On 04/23/2015 08:52 AM, Chris Mason wrote: > On 04/23/2015 08:45 AM, Filipe David Manana wrote: >> On Wed, Apr 22, 2015 at 5:55 PM, Chris Mason <c...@fb.com> wrote: >>> On 04/22/2015 12:37 PM, Holger Hoffstätte wrote: >>>> On Wed, 22 Apr 2015 18:09:18 +0200, Lutz Vieweg wrote: >>>> >>>>> On 04/13/2015 09:52 PM, Chris Mason wrote: >>>>>> Large filesystems with lots of block groups can suffer long stalls during >>>>>> commit while we create and send down all of the block group caches. The >>>>>> more blocks groups dirtied in a transaction, the longer these stalls can >>>>>> be. >>>>>> Some workloads average 10 seconds per commit, but see peak times much >>>>>> higher. >>>>> >>>>> Since we see this problem very frequently on some shared development >>>>> servers, >>>>> I will try to install this ASAP. >>>>> >>>>> Meanwhile, can anybody already tell success stories about successfully >>>>> removing >>>>> lags by this patch? >>>> >>>> Works fine, but make sure to get the followup patch [1] as well while >>>> you're >>>> at it. I've observed that my (bandwidth-throttled) backups now cause >>>> shorter, >>>> nicely spaced-out blips of activity instead of longer ones when the >>>> writeback >>>> kicks in. >>>> >>>> -h >>>> >>>> [1] >>>> https://git.kernel.org/cgit/linux/kernel/git/mason/linux-btrfs.git/commit/?h=integration-4.1&id=c1e31ffc317e4c28d242b1d961c9c6fe673c0377 >>>> >>> >>> Great to hear. I recommend just using my for-linus-4.1 branch, since it >>> has all the good things in one place. >> >> Trying the current integration-4.1 branch, I ran into the following >> during xfstests/btrfs/049: >> > > Ugh, I must not be waiting correctly in one of the inode cache writeout > sections. But I've run 049 a whole bunch of times without triggering, > can you get this to happen consistently? >
Ok, I can actually trigger with an fs_mark script. Fixing. -chris -- 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
