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/
This archive was generated by hypermail 2b29 : Tue Oct 31 2000 - 21:00:25 EST