From: David Miller <davem@davemloft.net>
To: lwoodman@redhat.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: RFC: dirty_ratio back to 40%
Date: Thu, 20 May 2010 23:18:03 -0700 (PDT) [thread overview]
Message-ID: <20100520.231803.168054302.davem@davemloft.net> (raw)
In-Reply-To: <4BF51B0A.1050901@redhat.com>
From: Larry Woodman <lwoodman@redhat.com>
Date: Thu, 20 May 2010 07:20:42 -0400
> Increasing the dirty_ratio to 40% will regain the performance loss
> seen in several benchmarks. Whats everyone think about this???
I've been making this change via sysctl on every single system I have,
and have been doing so for quite some time.
When doing a lot of GIT operations to a non-SSD disk the kernel simply
can't submit the writes early enough to prevent everything getting
backlogged, and then processes pile up being forced to sleep on I/O
for several seconds at a time.
I therefore totally support making this the default, but I know some
people will be against it :-)
Acked-by: David S. Miller <davem@davemloft.net>
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next prev parent reply other threads:[~2010-05-21 6:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 11:20 RFC: dirty_ratio back to 40% Larry Woodman
2010-05-20 12:29 ` Heinz Diehl
2010-05-20 13:47 ` Richard Kennedy
2010-05-20 23:48 ` KOSAKI Motohiro
2010-05-21 0:48 ` Zan Lynx
2010-05-21 1:11 ` KOSAKI Motohiro
2010-05-21 16:00 ` Jan Kara
2010-05-24 19:50 ` Ric Wheeler
2010-05-21 15:50 ` Jan Kara
2010-05-21 6:18 ` David Miller [this message]
2010-06-08 18:49 ` Christoph Hellwig
2010-06-08 19:01 ` Larry Woodman
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