On Wed, Apr 11, 2012 at 7:04 PM, Josef Bacik <jo...@redhat.com> wrote: > On Wed, Apr 11, 2012 at 05:26:29PM +0200, Ahmet Inan wrote: >> On Tue, Apr 10, 2012 at 5:16 PM, Josef Bacik <jo...@redhat.com> wrote: >> > On Mon, Apr 09, 2012 at 05:20:46PM -0400, Calvin Walton wrote: >> >> On Mon, 2012-04-09 at 16:54 -0400, Josef Bacik wrote: >> >> > On Mon, Apr 09, 2012 at 01:10:04PM -0400, Calvin Walton wrote: >> >> > > On Mon, 2012-04-09 at 11:53 -0400, Calvin Walton wrote: >> >> > > > Hi, >> >> > > > >> >> > > > I have a system that's using a dracut-generated initramfs to mount a >> >> > > > btrfs root. After upgrading to kernel 3.4.0-rc2 to test it out, I've >> >> > > > noticed that the process of mounting the root filesystem takes much >> >> > > > longer with 3.4.0-rc2 than it did with 3.3.1 - nearly 30 seconds >> >> > > > slower! >> >> >> >> > > And the bisect results are in: >> >> > > 285ff5af6ce358e73f53b55c9efadd4335f4c2ff is the first bad commit >> >> > > commit 285ff5af6ce358e73f53b55c9efadd4335f4c2ff >> >> > > Author: Josef Bacik <jo...@redhat.com> >> >> > > Date: Fri Jan 13 15:27:45 2012 -0500 >> >> > > >> >> > > Btrfs: remove the ideal caching code> >> >> > >> >> > Ok can you give this a whirl? You are going to have to boot/reboot a >> >> > few times >> >> > to let the cache get re-generated again to make sure it's taken effect, >> >> > but >> >> > hopefully this will help out. Thanks, >> >> >> >> Unfortunately, it doesn't seem to help. Even after 3 or 4 reboots with >> >> this patch applied I'm still seeing the same delay. >> >> >> > >> > Ok drop that previous patch and give this one a whirl, it helped on my >> > laptop. >> > This is only half of the problem AFAICS, but it's the easier half to fix, >> > in >> > the meantime I need to lock down why we're not writing out cache for a >> > bunch of >> > block groups, but thats trickier since the messages I need are spit out >> > while >> > I'm shutting down, so I need to get creative. Let me know if/how much this >> > helps. Thanks, >> >> i have tried your patch and my system still needs several minutes to boot >> until it can be used. >> Also tried to reboot several times - it doesn't look like its getting better. >> The last thing the system does when its shutting down is a read-only >> remount of "/" so no umount. >> Booting was much faster before i pulled for-linus a few weeks ago but >> i couldn't find the time to bisect it yet .. >> >> please also look at the attached dmesg.txt. >> this is an core i3 system with 2x2TB BTRFS RAID1 and lots of >> home directories and snapshots. >> >> I'm going to test this patch on twenty more computers but with >> smaller HDDs and less files and see if it helps to speed up their >> boot times. >> > > Ok looks like you are running into a different problem. Could you maybe run > bootchart and upload the resulting png somewhere so I can look and see what > all > is running while you boot? Thanks,
http://aam.mathematik.uni-freiburg.de/IAM/homepages/ainan/bootchart.png i have tried your patch now on the twenty more computers i mentioned and still it takes a minute to remount rw "/" on those, even after several reboots. Ahmet -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
