On 10/6/17 5:20 PM, Dave Chinner wrote: > On Fri, Oct 06, 2017 at 11:18:39AM -0500, Eric Sandeen wrote: >> On 10/6/17 10:38 AM, Darrick J. Wong wrote: >>> On Fri, Oct 06, 2017 at 10:46:20AM +0200, Gandalf Corvotempesta wrote: >>> Semirelated question: for a solid state disk on a machine with high CPU >>> counts do we prefer agcount == cpucount to take advantage of the >>> high(er) iops and lack of seek time to increase parallelism? >>> >>> (Not that I've studied that in depth.) >> >> Interesting question. :) Maybe harder to answer for SSD black boxes? > > Easy: switch to multidisk mode if /sys/block/<dev>/queue/rotational > is zero after doing all the other checks. Then SSDs will get larger > AG counts automatically. The "hard part" was knowing just how much parallelism is actually inside the black box. But "multidisk mode" doesn't go too overboard, so yeah that's probably fine. -Eric > Cheers, > > Dave. > -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
