linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Date:	Fri, 2 Mar 2007 19:15:38 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	William Lee Irwin III <wli@...omorphy.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Bill Irwin <bill.irwin@...cle.com>, Mel Gorman <mel@...net.ie>,
	npiggin@...e.de, mingo@...e.hu, jschopp@...tin.ibm.com,
	arjan@...radead.org, torvalds@...ux-foundation.org,
	mbligh@...igh.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

On Fri, 2 Mar 2007, William Lee Irwin III wrote:

> On Fri, Mar 02, 2007 at 02:22:56PM -0800, Andrew Morton wrote:
> > Opterons seem to be particularly prone to lock starvation where a cacheline
> > gets captured in a single package for ever.
> 
> AIUI that phenomenon is universal to NUMA. Maybe it's time we
> reexamined our locking algorithms in the light of fairness
> considerations.

This is a phenomenon that is usually addressed at the cache logic level. 
Its a hardware maturation issue. A certain package should not be allowed
to hold onto a cacheline forever and other packages must have a mininum 
time when they can operate on that cacheline.



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