On Sun, Dec 11, 2011 at 12:00:45PM -0800, John Simon wrote: > I recently attached a Solaris 10 8/07 client (6900 with ce gigbit > interface) to our NFS server which runs RHEL 5.5 (kernel > 2.6.18-194.el5). Could you file a bug against Red Hat and/or Solaris? > Performance typically is good running around > 25-50MB/s but sometimes seemingly without reason the performance drops > to abysmal levels and will stay like that until NFS is unmounted and > remounted. I have tested this after hours when there is no load on > either server, no traffic on the network and using a 1GB test file. > Our other 300 Linux clients have no performance issues, I have ruled > out network issues by isolating the server to a switch dedicated to it > and an additional port on the NFS server and the tests I performed > were with the file cache in memory. > > $ time cp /var/tmp/1g.TEST.new /mnt/ real 25m1.456s user > 0m0.276s sys 0m6.699s > > After an unmount, wait 5 minutes and remount: > > $ time cp /var/tmp/1g.TEST.new /mnt/ real 0m26.767s user > 0m0.277s sys 0m6.589s > > Mount options I am using on Solaris: > > Flags: > vers=3,proto=tcp,sec=none,hard,intr,link,symlink,acl,rsize=32768,wsize=32768,retrans=5,timeo=600 > Attr cache: acregmin=120,acregmax=120,acdirmin=120,acdirmax=120 Some ideas: - Anything interesting in the logs on client or server? - If you look at a small part of the network traffic in wireshark, in the bad case, is there any obvious problem? (Lots of retransmissions, errors returned from the server, ?) - Can you get any rpc statistics out of the client? (Average time to respond to an rpc, mix of rpc's sent, etc.?) --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
