From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 26 Jul 2005 15:31:38 -0400 From: Sonny Rao Subject: Re: Memory pressure handling with iSCSI Message-ID: <20050726193138.GA32324@kevlar.burdell.org> References: <1122399331.6433.29.camel@dyn9047017102.beaverton.ibm.com> <20050726111110.6b9db241.akpm@osdl.org> <1122403152.6433.39.camel@dyn9047017102.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1122403152.6433.39.camel@dyn9047017102.beaverton.ibm.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Badari Pulavarty Cc: Andrew Morton , lkml , linux-mm List-ID: On Tue, Jul 26, 2005 at 11:39:11AM -0700, Badari Pulavarty wrote: > On Tue, 2005-07-26 at 11:11 -0700, Andrew Morton wrote: > > 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? > > > > > > Well, profile doesn't show any time in "default_idle". So > I believe, vmstat is telling the truth. Badari, You probably covered this, but just to make sure, if you're on a pentium4 machine, I usually boot w/ "idle=poll" to see proper idle reporting because otherwise the chip will throttle itself back and idle time will be skewed -- at least on oprofile. Sonny -- 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