From: Ingo Molnar <mingo@elte.hu>
To: Steve Rago <sar@nec-labs.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org,
Trond.Myklebust@netapp.com, Wu Fengguang <fengguang.wu@intel.com>,
"jens.axboe" <jens.axboe@oracle.com>
Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads
Date: Fri, 18 Dec 2009 20:41:29 +0100 [thread overview]
Message-ID: <20091218194129.GB6153@elte.hu> (raw)
In-Reply-To: <1261164799.1947.123.camel@serenity>
* Steve Rago <sar@nec-labs.com> wrote:
> > Also, I don't think this needs to have a sysctl, it should just work.
>
> The sysctl is a *good thing* in that it allows the eager writeback behavior
> to be tuned and shut off if need be. I can only test the changes on a
> finite set of systems, so better safe than sorry.
This issue has been settled many years ago and that's not what we do in the
Linux kernel. We prefer patches to core code where we are reasonably sure they
result in good behavior - and then we fix bugs in the new behavior, if any.
(Otherwise odd sysctls would mushroom quickly and the system would become
untestable in practice.)
Ingo
next prev parent reply other threads:[~2009-12-18 19:41 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-17 2:03 Steve Rago
2009-12-17 8:17 ` Peter Zijlstra
2009-12-18 19:33 ` Steve Rago
2009-12-18 19:41 ` Ingo Molnar [this message]
2009-12-18 21:20 ` Steve Rago
2009-12-18 22:07 ` Ingo Molnar
2009-12-18 22:46 ` Steve Rago
2009-12-19 8:08 ` Arjan van de Ven
2009-12-19 13:37 ` Steve Rago
2009-12-18 19:44 ` Peter Zijlstra
2009-12-19 12:20 ` Wu Fengguang
2009-12-19 14:25 ` Steve Rago
2009-12-22 1:59 ` Wu Fengguang
2009-12-22 12:35 ` Jan Kara
2009-12-23 8:43 ` Christoph Hellwig
2009-12-23 13:32 ` Jan Kara
2009-12-24 5:25 ` Wu Fengguang
2009-12-24 1:26 ` Wu Fengguang
2009-12-22 13:01 ` Martin Knoblauch
2009-12-24 1:46 ` Wu Fengguang
2009-12-22 16:41 ` Steve Rago
2009-12-24 1:21 ` Wu Fengguang
2009-12-24 14:49 ` Steve Rago
2009-12-25 7:37 ` Wu Fengguang
2009-12-23 14:21 ` Trond Myklebust
2009-12-23 18:05 ` Jan Kara
2009-12-23 19:12 ` Trond Myklebust
2009-12-24 2:52 ` Wu Fengguang
2009-12-24 12:04 ` Trond Myklebust
2009-12-25 5:56 ` Wu Fengguang
2009-12-30 16:22 ` Trond Myklebust
2009-12-31 5:04 ` Wu Fengguang
2009-12-31 19:13 ` Trond Myklebust
2010-01-06 3:03 ` Wu Fengguang
2010-01-06 16:56 ` Trond Myklebust
2010-01-06 18:26 ` Trond Myklebust
2010-01-06 18:37 ` Peter Zijlstra
2010-01-06 18:52 ` Trond Myklebust
2010-01-06 19:07 ` Peter Zijlstra
2010-01-06 19:21 ` Trond Myklebust
2010-01-06 19:53 ` Trond Myklebust
2010-01-06 20:09 ` Jan Kara
2009-12-22 12:25 ` Jan Kara
2009-12-22 12:38 ` Peter Zijlstra
2009-12-22 12:55 ` Jan Kara
2009-12-22 16:20 ` Steve Rago
2009-12-23 18:39 ` Jan Kara
2009-12-23 20:16 ` Steve Rago
2009-12-23 21:49 ` Trond Myklebust
2009-12-23 23:13 ` Steve Rago
2009-12-23 23:44 ` Trond Myklebust
2009-12-24 4:30 ` Steve Rago
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