From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx153.postini.com [74.125.245.153]) by kanga.kvack.org (Postfix) with SMTP id D73406B012A for ; Fri, 5 Apr 2013 18:18:15 -0400 (EDT) Received: by mail-we0-f179.google.com with SMTP id p43so3205027wea.24 for ; Fri, 05 Apr 2013 15:18:14 -0700 (PDT) Message-ID: <515F4DA3.2000000@suse.cz> Date: Sat, 06 Apr 2013 00:18:11 +0200 From: Jiri Slaby MIME-Version: 1.0 Subject: Re: Excessive stall times on ext4 in 3.9-rc2 References: <20130402142717.GH32241@suse.de> <20130402150651.GB31577@thunk.org> <20130402151436.GC31577@thunk.org> <20130403101925.GA7341@suse.de> In-Reply-To: <20130403101925.GA7341@suse.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , Theodore Ts'o Cc: linux-ext4@vger.kernel.org, LKML , Linux-MM On 04/03/2013 12:19 PM, Mel Gorman wrote: > On Tue, Apr 02, 2013 at 11:14:36AM -0400, Theodore Ts'o wrote: >> On Tue, Apr 02, 2013 at 11:06:51AM -0400, Theodore Ts'o wrote: >>> >>> Can you try 3.9-rc4 or later and see if the problem still persists? >>> There were a number of ext4 issues especially around low memory >>> performance which weren't resolved until -rc4. >> >> Actually, sorry, I took a closer look and I'm not as sure going to >> -rc4 is going to help (although we did have some ext4 patches to fix a >> number of bugs that flowed in as late as -rc4). >> > > I'm running with -rc5 now. I have not noticed much interactivity problems > as such but the stall detection script reported that mutt stalled for > 20 seconds opening an inbox and imapd blocked for 59 seconds doing path > lookups, imaps blocked again for 12 seconds doing an atime update, an RSS > reader blocked for 3.5 seconds writing a file. etc. > > There has been no reclaim activity in the system yet and 2G is still free > so it's very unlikely to be a page or slab reclaim problem. Ok, so now I'm runnning 3.9.0-rc5-next-20130404, it's not that bad, but it still sucks. Updating a kernel in a VM still results in "Your system is too SLOW to play this!" by mplayer and frame dropping. 3.5G out of 6G memory used, the rest is I/O cache. I have 7200RPM disks in my desktop. -- js suse labs -- 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