Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: [linux-usb-devel] System stalls using usb-storage | Date | Sun, 27 Jul 2003 08:24:44 +0200 |
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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.
> 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.
Regards Oliver
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