E3200 USB storage - transfer very slow

Hello
The E3200 transfer rate I get is approximately 2.5MB/s ,
That seems very slow, especially with the n configuration, the USB3 hard drive I attached
Is there a way to improve this?
P.S..
I'm using the latest firmware 10.0.03 (build 9)
Thanks

Sorry, but what you write is inconsistent and confusing.
First you wrote 2.5 MB/s and 6 MB/s which means megabyte per second (which is the rate you usually see in Windows Explorer). That translate into 2.5*8 = 20 Mbit/s or 20 Mbps which is megabit per second. There is no "spare" and no "overhead" in this calculation. Transfer rates only count the contents bytes transferred and don't include overhead or anything else.
It's a fact that with a wireless connection rate of 54 Mbit/s you can expect transfer rates of approx. 20-25 Mbit/s.
I suggest you look at it again:
1. What is the connection rate shown for your wireless connection?
2. When transferring files, what is the exact rate shown?
Because I am pretty sure if you carefully look at the units of those rates you'll see exactly what I have posted before:
with wired you get transfer rates of approx. 6-7 megabytes (MB) per second i.e. 48-64 megabit per second (mbps).
with a wireless 54 Mbit/s connection you'll see about 2.5-3 megabytes (MB) per second, i.e. 20-24 megabit per second (mbps) because that's the maximum transfer rate to be expected on a 54 Mbit/s link.
If you had really wired transfers with a rate of 5.4 Mbps, i.e. 5.4 megabit per second that would be very bad in any respect.

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Yes, there are many threads about slow usb transfer or slow i/o in general e.g. (not necessary linux 3-related)
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Was the issue present in kernel26 as well? What filesystem does your usb device have? How slow is the transfer?
Last edited by karol (2011-11-19 15:30:59)

Upload to Usb-Storage is very fast, that's why i can't umount!

Hi everyon
If i upload some stuff to an usb-storage it's like its uploading very very fast, like 100mb in 1 second, but in background it's still uploading(i can't umount). The problem is every program is showing me that the stuff is uploaded in 1-2 second. I have to wait everytime, but i don't know how long, and that's really annoying.
How can i fix it ?
/etc/fstab
/dev/sdb /media/sdb vfat rw,users,umask=000,uid=fatih 0 0
dmesg
usb 1-1: USB disconnect, address 4
usb 1-1: new full speed USB device using uhci_hcd and address 5
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sd 5:0:0:0: [sdb] 1000215 512-byte hardware sectors (512 MB)
sd 5:0:0:0: [sdb] Write Protect is off
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sd 5:0:0:0: [sdb] Assuming drive cache: write through
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sd 5:0:0:0: [sdb] Attached SCSI removable disk
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usb 1-1: USB disconnect, address 5
NOTE: I've tried it on Ubuntu, and there wasn't any problem.

But i don't know how long i have to wait.
Well, thats kind of the thing... It could be forever. The kernel/filesystem might decide to halt copying until you decide to sync _or_ add more files, so it can make all the pieces in the puzzle (partition) fit without defragmentation. See?
If you decide to mount with sync, you get a steady stream transfer to your device, and you will theoretically see how long the task will take. (am i mistaken?)
If you decide to go with nosync (default behaviour), this is not possible. But the benefit would be less defragmentation.
I guess that i would be possible to have the system tell you how long the actual "sync" manouver will take when you unmount, but as far as i know this is not implemented yet. Maybe you could file a feature request somewhere? (i dont know if the HAL scripts or notification-daemon is reponsible for the actual "information" you recieve)

Data transfer very slow on mac pro!! mac H/W unable to fit specifications.

Hi,
I am installinginternal disks on the quad mac pro and the transfer ratet in the mac are very slow!!!
the disks are: barracuda 7200.10 disks, 500 GB. Sta II 300, max ST3500630AS firmware 3.AAE . throughput:300mb.jumpred off to get the 300.
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According to seagate.com the maximum sustained data transfer rate:78MB/s
but in the mac the reallity is different: I am getting a transfer rate of 22MB/sec!!!!! . with out any application running and only making copy of the files!!!!
that means that the mac is only providing only 1/3 of the expected transfer rate for the disks..
so, is there a way that the MAC Pro gets all the normal transfer rate for those disks???
Is the Quad MAC Pro hardware unable to get the maximum throughput of the disks???
It seems that the mac is unable to get also the average transfer rate of those disks.. how to correct it???
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ps. just for fun: I am getting a faster transfer rate from an old power pc ,and old pc, and firewire 400 and old ide disks!!! (36MB/seg!!!)

