On Sun, Sep 13, 2015 at 09:12:44AM -0400, Chris Mason wrote: > On Sat, Sep 12, 2015 at 07:46:32PM -0400, Chris Mason wrote: > > I don't think the XFS numbers can be trusted too much since it was > > basically bottlenecked behind that single pegged CPU. It was bouncing > > around and I couldn't quite track it down to a process name (or perf > > profile). > > I'll do more runs Monday, but I was able to grab a perf profile of the > pegged XFS CPU. It was just the writeback worker thread, and it > hit btrfs differently because we defer more of this stuff to endio > workers, effectively spreading it out over more CPUs. > > With 4 mount points intead of 2, XFS goes from 140K files/sec to 250K. > Here's one of the profiles, but it bounced around a lot so I wouldn't > use this to actually tune anything:
mkfs.xfs -d agcount=64 .... Cheers, Dave. -- Dave Chinner da...@fromorbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
