Hi, Which IO scheduler do you use? I used to have terrible read performance during a btrfs scrub until I switched the disk scheduler from deadline to cfq. Cheers, Dan
On Mon, Mar 11, 2013 at 11:26 AM, Swâmi Petaramesh <sw...@petaramesh.org> wrote: > Hi, > > I use "ionice -c 3 <command>" to run some low-priority background tasks > (i.e. tar, big file copies, or performing checksums sur very big files) > using the disk "only when idle", which would be supposed to have very > little impact on my system performance meanwhile. > > I can be pretty sure that those tasks are I/O-bound and use very little > CPU (and they are niced as well, anyway). > > However, when such tasks are running my BTRFS system slows down to a > crawl, becomes very very unresponsive, and it seems to me that disk I/O > is completely saturated (LED is fixed lit...) > > So I wonder if BTRFS correctly support ionice, or if it's plain useless ? > > TIA > > Kind regards. > > -- > Swāmi Petaramesh <sw...@petaramesh.org> http://petaramesh.org PGP 9076E32E > Ne cherchez pas : Je ne suis pas sur Facebook. > > -- > 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 -- 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
