Re: Mainline kernel OLTP performance update

Nick Piggin
2009-01-16T10:21:31Z

On Friday 16 January 2009 21:16:31 Pekka Enberg wrote:
> On Thu, Jan 15, 2009 at 11:46:09AM +0200, Pekka Enberg wrote:
> >> It would also be nice if someone could do the performance analysis on
> >> the SLUB bug. I ran sysbench in oltp mode here and the results look
> >> like this:
> >>
> >> [ number of transactions per second from 10 runs. ]
> >>
> >> min max avg sd
> >> 2.6.29-rc1-slab 833.77 852.32 845.10 4.72
> >> 2.6.29-rc1-slub 823.61 851.94 836.74 8.57

> I had lockdep enabled in my config so I ran the tests again with
> x86-64 defconfig and I'm back to square one:
>
> [ number of transactions per second from 10 runs, bigger is better ]
>
> min max avg sd
> 2.6.29-rc1-slab 802.02 805.37 803.93 0.97
> 2.6.29-rc1-slub 807.78 811.20 809.86 1.05

Hm, I wonder why it is going slower with lockdep disabled?
Did something else change?