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

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Date:	Sat, 4 Jul 2009 10:44:30 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Matthew Wilcox <matthew@....cx>,
	Jens Axboe <jens.axboe@...cle.com>,
	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

> for networking, especially for incoming data such as new connections,
> that isn't the case.. that's more or less randomly (well hash based)
> distributed.

Ok. Still binding them all to a single CPU all is quite dumb. It
makes MSI-X quite useless and probably even harmful.

We don't default to socket power saving for normal scheduling either, 
but only when you specify a special knob. I don't see why interrupts
should be different.

-Andi

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