskjet, Officejet, or Photosmart
If you are having an issue with a windows 7 software install or driver, please start a new thread for greater visability.
I am an HP employee.
Say Thanks by clicking the Kudos Star in the post that helped you.
Please mark the post that solves your problem as Accepted SolutionNot to be confused with the title of this thread, because this tool will not work with installing most LaserJets, but try the HP Printer Install Wizard and let me know any error messages you get.
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3. What happened when you used the HP Print and Scan Dr?
Lastly, If you do not answer these questions and others I know I will have, then I wish you the best of luck with your printer installation. Do not be mislead, just because I do not work for HP doesn't mean I'm not an expert.
Don't forgot to say thanks by giving "Kudos" if I helped solve your problem.
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Yoga S1 Windows 8.1 Activation Disabled and poor (or no support from Lenovo at all).
Dear Lenovo Friends,
I've purchased Thinkpad Yoga S1 with Windows 8.1 onboard.
I've had an OS problem that leaded me to order Recovery DVDs via Lenovo Thinkpad Support in Poland (thanks, got disc set in 7 days).
After reinstallation the WIndows 8.1 OS keeps saying my licence code embedded into BIOS is invalid and I can no longer activate the system. See the event log for sample try and fail on activation my system, please.
Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-Security-SPP" Guid="{E23B33B0-C8C9-472C-A5F9-F2BDFEA0F156}" EventSourceName="Software Protection Platform Service" />
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<Data>0xC004F069</Data>
<Data>9D6TC</Data>
<Data>?</Data>
<Data>?</Data>
</EventData>
</Event>
I've contacted the Lenovo Support in Poland and they tend to tell that this is because Microsoft has invalidated my codes for unknown reason. Contacting Microsoft they told me that it its vendor's (Lenovo) problem and they are not responsible - shall I obtain new licence key from Lenovo. The Polish Thinkpad support is working on the problem since January the 9th, with no success.
The Windows grace period is already over and I cannot use my ultrabook now without activating the licence.
Is this the famous Thinkpad support quality? I already own 4 Thinkpads and sorry gyus but I'm considering swithing to some other vendor.
When I called them, the solution provided by the Thinkpad support was... "would you please reainstall the OS once more to get another grace period?" I was thinking it was a kind of joke, but it wasn't... Asking for the responsibility of the Lenovo for the Windows OS they provided I was told that Lenovo is not responsible and I was given the advice to buy the hardware with no OS next time, have box licence from Microsoft separatelly.
I'm really disappointed. This is my last Thinkpad I believe. It seems even having the warranty it is not enoug to get support from Lenovo - I'm on my own...
Regards,
P.
Solved!
Go to Solution.Solved!
Finally I've got another DVD recovery set from Lenovo. Now it works. Seems that the first DVD set was invalid .
Regards,
P. -
TCP Timeouts in Native Windows 7 64-bit (wired and wireless)
I am having some major headaches with this new laptop in regards to network stability. I have a W510 4318CTO with the Ultimate-N 6300 AGN adapter. Here is what I'm seeing:
Prior to installing Virtual PC/XP Mode, whenever I am browsing the web or accessing samba shares, I occasionally get spurts of timeouts. Sometimes the timeouts are inescapable, but oddly enough the issue surfaces less after a hibernation than after a reboot or shutdown/start. Google Docs is one thing that is especially unstable. Either the icons don't load or the style sheet doesn't load or I can't click on anything or I can't save a document or open a document. This happens across all browsers when run in regular old Windows 7. I tried adjusting affinity and resetting tcp and reinstalling the network drivers and scanning for malware and yada yada yada.
I have made queries on Microsoft Connect and TechSupportForum and nothing I've tried is helping. This problem doesn't happen on my XP desktop at all, and very strangely, this doesn't happen in XP Mode on the same laptop at the same time as the issue surfaces in native win7. If I ping the gateway, I get timeouts at the same time as the issue manifests and I get longer response times when making network requests. I have been hammering this issue for the entire month and can't get past it. I've tried uninstalling Lenovo's Access Connection tool and that didn't help either. I tried this over the 82577LM gigabit wired adapter as well and have the same issues but they occur less than in wireless mode (which I would expect).
I am quite an expert on Windows, but this issue has brought me to my wits end. I am an inch away from blowing the preinstall away and starting from scratch, but I just don't want to invest so much time in reinstalling everything. I've had enough trouble with working around power management issues on this new laptop and I just want this fixed.
If you can solve this, I would be forever grateful. I feel like I'm in the empty hell of a network admin's nightmare.
- SteveHello,
If go into the Device Manager (filename: DEVMGMT.MSC), select View→Show Hidden Devices and examine the Non-Plug and Play Drivers tree, are there any old device drivers left over from previously installed security or connectivity software? If so, perhaps one of those is the culprit and disabling or uninstalling it will solve the problem.
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Regards,
Aryeh Goretsky
I am a volunteer and neither a Lenovo nor a Microsoft employee. • Dexter is a good dog • Dexter je dobrý pes
S230u (3347-4HU) • X220 (4286-CTO) • W510 (4318-CTO) • W530 (2441-4R3) • X100e (3508-CTO) • X120e (0596-CTO) • T61p (6459-CTO) • T43p (2678-H7U) • T42 (2378-R4U) • T23 (2648-LU7)
Deutsche Community Comunidad en Español Русскоязычное Сообщество -
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Hi experts,
I try to find oracle 10g client/database in 32 bit window 7.
I got message that the system does not support oracle 10gR2.
Any suggestion?
Thanks
JimThanks for your information.
I got below information as
====
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=======================================================================
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=======================================================================
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Check complete. The overall result of this check is: Passed
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Where can we find oracle version for window 7?
Thanks
Jim -
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Hi Maxim ,
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https://helpx.adobe.com/acrobat/using/flash-player-needed-acrobat-reader.html
Flash Player is required to view flash content in PDF' ,PDF' portfolio .
Please try the same and let us know if you face any challenges .
Regards
Sukrit Dhingra -
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Hello everyone!
I have a question about support of W530 in Windows 10.
Lenovo is planning to support this model and release drivers for the W530?Hello.
I should definitely think they'll get full support, as long as the parts makers such as Intel - nVidia etc. release drivers for them. I'm running my W520 on Win10 now, build 9926, and everything works perfectly on Win8/8.1 drivers already.
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