Messages in this thread | | | From | Andrew Theurer <> | Subject | Re: [NFS] Re: [PATCH] zerocopy NFS for 2.5.36 | Date | Tue, 22 Oct 2002 16:16:23 -0500 |
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On Saturday 19 October 2002 15:34, Hirokazu Takahashi wrote: > Hello, > > > > Congestion avoidance mechanism of NFS clients might cause this > > > situation. I think the congestion window size is not enough > > > for high end machines. You can make the window be larger as a > > > test. > > > > Is this a concern on the client only? I can run a test with just one > > client and see if I can saturate the 100Mbit adapter. If I can, would we > > need to make any adjustments then? FYI, at 115 MB/sec total throughput, > > that's only 2.875 MB/sec for each of the 40 clients. For the TCP result > > of 181 MB/sec, that's 4.525 MB/sec, IMO, both of which are comfortable > > throughputs for a 100Mbit client. > > I think it's a client issue. NFS servers don't care about cogestion of UDP > traffic and they will try to response to all NFS requests as fast as they > can. > > You can try to increase the number of clients or the number of mount points > for a test. It's easy to mount the same directory of the server on some > directries of the client so that each of them can work simultaneously. > # mount -t nfs server:/foo /baa1 > # mount -t nfs server:/foo /baa2 > # mount -t nfs server:/foo /baa3
I don't think it is a client congestion issue at this point. I can run the test with just one client on UDP and achieve 11.2 MB/sec with just one mount point. The client has 100 Mbit Ethernet, so should be the upper limit (or really close). In the 40 client read test, I have only achieved 2.875 MB/sec per client. That and the fact that there are never more than 2 nfsd threads in a run state at one time (for UDP only) leads me to believe there is still a scaling problem on the server for UDP. I will continue to run the test and poke a prod around. Hopefully something will jump out at me. Thanks for all the input!
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