On Sun, Oct 07, 2012 at 03:26:32AM -0600, Swâmi Petaramesh wrote: > Hi, > > I have 4 machines, all converted to BTRFS about 6 months ago, now all > running Ubuntu Quantal with kernel 3.5.0-17 > > The matter is that all these machines are now getting slower and slower > everyday, every disk access causing the disk to be 100% busy for long > periods, to the point that I'm now seriously considering migrating > everything back to ext4... > > From the start BTRFS was "not very fast", still satisfactory, but now it > becomes truly unusable. > > On one machine, I know have a typical complete boot time to a usable GUI > that is over 4 minutes, with the HD still very busy for a couple more > minutes afterwards, where it used to be around 35-40 seconds in ext4 ! > > Is there anything I could do to speed things back (without losing all my > snapshots or doubling the size of data on disk)...? > > I already had made the move back from BTRFS to ext4 about 18 months ago, > I found it had improved so was back to BTRFS, and I wouldn't have to > revert back again :-/ > > Any advice or help greatly appreciated. >
Can you get sysrq+w when you are seeing slowness? Usually bootup slow times means you don't have space_cache enabled or your cache is being evicted for some reason, can you check dmesg after bootup for messages related to space cache? Thanks, Josef -- 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
