File transfer to USB key too slow in Karmic.

[StuartN]

I've got the same issue. Sandisk Cruzer 8GB won't let me transfer any larger 100MB+ files without slowing to a crawl.

Buy another brand of USB flash memory.

The Sandisk Cruzer, and any other USB flash drive with U3 hardware, is just not worth the bother. There is a hardware CDROM emulation as part of the (Windows only) password mechanism, which seems to cause timing errors and remounts. Have a look in dmesg when a long copy either slows or fails.

See also http://ubuntuforums.org/showthread.php?t=1351452

[raygj]

this might be worth a try
http://ubuntuforums.org/showpost.php...9&postcount=63

[glasabri]

Excellent ! I like it very much






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[Primefalcon]

Having the same issue myself, extrememly slow transfer speed

[detroit/zero]

You're not dreaming, and this issue for Ubuntu is as old as 8.04 Hardy Heron. If you search here (or Google) for slow usb file transfers, you'll come up with a bunch of my posts. I have cheap USB sticks, more high-end ones, external hard disks, you name it - it's the same on all of them.

I've been all over hell's half acre and back trying to fix this bug, and the closest I can come is to change the kernel I/O scheduler for the drive. I have a small write-up I did here, though the steps will have changed for editing the elevator string in the new Grub menu.

Try it out and post back if you noticed any effect on your transfer speeds.

[berte]

I've got the same issue. Sandisk Cruzer 8GB won't let me transfer any larger 100MB+ files without slowing to a crawl.

Exact same issue here!

[nhasian]

this issue is not limited to flash memory. I have 3 separate external USB 2.0 hard disks and copy files to them are VERY slow. one is a 2.5" and the other two are 7200 RPM 3.5" drives. I get really slow file transfers of about 6 MB/sec.

uname -a says:

Linux Ubuntu 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009 x86_64 GNU/Linux


also when doing a file copy my entire system slows to a crawl. i have a dual 2.4Ghz intel cpu with 2 gigs of ram.

[jmpmjmpm]

yup have this problem too. Absolutely pathetic it has been around for so long and not fixed!

[theBishop]

I'm having the problem with karmic 64-bit. Did not notice it on previous versions.

Really annoying. I'll dmesg or lspci whatever is necessary if it will help.

[Myxb]

I have had the speed problem with my 120G external USB hard drive. Everything I tried (cp, Nautilus, rsync, mc, remounting with 'async') resulted in a peak initial speed of up to 43 Mb/sec with a later drop to about 2-3 Mb/s. I copied a 31G file. The "crawling" part of the copying started on, roughly, the 2nd G. Also the 'system load' would max out until the system would lose much of its responsiveness.

Then installed the 'mainline' kernel from http://kernel.ubuntu.com/~kernel-ppa...ine/v2.6.32.2/ and this disgrace of a speed is gone!

Now the speed looks roughly as this. It starts with ~21 Mb/s then grows to about 40 Mb/s. Then it drops slowly to about 20-23 Mb/s and stays at that level. Actually is continues to drop, but it is probably due to the target drive geometry (?). The actual speed dropped from 23.6 Mb/s at 10% to 19.5 Mb/s at 100% of the 31G file. The 'system load' as seen in gnome system monitor would not grow and stays here on 2-2.16 points.

So the problem is the Ubuntu 2.6.31 kernel itself, in the 2.6.32.2 the problem is gone.

Hope this will help.