Date: Mon, 13 Sep 2010 11:15:34 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: freebsd-stable@FreeBSD.ORG, freebsd-fs@FreeBSD.ORG, rmacklem@uoguelph.ca Subject: Re: Why is NFSv4 so slow? Message-ID: <1846953836.819261.1284390934350.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <201009131503.o8DF3Qau039703@lurza.secnetix.de>
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> > Ok ... > > NFS server: > - FreeBSD 8.1-PRERELEASE-20100620 i386 > - intel Atom 330 (1.6 GHz dual-core with HT --> 4-way SMP) > - 4 GB RAM > - re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> > > NFS client: > - FreeBSD 8.1-STABLE-20100908 i386 > - AMD Phenom II X6 1055T (2.8 GHz + "Turbo Core", six-core) > - 4 GB RAM > - re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> > > The machines are connected through a Netgear GS108T > gigabit ethernet switch. > > I umounted and re-mounted the NFS path after every single > dd(1) command, so the data actually comes from the server > instead of from the local cache. I also made sure that > the file was in the cache on the server, so the server's > disk speed is irrelevant. > > Testing with "mount -t nfs": > > 183649990 bytes transferred in 2.596677 secs (70725002 bytes/sec) > 183649990 bytes transferred in 2.578746 secs (71216779 bytes/sec) > 183649990 bytes transferred in 2.561857 secs (71686277 bytes/sec) > 183649990 bytes transferred in 2.629028 secs (69854708 bytes/sec) > 183649990 bytes transferred in 2.535422 secs (72433702 bytes/sec) > > Testing with "mount -t newnfs": > > 183649990 bytes transferred in 5.361544 secs (34253192 bytes/sec) > 183649990 bytes transferred in 5.401471 secs (33999996 bytes/sec) > 183649990 bytes transferred in 5.052138 secs (36350946 bytes/sec) > 183649990 bytes transferred in 5.311821 secs (34573829 bytes/sec) > 183649990 bytes transferred in 5.537337 secs (33165760 bytes/sec) > > So, nfs is roughly twice as fast as newnfs, indeed. > > Best regards > Oliver > Thanks for doing the test. I think I can find out what causes the factor of 2 someday. What is really weird is that some people see several orders of magnitude slower (a few Mbytes/sec). Your case was also useful, because you are using the same net interface/driver as the original report of a few Mbytes/sec, so it doesn't appear to be an re problem. Have a good week, rick
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