On Thu, Apr 12, 2012 at 09:37:48AM -0400, Josef Bacik wrote: > On Thu, Apr 12, 2012 at 11:22:51AM +0200, Ahmet Inan wrote: > > 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. > > > > Oops responding to the whole list this time.. > > Um ouch your system appears to not be doing anything for like 300 seconds but > sitting there. Can you hook up a console and capture sysrq+w while thats > going > on? Also you are mounting with -o space_cache right? Can I see your dmesg to > make sure it's doing what it's supposed to? Thanks, >
Ok you don't actually have space_cache enabled it looks like, make sure to add space_cache to your fstab so it gets enabled, and then reboot a few times to make sure everything gets cached right and then it should help. Thanks, Josef -- 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
