Date: Wed, 9 Mar 2022 03:46:01 -0500 From: Yoshihiro Ota <ota@j.email.ne.jp> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: nfsd becomes slow when machine CPU usage is at or over 100% on STABLE/13 Message-ID: <20220309034601.ea3135e31aec3ffb2623f145@j.email.ne.jp>
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Hi, I'm on stable/13 with latest code base. I started testing pre-13.1 branch. I noticed major performance degrades with NFS when all CPUs are fully utilized. This happends with stable/13 but not releng/13.0 nor releng/12.3. I had NFS server with above versions and rsynced nfs mount to ufs mount on NFS clients. My NFS server has 4 cores. When I had load average of 3 with make buildworld -j3, NFS server was fine. After adding another 1 load, NFS server throughput came down to about 10% of before. After taking back to 3 load avg, performance recovered and down again after getting over 4. Disk was fully avaiable for rsync; buildworld was done on another disk. Someone told me his smbfs was also slow and he suspected TCP/IP regression instead of NFS, by the way. Hiro
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