linux-kernel - Re: Mainline kernel OLTP performance update

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Message-ID: <87sknjeemn.fsf@basil.nowhere.org>
Date:	Fri, 16 Jan 2009 11:20:32 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Matthew Wilcox <matthew@....cx>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	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, 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
Subject: Re: Mainline kernel OLTP performance update

"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> writes:


> I think that's because SLQB
> doesn't pass through big object allocation to page allocator.
> netperf UDP-U-1k has less improvement with SLQB.

That sounds like just the page allocator needs to be improved.
That would help everyone. We talked a bit about this earlier,
some of the heuristics for hot/cold pages are quite outdated
and have been tuned for obsolete machines and also its fast path
is quite long. Unfortunately no code currently.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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