On Sun, Jul 27, 2003 at 08:24:44AM +0200, Oliver Neukum wrote: > Am Donnerstag, 24. Juli 2003 05:00 schrieb Matthew Dharm: > > Many people, including myself, have observed system stalls when using > > usb-storage. It happens when copying large amounts of data to a USB device > > -- everything (except the USB access) just stops for a little while. My > > best guess is that the block cache is filling up (easy since USB is so > > slow). > > Can you do a vmstat run? That should provide conclusive data. > If so, write throteling is failing.
I'll set up some tests and get back to you...
> > The question is, what is the best way to handle this. I'm guessing that
> > increasing the priority of the usb-storage control thread will help, but
> > that's just a guess. I'm not even sure how to go about doing that, tho...
>
> A kernel thread in the block io path has to have a higher priority than
> any user task. Otherwise a priority inversion is possible.
Reasonable. So, other than renice at the command line, how does one go
about setting this?
Matt
--
Matthew Dharm Home: [EMAIL PROTECTED]
Maintainer, Linux USB Mass Storage Driver
Somebody call an exorcist!
-- Dust Puppy
User Friendly, 5/16/1998
pgp00000.pgp
Description: PGP signature
