[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

Hated On Mostly mostly.hated.on at gmail.com
Mon Oct 19 06:40:45 UTC 2009


If people could post whether or not CFQ is enabled and whether they
still have the slow usb problem that would be great info:

-------------
http://www.cyberciti.biz/faq/linux-change-io-scheduler-for-harddisk/

Task: View Current Disk scheduler

Assuming that your disk name /dev/sda, type in a terminal:

cat /sys/block/sda/queue/scheduler

--------

Copy and paste the output of the above command.

My system shows:

noop anticipatory [deadline] cfq

Which means my system (9.10 Karmic Koala beta with no updates) is using
deadline by default and I am currently not experiencing the problem. I
was experiencing the slow USB transfer speeds in 8.04 Hardy Heron and
8.10 Intrepid Ibex.

-- 
ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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