From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Masover Subject: Re: 2.6.13.2 + reiser4 system hangs and poor performance Date: Tue, 11 Oct 2005 11:52:38 -0500 Message-ID: <434BEDD6.2080508@slaphack.com> References: <623652d50510110922j319d5325i@mail.gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <623652d50510110922j319d5325i@mail.gmail.com> List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Chris Bainbridge Cc: reiserfs-list@namesys.com Chris Bainbridge wrote: > Hi, > > Since updating to 2.6.13.2 last week I've had a couple of system hangs > which required a poweroff. I can now reproduce a bad performance + > can't reboot situation. I'm using gentoo with a reiser4 root > partition. I've only tested this on my own system, so if another > 2.6.13.2 + reiser4 gentoo user could try this that would be useful. > > Under 2.6.12.5, do 'time emerge =sun-jdk-1.5.0.05'. Total time is 2 > minutes 10 seconds. > Under 2.6.13.2, do 'time emerge =sun-jdk-1.5.0.05'. Total time is 6 > minutes 51 seconds. Will appear to hang at the "gzipping man page: > unpack200.1" but eventually finishes. After this, attempting to > shutdown will result in a system hang. > > Like I said, this happens every time I emerge that package. Probably > it causes some pattern of disk I/O that triggers a bug in reiser4. > During the hang time, the pdflush process is taking up most of the > cpu, and there is almost no disk i/o. I tested with a non-preempt > kernel, and get the same. With 2.6.12.5, everything is okay. I'll confirm this. Problem is, I think this was with the mm patch, and I tried the standard patch, which refused to compile. I'll send a more detailed bug report later, but pretty much -- hang (after much longer, the install phaze of a glibc compile), the rest of the system seems to keep functioning, but shutdown doesn't work. Don't remember if it was a single program hanging forever or an actual kernel panic. I don't have all of my Reiser4 machines available at the moment, I'm on an OS X laptop. Some are ssh-able, but some are physically off.