Re: Bad performance of 7.0 nfs client with Solaris nfs server

On Feb 20, 2008, at 1:01 PM, Alfred Perlstein wrote:
Take a look at the level of packet fragmentation you are encountering;
yes, this is expected and things will work but there is extra latency
added when the IP stack has to reassemble packets before the data can
be delivered. Try setting the NFS rsize/wsize to 1024 or perhaps 1400
and see whether that improves performance.

Or, if your switch and NICs support it, see whether you can get Gb
Ethernet jumbo frames working so that you don't have to fragment for
2K or 4K data packets....

TCP mounts do not have this problem. You can safely use
32k or higher sizes with TCP without fragmentation.

Oh, sure. But there is a bit more overhead with TCP transport than UDP-- for local (switched) networks, UDP generally seems to be a win...TCP seems to be a better choice over a VPN or some similar kind of WAN.

--
-Chuck

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