Yes! Thank you.
On Mon, 12 Jul 2021 at 18:27, Jan Kara <jack@xxxxxxx> wrote:
On Fri 09-07-21 15:19:17, Michael Stapelberg wrote:
> Thanks for sending this patch series!
>
> I have used the mmap.c reproducer as before, with the following parameters:
> * mkdir /tmp/mnt
> * fusermount -u /tmp/mnt; /root/fuse-2.9.9/example/fusexmp_fh -f /tmp/mnt
> * dd if=/dev/urandom of=/tmp/was bs=1M count=99
> * while :; do grep ^Bdi /sys/kernel/debug/bdi/0:44/stats; sleep 0.1; done
> * while :; do time WORKAROUND=1 ~/mmap /tmp/was
> /tmp/mnt/tmp/stapelberg.1; sleep 5; done
>
> Previously, after a few iterations, the BdiWriteBandwidth measure
> would gradually approach 0.
>
> With your patch series applied, the BdiWriteBandwidth is updated much
> more quickly, and converges to ≈16000 kBps.
> When I start copying more quickly, the bandwidth measure rises quickly.
>
> As far as I understand, this should fix the problem (provided 16000
> kBps is an okay value).
> Certainly, I don’t see the downward spiral either with your patches :)
Thanks for testing! Can I add your Tested-by tag?
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
