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
