Hello list, I've been using btrfs on my personal machines for about two years now, and on this machine for about a year with absolutely no problems. Infact, it has held up better than ext4 with regards to reliability.
However, recently, perhaps with 2.6.39, or after I quickly started filling up my disk again, it has become impossible for me to work for long periods on my machine. 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] In some extreme cases, I've had hangs for 5 whole minutes. I'm really beginning to appreciate how little I/O GNOME Shell does since it remains completely responsive throughout this. I have a feeling that the cause for this is extreme fragmentation. My hard disk is a 500GB SATA hdd, my btrfs partition details are: # btrfs filesystem show Label: 'gentoo' uuid: 6f539d7f-f70f-4216-a4a9-6f7a2117a04a Total devices 1 FS bytes used 246.37GB devid 1 size 345.13GB used 345.13GB path /dev/sda7 Btrfs v0.19-35-g1b444cd-dirty What can I do to debug this issue? What other information should I supply? Could someone guide me on how to figure out why my machine is unusable now? Thanks in advance, -- ~Nirbheek Chauhan Gentoo GNOME+Mozilla Team -- 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