From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 28 Jul 2001 10:40:30 -0300 (BRT) From: Marcelo Tosatti Subject: Re: 2.4.8-pre1 and dbench -20% throughput In-Reply-To: <01072805183900.00293@starship> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Daniel Phillips Cc: linux-mm@kvack.org, Steven Cole , Roger Larsson List-ID: On Sat, 28 Jul 2001, Daniel Phillips wrote: > On Saturday 28 July 2001 01:43, Roger Larsson wrote: > > Hi again, > > > > It might be variations in dbench - but I am not sure since I run > > the same script each time. > > I believe I can reproduce the effect here, even with dbench 2. So the > next two steps: > > 1) Get some sleep > 2) Find out why I would suggest getting the SAR patch to measure amount of successful request merges and compare that between the different kernels. It sounds like the test being done is doing a lot of contiguous IO, so increasing readahead also increases throughtput. -- 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/