From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 23 Feb 2004 11:42:33 -0800 From: Andrew Morton Subject: Re: LTP VM test slower under 2.6.3 than 2.4.20 Message-Id: <20040223114233.6ed4eded.akpm@osdl.org> In-Reply-To: <403A2F89.4070405@movaris.com> References: <40363778.20900@movaris.com> <20040222231903.5f9ead5c.akpm@osdl.org> <403A2F89.4070405@movaris.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Kirk True Cc: kernelnewbies@nl.linux.org, Linux-MM@kvack.org List-ID: Kirk True wrote: > > Hi Andrew, > > > I'd be wondering if your disk system is correctly running in DMA mode. > > Apparently support for my hardware isn't magically preset in 2.6.3 as it > was somehow in 2.4. After including it in the kernel the values returned > by hdparm -Tt /dev/hda/ were sped up by a factor of 10! Thanks! > > But... > > > On my 256MB test box, mem01 takes 31 seconds under 2.4.25, 25 seconds > > under 2.6.3-mm3. > > ...I'm still seeing a factor of two speed slowdown between 2.4.20 and > 2.6.3. Would it help to do a vmstat log/graph for the new results? > Try 2.6.3-mm3. It's tons better at this. -- 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: aart@kvack.org