Yup.
BThe latest Mac Pro are better, so if you have a new or 2 month old unit, Seagate should work, though I think there should be later firmware.
Some would say those drives take the cake or woRSe.
http://www.barefeats.com/hard91.html
SEAGATE PUZZLES
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http://www.barefeats.com/quad08.html

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Hi ComptonAlvaro,
Please check if we have other program is connecting the Internet when we use the SSTP.
Additionally, we could contact the ISP to check the stability of network.
Regarding the slow SSTP performance issue, we could refer to the following thread similar to this issue.
http://social.technet.microsoft.com/Forums/en-US/8e8e4220-af25-4627-bed2-47db8c04d318/sstp-and-slow-transfer?forum=winserverNIS
Please take the following steps to fix this issue:
1. Add new registry key and value “ TcpAckFrequency=1 ” for all NICs on VPN server, so that we can reduce ACK delay.
2. Disable Windows 2008 SNP feature, and restart VPN server
3. Disable TCP Checksum offloading on VPN server
Hope it will be helpful.
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
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Transfer rate with USB 5102 is very slow (8 updates/sec). Any possible way to increase it??

Taking 100 microsec data from 32 sensors we want to monitor results in real time. Because of slow data transfer protocol (niScope_InitiateAcquisition - niScope_FetchBinary8 loop) for USB NI5102 (~125ms) we can update only every 4 sec. Any way to speed it up? Is PCMCIA 5102 will do it faster (we don't have PCI)??

To verify, you wish to take data for 100 microseconds on each of 32 sensors and display the data in "real time." The problem is the overhead of the initiate/acquire, not the actual acquisition time or theoretical data transfer time. Have you considered taking all your data in a single acquisition? I assume you are already multiplexing the signal to the 5102. This will require a bit of work in setting up the advance trigger for the multiplexer and the reference trigger for the 5102, but this is far cheaper than buying another acquisition board. Your data acquisition sequence would then be:
Set 5102 for 64000 points, 20MHz, 0% trigger reference position (add more points if needed for settling time)
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Trigger 5102 to start acquisition
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Parse the data by splitting the array using your known timing
With this method, you only take the overhead hit once per scan instead of 32 times. You should be able to get single-digit Hz update rates. You can speed up the data acquisition by using both channels of the 5102 (unless you are already doing this for some sort of data reduction). If you are doing this in LabVIEW, pass your data into a queue in your acquistion loop and pull it out of the queue in a separate loop to process and display. This allows you to time multiplex the acquisition and display.
This account is no longer active. Contact ShadesOfGray for current posts and information.

USB i/o very slow

Copying files from an external HDD to another USB source (e.g. flashdrive) slows down my computer to a crawl/freezes it. When this occurs I think the copying process is still going on but goes very slowly.
Another problem is that the power of my external HDD goes off once the PC starts booting Arch. I have to manually pull out the cable and plug it in again. But maybe this is unrelated.
I have no idea how to solve this problem.
Below the output of lspci (if it is of any use)
Thanks in advance!
[bart@ArchPC ~]$ lspci
00:00.0 RAM memory: nVidia Corporation MCP78S [GeForce 8200] Memory Controller (rev a2)
00:01.0 ISA bridge: nVidia Corporation MCP78S [GeForce 8200] LPC Bridge (rev a2)
00:01.1 SMBus: nVidia Corporation MCP78S [GeForce 8200] SMBus (rev a1)
00:01.2 RAM memory: nVidia Corporation MCP78S [GeForce 8200] Memory Controller (rev a1)
00:01.3 Co-processor: nVidia Corporation MCP78S [GeForce 8200] Co-Processor (rev a2)
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00:04.0 USB Controller: nVidia Corporation MCP78S [GeForce 8200] OHCI USB 1.1 Controller (rev a1)
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02:00.0 VGA compatible controller: nVidia Corporation C77 [GeForce 8200] (rev a2)
04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller (rev 12)
[bart@ArchPC ~]$

https://bbs.archlinux.org/viewtopic.php?id=111575
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https://bbs.archlinux.org/viewtopic.php?id=125167
https://bugzilla.kernel.org/show_bug.cgi?id=40262
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Not normally, no. But the NXCam cameras employ yet ANOTHER flavor...non-standard flavor...of AVCHD. This makes importing slow and difficult. I had good luck with clips 5 min or less, but longer...and it would take from 2-5 hours!
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IPad Photo Transfer Very Slow....???

