On 09/26/09 18:42, Dmitri Vorobiev wrote:
> Hello,
>
> We tried to use an emulated USB Mass Storage device with my QEMU-emulated
> system (Debian GNU/Linux, MIPS architecture, but the same problem is
> present also for a similar x86 version). fdisk(1) works fine. However,
> when formatting is going on or a big file is being copied into the
> USB-MS partition, some errors occur and the system starts working
> extremely slowly.

qemu emulates usb 1.1, which *is* slow.

Attached patch gets usb-storage going for me, but I'd classify it as 
'hack', not as 'fix'.  Fixing it for real would be adding usb 2.0 supprt 
to qemu.  Or fix the linux kernel to deal with usb 1.1 more sanely, 
which is probably just adjusting the scsi timeouts to the device speed ...

cheers,
   Gerd