Date: Thu, 1 Jul 2010 13:59:57 -0700 (PDT) From: alan bryan <alan.bryan@yahoo.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: NFS 75 second stall Message-ID: <173056.89627.qm@web50506.mail.re2.yahoo.com> In-Reply-To: <20100701205350.GA6690@icarus.home.lan>
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--- On Thu, 7/1/10, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > From: Jeremy Chadwick <freebsd@jdc.parodius.com> > Subject: Re: NFS 75 second stall > To: "alan bryan" <alan.bryan@yahoo.com> > Cc: freebsd-stable@freebsd.org > Date: Thursday, July 1, 2010, 1:53 PM > On Thu, Jul 01, 2010 at 11:01:04AM > -0700, alan bryan wrote: > > Setup: > > > > server - FreeBSD 8-stable from today. 2 UFS dirs > exported via NFS. > > client - FreeBSD 8.0-Release. Running a test php > script that copies around various files to/from 2 separate > NFS mounts. > > > > Situation: > > > > script is started (forked to do 20 simultaneous runs) > and 20 1GB files are copied to the NFS dir which works > fine. When it then switches to reading those files back > and simultaneously writing to the other NFS mount I see a > hang of 75 seconds. If I do an "ls -l" on the NFS mount it > hangs too. After 75 seconds the client has reported: > > > > nfs server 192.168.10.133:/usr/local/export1: not > responding > > nfs server 192.168.10.133:/usr/local/export1: is alive > again > > nfs server 192.168.10.133:/usr/local/export1: not > responding > > nfs server 192.168.10.133:/usr/local/export1: is alive > again > > > > and then things start working again. The server was > originally FreeBSD 8.0-Release also but was upgraded to the > latest stable to see if this issue could be avoided. > > > > ... > > > > Any ideas on what's going on here? What's > causing the complete stall period of zero NFS > activity? Any flaws with my testing > methods? > > One thing worth asking: are there any firewall stacks > (ipfw, ipfilter, > or pf) in use on either the client or server? > > -- > | Jeremy Chadwick > > jdc@parodius.com > | > | Parodius Networking > http://www.parodius.com/ | > | UNIX Systems Administrator > Mountain View, CA, USA | > | Making life hard for others since 1977. > PGP: 4BD6C0CB | > > Nope, no firewalls - just 2 machines connected directly to a Dell 2716 Gbit switch. Thanks, Alan
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