I'm using my IPad as a spare hard drive / memory chip to store all my vacation videos and photos then transfer them all to my PC in one go when I get home - the only (well, the main) problem is that the transfer rate is extremely slow. Is this normal ?
I'm using a macbook pro with USB2 and a fat iPad cable, and transferring in Win7. (Tried image capture in osx, it said "there was a problem" and simply stopped the import part-way through)
My other problem is that all the photos & videos are stored on the ipad in many different directories. If I search for *.jpg or *.mp4 to group-copy all the files, it won't let me copy them.....I have to copy the contents of each directory individually....
There must be a more straightforward / quicker way than this ?

I am not sure where movies shot with camera or video camera go. I am assuming they would all go into the Photos app on the iPad.
Have you tried just syncing your iPad the normal way in OS X?
Normally, if you have photos in the Photos app on iPad, iPhoto in OS X is supposed to open and it will ask you to import the photos to iPhoto from the iPad. I believe the same is true of the video. If video is stored in the Photos App on the iPad, it should sync and copy to the iPhoto app on Mac OS X.
Once imported, you can always access the original by going to your iPhoto library and either copy the data to a new location for editing (if using different photo editor) or for video, copy those to a new location for video editing, say, in iMovie, or some other video editor.
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The iPad is not really meant to be a portable, mass storage HD just to store tons of content for dumping to a computer later.
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Look at ones by Hyper Drive, Seagate or Western Digital.
Anyhoo... Try a normal iPad sync to see if it transfers normally instead of using Image Capture.
See if this works.
And yes, the transfer rate maybe slow, especially if you shot a lot of video and depending on the resolution you shot your photos in.
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USB file copy very slow

Hi everyone, I hope that someone can help me with thisproblem:
I was copying some files of 370 MB to a 4GB Kingston USB key and It took around 45 or 50 minutes to copy it and when I try to eject the key it give me an error. I tried again and it was the same; So I remove it without unmounting...... The result, only two of all files were in the usb key.
I'm using LXDE, 2.6.30-arch on a AMD 5200 x2 64bits, 4 GB of ram.
Why it took me too long to copy those files and the error when i was rejecting the USB key???
Thanks to all, please forgive my english....

brebs wrote:
R00KIE wrote:usb flash drives have an activity led for a reason
It would not be reliable, without the flush option, to prevent excessive caching.
Yes you are right, but if lots of data is cached and you ask to unmount the drive from a DE (my experience is with xfce) then I believe there is a timeout before it spits an error about not being able to unmount while it is still trying to flush out all the data (maybe the error the OP received?), thats when the activity led is useful, to check if it is just being stubborn or actually still doing something.
I have noticed that even after xfce says it is safe to remove the device there is still activity for a couple of seconds so I guess one risks to have data loss if removing the drive while there is still activity.
The OP just said 370 MB of data and didn't mention how many files there were, from my experience you get around 5MB/s of writing speed with most usb flash drives (USB2 drives, the most common and cheaper) but this is when writing big files, try to write 300MB of small files and you will quit before it reaches 20% (if you don't count caching).
I have also noticed that even if the kernel does cache the writes it will keep writing in the background, but when unmounting there is always some writing to do so I guess either way it will not be safe to just remove the drive without unmounting first, that flush mount option may be worth looking at ...
Without more details we are all just giving our best guesses, maybe it can even be broken hardware that is causing the problem for all we know.

Wireless File Transfer VERY Slow

Might not be the right forum but does anyone have any idea how to set up the wireless connection to be very fast? I thought it was something to do the 54mbs?? Is it something I need to change on all the macs?

No b clients just one mac plugged directly into the
router via ethernet cord, and then my powerbook which
connects wirelessy... to copy a 20mb file it took
10mins...
Which router do you have?
iFelix

E3200 USB storage - transfer very slow

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