From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id C93C46002CC for ; Fri, 21 May 2010 02:17:54 -0400 (EDT) Date: Thu, 20 May 2010 23:18:03 -0700 (PDT) Message-Id: <20100520.231803.168054302.davem@davemloft.net> Subject: Re: RFC: dirty_ratio back to 40% From: David Miller In-Reply-To: <4BF51B0A.1050901@redhat.com> References: <4BF51B0A.1050901@redhat.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: lwoodman@redhat.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: From: Larry Woodman 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org