linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Fri, 16 Jan 2009 18:06:59 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	sfr@...b.auug.org.au, matthew.r.wilcox@...el.com,
	chinang.ma@...el.com, linux-kernel@...r.kernel.org,
	sharad.c.tripathi@...el.com, arjan@...ux.intel.com,
	andi.kleen@...el.com, suresh.b.siddha@...el.com,
	harita.chilukuri@...el.com, douglas.w.styner@...el.com,
	peter.xihong.wang@...el.com, hubert.nueckel@...el.com,
	chris.mason@...cle.com, srostedt@...hat.com,
	linux-scsi@...r.kernel.org, andrew.vasquez@...gic.com,
	anirban.chakraborty@...gic.com,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: Mainline kernel OLTP performance update

On Friday 16 January 2009 17:55:47 Matthew Wilcox wrote:
> On Fri, Jan 16, 2009 at 05:46:23PM +1100, Nick Piggin wrote:
> > Intel's OLTP shows SLQB is "neutral" to SLAB. That is, literally within
> > their measurement confidence interval. If it comes down to it, I think we
> > could get them to do more runs to narrow that down, but we're talking a
> > couple of tenths of a percent already.
>
> I think I can speak with some measure of confidence for at least the
> OLTP-testing part of my company when I say that I have no objection to
> Nick's planned merge scheme.
>
> I believe the kernel benchmark group have also done some testing with
> SLQB and have generally positive things to say about it (Yanmin added to
> the gargantuan cc).
>
> Did slabtop get fixed to work with SLQB?

Yes the old slabtop that works on /proc/slabinfo works with SLQB (ie. SLQB
implements /proc/slabinfo).

Lin Ming recently also ported the SLUB /sys/kernel/slab/ specific slabinfo
tool to SLQB. Basically it reports in-depth internal event counts etc. and
can operate on individual caches, making it very useful for performance
"observability" and tuning.

It is hard to come up with a single set of statistics that apply usefully
to all the allocators. FWIW, it would be a useful tool to port over to
SLAB too, if we end up deciding to go with SLAB.

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