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 -- 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
