From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262006AbVGZSQv (ORCPT ); Tue, 26 Jul 2005 14:16:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261998AbVGZSOe (ORCPT ); Tue, 26 Jul 2005 14:14:34 -0400 Received: from smtp.osdl.org ([65.172.181.4]:33673 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S262006AbVGZSMX (ORCPT ); Tue, 26 Jul 2005 14:12:23 -0400 Date: Tue, 26 Jul 2005 11:11:10 -0700 From: Andrew Morton To: Badari Pulavarty Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: Memory pressure handling with iSCSI Message-Id: <20050726111110.6b9db241.akpm@osdl.org> In-Reply-To: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.com> References: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.com> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Badari Pulavarty wrote: > > After KS & OLS discussions about memory pressure, I wanted to re-do > iSCSI testing with "dd"s to see if we are throttling writes. > > I created 50 10-GB ext3 filesystems on iSCSI luns. Test is simple > 50 dds (one per filesystem). System seems to throttle memory properly > and making progress. (Machine doesn't respond very well for anything > else, but my vmstat keeps running - 100% sys time). It's important to monitor /proc/meminfo too - the amount of dirty/writeback pages, etc. btw, 100% system time is quite appalling. Are you sure vmstat is telling the truth? If so, where's it all being spent? From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 26 Jul 2005 11:11:10 -0700 From: Andrew Morton Subject: Re: Memory pressure handling with iSCSI Message-Id: <20050726111110.6b9db241.akpm@osdl.org> In-Reply-To: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.com> References: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.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: Badari Pulavarty Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: Badari Pulavarty wrote: > > After KS & OLS discussions about memory pressure, I wanted to re-do > iSCSI testing with "dd"s to see if we are throttling writes. > > I created 50 10-GB ext3 filesystems on iSCSI luns. Test is simple > 50 dds (one per filesystem). System seems to throttle memory properly > and making progress. (Machine doesn't respond very well for anything > else, but my vmstat keeps running - 100% sys time). It's important to monitor /proc/meminfo too - the amount of dirty/writeback pages, etc. btw, 100% system time is quite appalling. Are you sure vmstat is telling the truth? If so, where's it all being spent? -- 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