From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e35.co.us.ibm.com (8.12.10/8.12.9) with ESMTP id j6QNQShn227620 for ; Tue, 26 Jul 2005 19:26:28 -0400 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VERS6.7) with ESMTP id j6QNQS9v434182 for ; Tue, 26 Jul 2005 17:26:28 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.12.11/8.13.3) with ESMTP id j6QNQSnl008064 for ; Tue, 26 Jul 2005 17:26:28 -0600 Subject: Re: Memory pressure handling with iSCSI From: Badari Pulavarty In-Reply-To: <20050726160728.55245dae.akpm@osdl.org> References: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.com> <20050726111110.6b9db241.akpm@osdl.org> <1122403152.6433.39.camel@dyn9047017102.beaverton.ibm.com> <20050726114824.136d3dad.akpm@osdl.org> <20050726121250.0ba7d744.akpm@osdl.org> <1122412301.6433.54.camel@dyn9047017102.beaverton.ibm.com> <20050726142410.4ff2e56a.akpm@osdl.org> <1122414300.6433.57.camel@dyn9047017102.beaverton.ibm.com> <20050726151003.6aa3aecb.akpm@osdl.org> <1122418089.6433.62.camel@dyn9047017102.beaverton.ibm.com> <20050726160728.55245dae.akpm@osdl.org> Content-Type: text/plain Date: Tue, 26 Jul 2005 16:26:16 -0700 Message-Id: <1122420376.6433.68.camel@dyn9047017102.beaverton.ibm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: lkml , linux-mm List-ID: On Tue, 2005-07-26 at 16:07 -0700, Andrew Morton wrote: > Badari Pulavarty wrote: > > > > Here is the data with 5 ext2 filesystems. I also collected /proc/meminfo > > every 5 seconds. As you can see, we seem to dirty 6GB of data in 20 > > seconds of starting the test. I am not sure if its bad, since we have > > lots of free memory.. > > It's bad. The logic in balance_dirty_pages() should block those write() > callers as soon as we hit 40% dirty memory or whatever is in > /proc/sys/vm/dirty_ratio. So something is horridly busted. > > Can you try reducing the number of filesystems even further? Single ext2 filesystem. We still dirty pretty quickly (data collected every 5 seconds). # grep Dirty OUT Dirty: 312 kB Dirty: 1121852 kB Dirty: 2896952 kB Dirty: 4344564 kB Dirty: 5310856 kB Dirty: 5507812 kB Dirty: 5714884 kB Dirty: 5865132 kB Dirty: 6004276 kB Dirty: 6206544 kB Dirty: 6380524 kB Dirty: 6583200 kB Dirty: 6727296 kB Dirty: 6708564 kB Dirty: 6733768 kB Dirty: 6737868 kB Thanks, Badari -- 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