From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 823426B0055 for ; Mon, 5 Oct 2009 02:51:06 -0400 (EDT) From: Frans Pop Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn Date: Mon, 5 Oct 2009 08:50:58 +0200 References: <3onW63eFtRF.A.xXH.oMTxKB@chimera> <200910021111.55749.elendil@planet.nl> <200910050714.01908.elendil@planet.nl> In-Reply-To: <200910050714.01908.elendil@planet.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200910050851.02056.elendil@planet.nl> Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Pekka Enberg , Reinette Chatre , Bartlomiej Zolnierkiewicz , Karol Lewandowski , linux-mm@kvack.org List-ID: On Monday 05 October 2009, Frans Pop wrote: > I'll dig into this a bit more as it looks like this should be > reproducible, probably even without the kernel build. Next step is to > see how .30 behaves in the same situation. This looks conclusive. I tested .30 and .32-rc3 from clean reboots and only starting gitk. I only started music playing in the background (amarok) from an NFS share to ensure network activity. With .32-rc3 I got 4 SKB allocation errors while starting the *second* gitk instance. And the system was completely frozen with music stopped until gitk finished loading. With .30 I was able to start *three* gitk's (which meant 2 of them got (partially) swapped out) without any allocation errors. And with the system remaining relatively responsive. There was a short break in the music while I started the 2nd instance, but it just continued playing afterwards. There was also some mild latency in the mouse cursor, but nothing like the full desktop freeze I get with .32-rc3. With .30 I looked at /proc/buddyinfo while the 3rd gitk was being started, and that looked fairly healthy all the time: Node 0, zone DMA 5 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 579 67 25 8 5 1 1 0 1 1 0 Node 0, zone DMA 5 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 276 54 13 15 8 10 3 1 1 1 0 Node 0, zone DMA 4 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 119 45 24 18 12 4 5 2 1 1 0 Node 0, zone DMA 4 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 527 13 9 5 5 3 2 1 1 1 0 Node 0, zone DMA 5 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 1375 24 7 7 8 5 1 1 0 1 0 Node 0, zone DMA 5 9 22 20 21 11 0 0 0 0 1 Node 0, zone DMA32 329 21 3 3 17 8 5 1 0 1 0 With .32 it was obviously impossible to get that info due to the total freeze of the desktop. Not sure if the scheduler changes in .32 contribute to this. Guess I could find out by doing the same test with .31. One thing I should mention: my swap is an LVM volume that's in a VG that's on a LUKS encrypted partition. Does this give you enough info to go on, or should I try a bisection? Cheers, FJP -- 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