Bad performance of 7.0 nfs client with Solaris nfs server

[Alfred Perlstein]

* Chuck Swiger <cswiger at mac.com> [080220 10:35] wrote:
> Hi--
> 
> On Feb 20, 2008, at 3:23 AM, Valerio Daelli wrote:
> >	99904 total packets received
> [ ... ]
> >
> >	61441 fragments received
> 
> [ ... ]
> >	34819 output datagrams fragmented
> >	208914 fragments created
> 
> 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.

-Alfred