Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 19 Nov 2001 14:30:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 19 Nov 2001 14:30:48 -0500 Received: from asooo.flowerfire.com ([63.254.226.247]:36882 "EHLO asooo.flowerfire.com") by vger.kernel.org with ESMTP id ; Mon, 19 Nov 2001 14:30:33 -0500 Date: Mon, 19 Nov 2001 13:30:32 -0600 From: Ken Brownfield To: Ken Brownfield Cc: linux-kernel@vger.kernel.org Subject: Re: [VM] 2.4.14/15-pre4 too "swap-happy"? Message-ID: <20011119133032.C1439@asooo.flowerfire.com> In-Reply-To: <200111191801.fAJI1l922388@neosilicon.transmeta.com> <20011119123125.B1439@asooo.flowerfire.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Mailer: Mutt 1.0.1i In-Reply-To: <20011119123125.B1439@asooo.flowerfire.com>; from brownfld@irridia.com on Mon, Nov 19, 2001 at 12:31:25PM -0600 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Actually, I spoke too soon. We developed a quick stress test that causes the problem immediately: 11:18am up 3 days, 1:36, 3 users, load average: 8.72, 7.18, 3.96 91 processes: 85 sleeping, 6 running, 0 zombie, 0 stopped CPU states: 0.1% user, 93.4% system, 0.0% nice, 6.4% idle Mem: 3343688K av, 3340784K used, 2904K free, 0K shrd, 308K buff Swap: 1004052K av, 567404K used, 436648K free 2994288K cached PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND 12102 oracle 13 0 16320 15M 14868 R 5584 67.2 0.4 18:58 oracle 12365 oracle 18 5 39352 38M 37796 R N 30M 66.7 1.1 4:14 oracle 12353 oracle 18 5 39956 38M 38408 R N 31M 66.5 1.1 9:14 oracle 12191 root 13 0 892 852 672 R 0 66.4 0.0 6:09 top 12366 oracle 9 0 892 892 672 S 0 60.0 0.0 3:20 top 9 root 9 0 0 0 0 SW 0 49.0 0.0 9:27 kswapd 11 root 9 0 0 0 0 SW 0 38.3 0.0 3:58 kupdated 105 root 9 0 0 0 0 SW 0 28.8 0.0 4:56 kjournald 470 root 9 0 844 828 472 S 0 28.1 0.0 1:46 gamdrvd 12351 oracle 13 5 39956 38M 38408 S N 31M 25.6 1.1 3:08 oracle 669 oracle 9 0 4780 4780 4384 S 492 24.4 0.1 1:42 oracle 1 root 14 0 476 424 408 R 0 21.6 0.0 1:19 init 2 root 14 0 0 0 0 RW 0 20.8 0.0 1:29 keventd 615 oracle 9 0 8984 8984 8460 S 4380 16.3 0.2 2:41 oracle 388 root 9 0 732 728 592 S 0 11.5 0.0 0:17 syslogd kswapd bounces up and down from 99%. Keys for me are the full system time, the fact that the %CPUs seem to add up to more than 6xCPUs (6-way Xeon), and that processes that aren't really active show up as "active". ASAP, I'll try -pre6 and then -aa1 to compare behavior. The Oracle stress query looks like: select /*+ parallel(mt,5) cache(mt) */ count(*) from mtable_units ; Thanks much, -- Ken. On Mon, Nov 19, 2001 at 12:31:25PM -0600, Ken Brownfield wrote: | Linus, so far 2.4.15-pre4 with your patch does not reproduce the kswapd | issue with Oracle, but I do need to perform more deterministic tests | before I can fully sign off on that. | | BTW, didn't your patch go into -pre5? Or is there an additional mod in | -pre6 that we should try? | -- | Ken. | brownfld@irridia.com | | On Mon, Nov 19, 2001 at 10:07:58AM -0800, Linus Torvalds wrote: | | | | On Mon, 19 Nov 2001, Sebastian Dr?ge wrote: | | > Hi, | | > I couldn't answer ealier because I had some problems with my ISP | | > the heavy swapping problem while burning a cd is solved in pre6aa1 | | > but if you want i can do some statistics tommorow | | | | Well, pre6aa1 performs really badly exactly because it by default doesn't | | swap enough even on _normal_ loads because Andrea is playing with some | | tuning (and see the bad results of that tuning in the VM testing by | | rwhron@earthlink.net). | | | | So the pre6aa1 numbers are kind of suspect - lack of swapping may not be | | due to fixing the problem, but due to bad tuning. | | | | Does plain pre6 solve it? Plain pre6 has a fix where a locked shared | | memory area would previously cause unnecessary swapping, and maybe the CD | | burning buffer is using shmlock.. | | | | Linus | | | | - | | To unsubscribe from this list: send the line "unsubscribe linux-kernel" in | | the body of a message to majordomo@vger.kernel.org | | More majordomo info at http://vger.kernel.org/majordomo-info.html | | Please read the FAQ at http://www.tux.org/lkml/ | - | To unsubscribe from this list: send the line "unsubscribe linux-kernel" in | the body of a message to majordomo@vger.kernel.org | More majordomo info at http://vger.kernel.org/majordomo-info.html | Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/