From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: blk_congestion_wait racy? Message-ID: From: Martin Schwidefsky Date: Thu, 11 Mar 2004 20:04:21 +0100 MIME-Version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 8BIT Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, piggin@cyberone.com.au List-ID: > Yes, sorry, all the world's an x86 :( Could you please send me whatever > diffs were needed to get it all going? I am just preparing that mail :-) > I thought you were running a 256MB machine? Two seconds for 400 megs of > swapout? What's up? Roughly 400 MB of swapout. And two seconds isn't that bad ;-) > An ouch-per-second sounds reasonable. It could simply be that the CPUs > were off running other tasks - those timeout are less than scheduling > quanta. I don't understand why an ouch-per-second is reasonable. The mempig is the only process that runs on the machine and the blk_congestion_wait uses HZ/10 as timeout value. I'd expect about 100 ouches for the 10 seconds the test runs. The 4x performance difference remains not understood. blue skies, Martin Linux/390 Design & Development, IBM Deutschland Entwicklung GmbH Schonaicherstr. 220, D-71032 Boblingen, Telefon: 49 - (0)7031 - 16-2247 E-Mail: schwidefsky@de.ibm.com -- 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