On Mon, 2011-04-18 at 20:21 +0200, Bart Van Assche wrote: > On Mon, Apr 18, 2011 at 1:44 PM, Jens Axboe <jaxboe@xxxxxxxxxxxx> wrote: > > Bart, can you try and pull: > > > > git://git.kernel.dk/linux-2.6-block.git for-linus > > > > into Linus' tree and see if that works? This has, among other things, > > Neils fixes for MD. > > md seems to work stable with the resulting tree, but it looks there is > a performance regression in the block layer not related to the md > issue. If I run a small block IOPS test on a block device created by > ib_srp (NOOP scheduler) I see about 11% less IOPS than with 2.6.38.3 > (155.000 IOPS with 2.6.38.3 and 140.000 IOPS with 2.6.39-rc3+). The mapping code for ib_srp changed in 2.6.39-rc1, but it showed improved IOPS for a similar setup in my testing so I'd be surprised if it is the culprit. Still, it wouldn't hurt to check. Do you have time to try the new ib_srp code with 2.6.38.3 to eliminate it from the equation? Thanks, Dave -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
