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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=0A=0A--- On Thu, 7/1/10, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote:= =0A=0A> From: Jeremy Chadwick <freebsd@jdc.parodius.com>=0A> Subject: Re: N= FS 75 second stall=0A> To: "alan bryan" <alan.bryan@yahoo.com>=0A> Cc: free= bsd-stable@freebsd.org=0A> Date: Thursday, July 1, 2010, 1:53 PM=0A> On Thu= , Jul 01, 2010 at 11:01:04AM=0A> -0700, alan bryan wrote:=0A> > Setup:=0A> = > =0A> > server - FreeBSD 8-stable from today.=A0 2 UFS dirs=0A> exported v= ia NFS.=0A> > client - FreeBSD 8.0-Release.=A0 Running a test php=0A> scrip= t that copies around various files to/from 2 separate=0A> NFS mounts.=0A> >= =0A> > Situation: =0A> > =0A> > script is started (forked to do 20 simulta= neous runs)=0A> and 20 1GB files are copied to the NFS dir which works=0A> = fine.=A0 When it then switches to reading those files back=0A> and simultan= eously writing to the other NFS mount I see a=0A> hang of 75 seconds.=A0 If= I do an "ls -l" on the NFS mount it=0A> hangs too.=A0 After 75 seconds the= client has reported:=0A> > =0A> > nfs server 192.168.10.133:/usr/local/exp= ort1: not=0A> responding=0A> > nfs server 192.168.10.133:/usr/local/export1= : is alive=0A> again=0A> > nfs server 192.168.10.133:/usr/local/export1: no= t=0A> responding=0A> > nfs server 192.168.10.133:/usr/local/export1: is ali= ve=0A> again =0A> > =0A> > and then things start working again.=A0 The serv= er was=0A> originally FreeBSD 8.0-Release also but was upgraded to the=0A> = latest stable to see if this issue could be avoided.=0A> >=0A> > ...=0A> > = =0A> > Any ideas on what's going on here?=A0 What's=0A> causing the complet= e stall period of zero NFS=0A> activity?=A0=A0=A0Any flaws with my testing= =0A> methods?=0A> =0A> One thing worth asking: are there any firewall stack= s=0A> (ipfw, ipfilter,=0A> or pf) in use on either the client or server?=0A= > =0A> -- =0A> | Jeremy Chadwick=A0 =A0 =A0 =A0 =A0 =A0=0A> =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0=0A> =A0 =A0 =A0=A0=A0jdc@parodius.com=0A> |=0A> | Parodius= Networking=A0 =A0 =A0 =A0 =A0=0A> =A0 =A0 =A0 =A0 =A0 =A0=A0=A0http://www.= parodius.com/ |=0A> | UNIX Systems Administrator=A0 =A0 =A0 =A0=0A> =A0 =A0= =A0 =A0 =A0 Mountain View, CA, USA |=0A> | Making life hard for others sin= ce 1977.=A0 =A0=0A> =A0 =A0 =A0 =A0 =A0 PGP: 4BD6C0CB |=0A> =0A> =0A=0A=0AN= ope, no firewalls - just 2 machines connected directly to a Dell 2716 Gbit = switch.=0A=0AThanks,=0AAlan=0A=0A=0A=0A
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