Hi,
starting with 5.4.188 wie see a massive performance regression on our
nfs-server. It basically is serving requests very very slowly with cpu
utilization of 100% (with 5.4.187 and earlier it is 10%) so that it is
unusable as a fileserver.
The culprit are commits (or one of it):
c32f1041382a88b17da5736886da4a492353a1bb "nfsd: cleanup
nfsd_file_lru_dispose()"
628adfa21815f74c04724abc85847f24b5dd1645 "nfsd: Containerise filecache
laundrette"
(upstream 36ebbdb96b694dd9c6b25ad98f2bbd263d022b63 and
9542e6a643fc69d528dfb3303f145719c61d3050)
If I revert them in v5.4.192 the kernel works as before and performance
is ok again.
I did not try to revert them one by one as any disruption of our
nfs-server is a severe problem for us and I'm not sure if they are
related.
5.10 and 5.15 both always performed very badly on our nfs-server in a
similar way so we were stuck with 5.4.
I now think this is because of 36ebbdb96b694dd9c6b25ad98f2bbd263d022b63
and/or 9542e6a643fc69d528dfb3303f145719c61d3050 though I didn't tried to
revert them in 5.15 yet.
Regards,
--
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
