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. -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
