Date: Tue, 19 Apr 2005 08:30:04 -0500 From: Eric Anderson <anderson@centtech.com> To: Claus Guttesen <kometen@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: some simple nfs-benchmarks on 5.4 RC2 Message-ID: <426507DC.50409@centtech.com> In-Reply-To: <b41c755205041906145fc4719c@mail.gmail.com> References: <b41c75520504190418308f94cc@mail.gmail.com> <4264EC60.3020600@centtech.com> <b41c75520504190443187617de@mail.gmail.com> <4264EF40.3060900@centtech.com> <b41c75520504190455542071f7@mail.gmail.com> <4264F8A8.3080405@centtech.com> <b41c755205041906145fc4719c@mail.gmail.com>
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Claus Guttesen wrote: >>What does gstat look like on the server when you are doing this? >>Also - does a dd locally on the server give the same results? You should get >>about double that I would estimate locally direct to disk. What about a dd over >>NFS? > > > dd-command: > > dd if=/dev/zero of=/nfssrv/dd.tst bs=1024 count=1048576 > > on client: > 1073741824 bytes transferred in 24.787112 secs (43318553 bytes/sec) > gstat showed approx. 30.000-52.000 KB/s. > > on nfs-server: > 1073741824 bytes transferred in 23.368815 secs (45947637 bytes/sec) > gstat showed approx. 45.000-46.000 KB/s. > > The funny thing is that the outputrate fluxuates more dd'ing from the > client (remote) and is more consistent dd'ing on the server (locally). > > >>What is the server spending its time doing? (top?) > > > nfsd. > > >>If you are looking for the best performance, you might try a RAID 0+1 (or 10 >>possibly) instead of RAID 5. > > > I chosed raid 5 to maximize space. What state is nfsd in? Can you send the output of this: ps -auxw|grep nfsd while the server is slammed? I think you are disk bound.. You should not be disk bound at this point with a good RAID controller.. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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