From: Andrew Morton <akpm@linux-foundation.org>
To: Olga Kornievskaia <aglo@citi.umich.edu>
Cc: Jeff Moyer <jmoyer@redhat.com>,
Jens Axboe <jens.axboe@oracle.com>,
linux-kernel@vger.kernel.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
"J. Bruce Fields" <bfields@fieldses.org>,
Jim Rees <rees@umich.edu>,
linux-nfs@vger.kernel.org
Subject: Re: 2.6.30-rc deadline scheduler performance regression for iozone over NFS
Date: Wed, 13 May 2009 09:32:29 -0700 [thread overview]
Message-ID: <20090513093229.097b47d2.akpm@linux-foundation.org> (raw)
In-Reply-To: <b4ff356f0905130920v184ab529mb52a4346d4c77c14-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, 13 May 2009 12:20:57 -0400 Olga Kornievskaia <aglo@citi.umich.edu> wrote:
> I believe what you are seeing is how well TCP autotuning performs.
> What old NFS code was doing is disabling autotuning and instead using
> #nfsd thread to scale TCP recv window. You are providing an example of
> where setting TCP buffer sizes outperforms TCP autotuning. While this
> is a valid example, there is also an alternative example of where old
> NFS design hurts performance.
<scratches head>
Jeff's computer got slower. Can we fix that?
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Olga Kornievskaia <aglo@citi.umich.edu>
Cc: Jeff Moyer <jmoyer@redhat.com>,
Jens Axboe <jens.axboe@oracle.com>,
linux-kernel@vger.kernel.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
"J. Bruce Fields" <bfields@fieldses.org>,
Jim Rees <rees@umich.edu>,
linux-nfs@vger.kernel.org
Subject: Re: 2.6.30-rc deadline scheduler performance regression for iozone over NFS
Date: Wed, 13 May 2009 09:32:29 -0700 [thread overview]
Message-ID: <20090513093229.097b47d2.akpm@linux-foundation.org> (raw)
In-Reply-To: <b4ff356f0905130920v184ab529mb52a4346d4c77c14@mail.gmail.com>
On Wed, 13 May 2009 12:20:57 -0400 Olga Kornievskaia <aglo@citi.umich.edu> wrote:
> I believe what you are seeing is how well TCP autotuning performs.
> What old NFS code was doing is disabling autotuning and instead using
> #nfsd thread to scale TCP recv window. You are providing an example of
> where setting TCP buffer sizes outperforms TCP autotuning. While this
> is a valid example, there is also an alternative example of where old
> NFS design hurts performance.
<scratches head>
Jeff's computer got slower. Can we fix that?
next prev parent reply other threads:[~2009-05-13 16:42 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 14:01 2.6.30-rc deadline scheduler performance regression for iozone over NFS Jeff Moyer
2009-05-08 19:01 ` Andrew Morton
2009-05-11 8:14 ` Jens Axboe
2009-05-11 13:53 ` Jeff Moyer
2009-05-11 16:58 ` Jens Axboe
2009-05-13 3:29 ` Jeff Moyer
2009-05-13 3:44 ` Andrew Morton
2009-05-13 14:58 ` Jeff Moyer
[not found] ` <x49y6t1rqw0.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2009-05-13 16:20 ` Olga Kornievskaia
2009-05-13 16:20 ` Olga Kornievskaia
[not found] ` <b4ff356f0905130920v184ab529mb52a4346d4c77c14-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-05-13 16:32 ` Andrew Morton [this message]
2009-05-13 16:32 ` Andrew Morton
2009-05-13 18:16 ` Olga Kornievskaia
2009-05-13 18:16 ` Olga Kornievskaia
[not found] ` <b4ff356f0905131116o48181ccu4786578cc72c8ceb-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-05-13 19:06 ` Jeff Moyer
2009-05-13 19:06 ` Jeff Moyer
2009-05-13 18:25 ` Jim Rees
2009-05-13 19:45 ` Trond Myklebust
2009-05-13 19:29 ` Jeff Moyer
2009-05-13 23:45 ` Trond Myklebust
[not found] ` <1242258338.5407.244.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-05-14 13:34 ` Jeff Moyer
2009-05-14 13:34 ` Jeff Moyer
2009-05-14 13:34 ` Jeff Moyer
[not found] ` <x49octv7qr8.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2009-05-14 14:33 ` Trond Myklebust
2009-05-14 14:33 ` Trond Myklebust
2009-05-14 14:33 ` Trond Myklebust
[not found] ` <1242311620.6560.14.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-05-14 14:38 ` Jeff Moyer
2009-05-14 14:38 ` Jeff Moyer
2009-05-14 14:38 ` Jeff Moyer
2009-05-14 15:00 ` Jeff Moyer
2009-05-14 15:00 ` Jeff Moyer
2009-05-14 15:00 ` Jeff Moyer
[not found] ` <x49ws8j686r.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2009-05-17 19:10 ` Trond Myklebust
2009-05-17 19:10 ` Trond Myklebust
2009-05-17 19:10 ` Trond Myklebust
2009-05-17 19:12 ` Trond Myklebust
[not found] ` <1242587524.17796.3.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-05-18 14:15 ` Jeff Moyer
2009-05-18 14:15 ` Jeff Moyer
2009-05-18 14:15 ` Jeff Moyer
2009-05-22 23:45 ` J. Bruce Fields
2009-05-14 17:55 ` J. Bruce Fields
2009-05-14 18:26 ` Trond Myklebust
2009-05-14 18:26 ` Trond Myklebust
[not found] ` <1242325569.6560.27.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-05-15 21:37 ` J. Bruce Fields
2009-05-15 21:37 ` J. Bruce Fields
2009-05-15 21:37 ` J. Bruce Fields
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