Slow: Solaris NFS server, SuSE Linux 8.1 client, read
Hi, I've noticed an extremely slow performance of NFS when a SuSE Linux 8.1 client (2.4.19-4GB) reads from a Solaris 7 (5.7 Generic_106541-18) server via NFS. Can anybody confirm the problem or is it specific to my configuration? Typical times for copying a 10 MiB file follow: $ time cp /data/mr/genesis/amfile . real 0m27.582s user 0m0.010s sys 0m0.060s $ time rcp cobra:/data/mr/genesis/amfile . real 0m1.005s user 0m0.010s sys 0m0.060s The speed is approximately 10 MiB/s via rsh but only 371 KiB/s via NFS. 371 KiB/s is far too slow for a 100 Mb/s TP Ethernet network. I've experimented with mount parameters (e.g. rsize=8192, wsize=8192, nfsvers=2) but without any significant improvement. I don't remember NFS was a bottleneck when SuSE Linux 7.3 was installed on the client. I still keep the old 7.3 so I can do some comparisons later. -- Alexandr.Malusek@imv.liu.se
Hi Alexander,
I've noticed an extremely slow performance of NFS when a SuSE Linux 8.1 client (2.4.19-4GB) reads from a Solaris 7 (5.7 Generic_106541-18) server via NFS. Can anybody confirm the problem or is it specific to my configuration?
try to put in your /etc/auto.home user -rw,rsize=32768,wsize=32768 machine:/export/dir/user ^^^^^^^^^^^^^^^^^^^^^^^^^^^ These options increases the buffer to the size of Solaris buffers. Also watch your traffic in the net and, the last but no the least, check your wires. Sometimes, with high traffic deffective wires show up -- [--------------------------------------------------------------------] [ Prof. Andres Augusto Nogueiras Melendez ] [ Departamento de Tecnologia Electronica - Universidad de Vigo ] [ Campus Lagoas Marcosende, 9 http://www.dte.uvigo.es ] [ 36280 - Vigo, Pontevedra mailto:andres.nogueiras@dte.uvigo.es ] [ Spain tel: +34 986 812 091 fax: +34 986 469 547 ] [--------------------------------------------------------------------]
"Andrés A. Nogueiras Meléndez"
I've noticed an extremely slow performance of NFS when a SuSE Linux 8.1 client (2.4.19-4GB) reads from a Solaris 7 (5.7 Generic_106541-18) server via NFS. Can anybody confirm the problem or is it specific to my configuration?
try to put in your /etc/auto.home
user -rw,rsize=32768,wsize=32768 machine:/export/dir/user ^^^^^^^^^^^^^^^^^^^^^^^^^^^
These options increases the buffer to the size of Solaris buffers.
I've changed the mount parameters to rw, rsize=32768, wsize=32768 but the performance hasn't improved. Actually, it started to fluctuate, sometimes I got the transfer speed 320 KiB/s, sometimes 780 KiB/s. I shortly looked into the tcpdump file I took. Most of the time the packets were sent with the maximum speed but often when there was a multicast (ALL-ROUTERS.MCAST.NET record) the NFS transfer was interrupted for approximately 1s (sometimes more). There were about 20 multicasts in the dump so they might account for the extremely long transfer time (about 30s instead of 1s for 10 MiB file). To be sure, a time analysis of the tcpdump file must be performed. Are there any tools? Anyway, it would be helpful to know that someone has a well performing NFS with a SuSE 8.1 client and a Solaris server (i.e. transfer speeds at least 5 MiB/s.)
Also watch your traffic in the net and, the last but no the least, check your wires. Sometimes, with high traffic deffective wires show up
rcp is not affected by those multicasts and I'm almost sure NFS performance was quite good in SuSE 7.3 (2.4.16 kernel). Thus I think the problem is more software than hardware specific. -- Alexandr.Malusek@imv.liu.se
participants (2)
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Alexandr Malusek -
Andrés A. Nogueiras Meléndez