Messages in this thread |  | | Date | Sun, 29 Oct 2000 14:45:43 -0800 | From | Jens Axboe <> | Subject | Re: Blocked processes <=> Elevator starvation? |
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On Sun, Oct 29 2000, Miles Lane wrote: > >> There were still some stalls but they only lasted a couple of > >> seconds. The patch did make a difference and for the better. > > > > > > Ok, still needs a bit of work. Thanks for the feedback. > > Have you resolved this problem completely, now? > > I am testing the USB Storage support with my ORB backup > drive. When I run: > > dd if=/dev/zero of=/dev/sda bs=1k count=2G > > The drive gets data quickly for about thirty seconds. > Then the throughput drops off to about ten percent > of its previous transfer rate. This dropoff appears to > be due to conflict over accessing filesystems. Specifically, > I have USB_STORAGE_DEBUG enabled, which shoots a ton of > debugging output into my kernel log. When the throughput > to the ORB drive falls off, all writing to the syslog > ceases. At least, that's what "tail -f" shows. > > I would be happy to test any patches you have for this > problem.
Could you send vmstat 1 info from the start of the copy and until the i/o rate drops off?
-- * Jens Axboe <axboe@suse.de> * SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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