Messages in this thread | | | Date | Thu, 01 Sep 2005 16:12:05 -0400 | From | Bill Davidsen <> | Subject | Re: USB Storage speed regression since 2.6.12 |
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DervishD wrote: > Hi all :) > > I don't know if this is a known issue, but usb-storage speed for > 'Full speed' devices dropped from 2.6.11.12 (more than 800Kb/s) to > 2.6.12 (less than 250Kb/s). The problem still exists in 2.6.13. > > The lack of speed seems to affect only the OHCI driver. My test > was done over a PCI USB 2.0 card, ALi chipset, OHCI driver (well > EHCI+OHCI) and using a full speed device capable of 12MBps. The > average measured speeds are: > > - 2.4.31: about 450Kb/seg > - 2.6.11-Debian: about 800Kb/seg > - 2.6.11.12: about 820Kb/seg > - 2.6.12.x: about 200Kb/seg > - 2.6.13: about 200Kb/seg > > The .config is more or less the same in all kernels. I've took a > look at the ChangeLog for 2.6.12 and there are lots of changes in the > USB subsystem but I cannot identify which one could be the culprit. > I see a worse problem, I load the driver, mount the filesystems on the USB 160GB disk, and the disk just "goes away." I see the devices in /proc/scsi/scsi but I can't access the devices any more. Definitely time for a fallback to a more stable kernel! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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