linux-kernel - Re: >10% performance degradation since 2.6.18

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Message-ID: <20090703195458.GK2041@one.firstfloor.org>
Date:	Fri, 3 Jul 2009 21:54:58 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Styner, Douglas W" <douglas.w.styner@...el.com>,
	Chinang Ma <chinang.ma@...el.com>,
	"Prickett, Terry O" <terry.o.prickett@...el.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Eric.Moore@....com, DL-MPTFusionLinux@....com
Subject: Re: >10% performance degradation since 2.6.18

> That would seem to be a fruitful avenue of
> investigation -- whether limiting the cards to a single RX/TX interrupt
> would be advantageous, or whether spreading the eight interrupts out
> over the CPUs would be advantageous.

The kernel should really do the per cpu binding of MSIs by default.

-Andi

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