On Thu, Jun 04, 2009 at 09:50:13PM +0200, Jens Axboe wrote: > On Thu, Jun 04 2009, Frederic Weisbecker wrote: > > On Thu, Jun 04, 2009 at 12:07:26PM -0700, Andrew Morton wrote: > > > On Thu, 4 Jun 2009 17:20:44 +0200 Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote: > > > > > > > I've just tested it on UP in a single disk. > > > > > > I must say, I'm stunned at the amount of testing which people are > > > performing on this patchset. Normally when someone sends out a > > > patchset it just sort of lands with a dull thud. > > > > > > I'm not sure what Jens did right to make all this happen, but thanks! > > > > > > I don't know how he did either. I was reading theses patches and *something* > > pushed me to my testbox, and then I tested... > > > > Jens, how do you do that? > > Heh, not sure :-) > > But indeed, thanks for the testing. It looks quite interesting. I'm > guessing it probably has to do with who ends up doing the balancing and > that the flusher threads block, it may change the picture a bit. So it > may just be that it'll require a few vm tweaks. I'll definitely look > into it and try and reproduce your results. > > Did you run it a 2nd time on each drive and check if the results were > (approximately) consistent on the two drives? Another snapshot, only with bdi-writeback this time. http://kernel.org/pub/linux/kernel/people/frederic/dbench2.pdf Looks like the same effect but the difference is more quiet this time. I guess there is a good bunch of entropy inside, so it's hard to tell :) I'll test with no op scheduler. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
