linux-kernel - Re: [patch 1/3] slub: add per-cache slab thrash ratio

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Message-ID: <alpine.DEB.1.10.0903311323040.1912@qirst.com>
Date:	Tue, 31 Mar 2009 13:24:22 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Martin Bligh <mbligh@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] slub: add per-cache slab thrash ratio

On Tue, 31 Mar 2009, David Rientjes wrote:

> I'd agree that it should be cleared if the tunable had object units
> instead of a ratio, but the ratio simply applies to any given order.

Right but resetting the order usually has a significant impact on the
threashing behavior (if it exists). Why would we keep the threshing ratio
that was calculated for another slab configuration?

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