From: Greg Banks <gnb-cP1dWloDopni96+mSzHFpQC/G2K4zDHf@public.gmane.org>
To: Bernd Schubert <bs-PKu+Ek1N2UGzQB+pC5nmwQ@public.gmane.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
Neil Brown <neilb@suse.de>,
Michael Shuey <shuey-olO2ZdjDehc3uPMLIKxrzw@public.gmane.org>,
Shehjar Tikoo <shehjart-YbfuJp6tym7X/JP9YwkgDA@public.gmane.org>,
linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org,
rees@citi.umich.edu, aglo@citi.umich.edu
Subject: Re: high latency NFS
Date: Mon, 04 Aug 2008 19:25:54 +1000 [thread overview]
Message-ID: <4896CB22.4000005@melbourne.sgi.com> (raw)
In-Reply-To: <200808041118.19743.bs-PKu+Ek1N2UGzQB+pC5nmwQ@public.gmane.org>
Bernd Schubert wrote:
> On Monday 04 August 2008 03:11:58 J. Bruce Fields wrote:
>
>> OK, so to summarize: when the rate of incoming rpc's is very high (and,
>> I guess, when we're serving everything out of cache and don't have IO
>> wait), all the nfsd threads will stay runable all the time. That keeps
>> userspace processes from running (possibly for "minutes"). And that's a
>> problem even on a server dedicated only to nfs, since it affects portmap
>> and rpc.mountd.
>>
>
> Even worse, it affects user space HA software such as heartbeat and everyone
> with reasonable timeouts will see spurious 'failures'.
>
We're seeing that problem right now, even with the patch.
--
Greg Banks, P.Engineer, SGI Australian Software Group.
The cake is *not* a lie.
I don't speak for SGI.
WARNING: multiple messages have this Message-ID (diff)
From: Greg Banks <gnb@melbourne.sgi.com>
To: Bernd Schubert <bs@q-leap.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
Neil Brown <neilb@suse.de>, Michael Shuey <shuey@purdue.edu>,
Shehjar Tikoo <shehjart@cse.unsw.edu.au>,
linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org,
rees@citi.umich.edu, aglo@citi.umich.edu
Subject: Re: high latency NFS
Date: Mon, 04 Aug 2008 19:25:54 +1000 [thread overview]
Message-ID: <4896CB22.4000005@melbourne.sgi.com> (raw)
In-Reply-To: <200808041118.19743.bs@q-leap.de>
Bernd Schubert wrote:
> On Monday 04 August 2008 03:11:58 J. Bruce Fields wrote:
>
>> OK, so to summarize: when the rate of incoming rpc's is very high (and,
>> I guess, when we're serving everything out of cache and don't have IO
>> wait), all the nfsd threads will stay runable all the time. That keeps
>> userspace processes from running (possibly for "minutes"). And that's a
>> problem even on a server dedicated only to nfs, since it affects portmap
>> and rpc.mountd.
>>
>
> Even worse, it affects user space HA software such as heartbeat and everyone
> with reasonable timeouts will see spurious 'failures'.
>
We're seeing that problem right now, even with the patch.
--
Greg Banks, P.Engineer, SGI Australian Software Group.
The cake is *not* a lie.
I don't speak for SGI.
next prev parent reply other threads:[~2008-08-04 9:33 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 17:11 high latency NFS Michael Shuey
[not found] ` <200807241311.31457.shuey-olO2ZdjDehc3uPMLIKxrzw@public.gmane.org>
2008-07-30 19:21 ` J. Bruce Fields
2008-07-30 19:21 ` J. Bruce Fields
2008-07-30 21:40 ` Shehjar Tikoo
2008-07-30 21:40 ` Shehjar Tikoo
2008-07-31 2:35 ` Michael Shuey
[not found] ` <200807302235.50068.shuey-olO2ZdjDehc3uPMLIKxrzw@public.gmane.org>
2008-07-31 3:15 ` J. Bruce Fields
2008-07-31 3:15 ` J. Bruce Fields
2008-07-31 7:03 ` Neil Brown
2008-07-31 7:03 ` Neil Brown
[not found] ` <18577.25513.494821.481623-wvvUuzkyo1EYVZTmpyfIwg@public.gmane.org>
2008-08-01 7:23 ` Dave Chinner
2008-08-01 7:23 ` Dave Chinner
2008-08-01 19:15 ` J. Bruce Fields
2008-08-01 19:15 ` J. Bruce Fields
2008-08-04 0:32 ` Dave Chinner
2008-08-04 0:32 ` Dave Chinner
2008-08-04 1:11 ` J. Bruce Fields
2008-08-04 1:11 ` J. Bruce Fields
2008-08-04 2:14 ` Dave Chinner
2008-08-04 2:14 ` Dave Chinner
2008-08-04 9:18 ` Bernd Schubert
2008-08-04 9:18 ` Bernd Schubert
[not found] ` <200808041118.19743.bs-PKu+Ek1N2UGzQB+pC5nmwQ@public.gmane.org>
2008-08-04 9:25 ` Greg Banks [this message]
2008-08-04 9:25 ` Greg Banks
2008-08-04 1:29 ` NeilBrown
2008-08-04 1:29 ` NeilBrown
[not found] ` <52873.192.168.1.70.1217813385.squirrel-eq65iwfR9nKIECXXMXunQA@public.gmane.org>
2008-08-04 6:42 ` Greg Banks
2008-08-04 6:42 ` Greg Banks
[not found] ` <4896A4EE.9030706-cP1dWloDopni96+mSzHFpQC/G2K4zDHf@public.gmane.org>
2008-08-04 19:07 ` J. Bruce Fields
2008-08-04 19:07 ` J. Bruce Fields
2008-08-05 10:51 ` Greg Banks
2008-08-05 10:51 ` Greg Banks
2008-08-01 19:23 ` J. Bruce Fields
2008-08-01 19:23 ` J. Bruce Fields
2008-08-04 0:38 ` Dave Chinner
2008-08-04 0:38 ` Dave Chinner
2008-08-04 8:04 ` Greg Banks
2008-08-04 8:04 ` Greg Banks
2008-07-31 0:07 ` Lee Revell
2008-07-31 18:06 ` Enrico Weigelt
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