Comment 565 for bug 88746

Revision history for this message
Stefano_PG (slot) wrote : Re: [Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

I tested a transfer from sda (ide) to sdb (Usb) of an iso (700mb).
The worst for me is the deadline, wich is about 0.5MB/s slower than cfq.
Anticipatory is about 0.7MB/s faster.
At the end I stay with cfq.

Il 19/10/2009 08:40, Hated On Mostly ha scritto:
> 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.
>
>