I want to confirm the problem and add some info that I did not see here:
1 - Problem occurs not only with usb/ehci-hcd, using a internal card reader
(sdhci-pci) results in same slowdown
2 - It is not dependent on file-system: same speed with ext3 or vfat
3 - The problem is random, sometimes it is very slow (< 1MB/s) and sometimes
just slow (~2 MB/s)
4 - Using pci=routeirq AND noapic seems to increase speed a for smaller files
(10MB/s with a 300MB file and 1MB/s with a 700MB file)
4.1) I tried both boot configs separated and nothing changed
4.2) I did not repeat tests extensively to be sure this is a consistent or
random behavior
5 - No relevant dmesg messages loading modules and during or after transfer
I don't know how those data transfers are ran by the kernel, but it
seems to be a very low-level problem.
My system:
$ uname -a
Linux xxx 2.6.27-10-generic #1 SMP Fri Nov 21 19:19:18 UTC 2008 x86_64 GNU/Linux
The hardware is a ATI SB600 for USB and Ricoh R5C822 for card readers.
I can supply any other info you need and if there is a way to debug
this, just give me some guidance and I can do this job...
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file transfer on USB disk slows down with gvfs
https://bugs.launchpad.net/bugs/197762
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