---------- Forwarded message ---------- From: Dushan Tcholich <dusanc@xxxxxxxxx> Date: Nov 9, 2007 3:03 PM Subject: Re: [BUG] reiser4-for-2.6.22-2 Large stalls when using atime mount option To: Edward Shishkin <edward.shishkin@xxxxxxxxx> There were some stalls, but a lot shorter than before (~7sec on shutdown with patch, ~3.5min without), and no kernel messages. Stalls that were encountered during normal use were short 1-3sec. Take all this with a grain of salt because, for me, these are hard to reproduce. kernel2.6.22-r8+reiser-for-2.6.22-2.patch+reiser4-discard-entd.patch reiser4 mounted as / without -noatime option. Dusan On Nov 9, 2007 2:04 AM, Edward Shishkin <edward.shishkin@xxxxxxxxx> wrote: > Hello guys. > This is the promised patch against (2.6.22 + reiser4-for-2.6.22-2). > > Note, that this patch may cause problems, so keep also a stable kernel > to boot on. > The goal is to detect any progress in preventing the nasty stalls: > please boot to the > patched kernel and try to reproduce them. If you encounter oops, then > reboot to the > same kernel and try again. If oopses are annoying, then boot to the > stable kernel and > let me know about it. > > Waiting for your results.. > Thanks, > Edward. > > > On 11/8/07, Dushan Tcholich <dusanc@xxxxxxxxx> wrote: > > Hi > > > > On Nov 7, 2007 10:31 PM, Edward Shishkin <edward.shishkin@xxxxxxxxx> wrote: > > > Hello. > > > > > > On 11/7/07, Dushan Tcholich <dusanc@xxxxxxxxx> wrote: > > > > Kernel: Gentoo 2.6.22-r2 + reiser4-for-2.6.22-2.patch > > > > fstab: > > > > /dev/sda2 /boot ext2 noauto,noatime 1 2 > > > > /dev/sda5 / reiser4 0 0 > > > > /dev/sda3 none swap sw 0 0 > > > > /dev/sda6 /home ext3 noatime 0 0 > > > > > > > > reiser4 partition is with cryptocompress (lzo) default settings. > > > > > > > > I usually mount r4 with -noatime, but after some debbuging with some users > > > > on irc (rvalles), who have intermitent large stalls, we found that only > > > > difference between our setups was my -noatime flag in fstab. > > > > > > Plus rvalles doesn't use compression (isn't it?) > > > > He had stalls without compression, but now switched to compression and > > still has them. > > But I can't reproduce them with -noatime option. > > > > > > > I tried to mount / without -noatime, started gnome, and then in about same > > > > time evolution, firefox, played some mp3s, avis, did a kernel compile, > > > > emerge -uD world (compiled few packages), acessed some random fles in > > > > /usr/src/linux, started gnome disk usage analyser etc. and had no stalls at > > > > all. > > > > And then I tried to reboot. System stalled for 3min 25 sec (i was ready with > > > > a watch :)) before printing the first message, with heavy disk activity. > > > > Upon reboot I just changed line in fstab with nano to mount r4 with -noatime > > > > and rebooted agin. Now there were no stalls. > > > > > > > > To my inexperienced eyes it looks like lazy writes of atime are adding > > with that "reiser4 writes continuously to same sector" bug. > > > > > > > > Currently I am preparing a patch for this problem. > > > Not sure about its efficiency: we'll take a look.. > > > > Great > > > > > > > > Thanks, > > > Edward. > > > > > > > Dushan > > > - To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
