On 06/21/2011 01:15 PM, Jan Stilow wrote: > Hello, > > Nirbheek Chauhan <nirbheek <at> gentoo.org> writes: >> [...] >> >> Every few minutes, (I guess) when applications do fsync (firefox, >> xchat, vim, etc), all applications that use fsync() hang for several >> seconds, and applications that use general IO suffer extreme >> slowdowns. iotop shows various combinations of the processes listed >> below doing writes, and the total write as 2-3MB/s. >> >> [btrfs-dealloc-] >> [btrfs-submit-0] >> [btrfs-transacti] >> [btrfs-endio-wri] >> [flush-btrfs-1] > > I'm using btrfs under a 2.6.39-ARCH kernel and run into the same issue. > > In my case the [btrfs-submit-0] and [btrfs-transacti] shows up in iotop > and produce 99% of IO at the time a application is frozen. For something > like 10 to 30 seconds. > > [...]
I see the same issue. I have bisected it to 4e69b598f6cfb0940b75abf7e179d6020e94ad1e is the first bad commit commit 4e69b598f6cfb0940b75abf7e179d6020e94ad1e Author: Josef Bacik <[email protected]> Date: Mon Mar 21 10:11:24 2011 -0400 Btrfs: cleanup how we setup free space clusters ...which came in between 2.6.38 and 2.6.39. The newest kernel I have tried was 3.0-rc7, which still had the bug. I have not tried 3.1-rc1, but plan to soon. --Andrew -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
