Date: Sat, 4 Jul 2009 10:44:30 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>, Matthew Wilcox <matthew@wil.cx>,
       Jens Axboe <jens.axboe@oracle.com>, linux-kernel@vger.kernel.org,
       "Styner, Douglas W" <douglas.w.styner@intel.com>,
       Chinang Ma <chinang.ma@intel.com>,
       "Prickett, Terry O" <terry.o.prickett@intel.com>,
       Matthew Wilcox <matthew.r.wilcox@intel.com>, Eric.Moore@lsi.com,
       DL-MPTFusionLinux@lsi.com
Subject: Re: >10% performance degradation since 2.6.18
Message-ID: <20090704084430.GO2041@one.firstfloor.org>
References: <20090703025607.GK5480@parisc-linux.org> <87skhdaaub.fsf@basil.nowhere.org> <20090703185414.GP23611@kernel.dk> <20090703191321.GO5480@parisc-linux.org> <20090703192235.GV23611@kernel.dk> <20090703194557.GQ5480@parisc-linux.org> <20090703195458.GK2041@one.firstfloor.org> <20090703130421.646fe5cb@infradead.org> <20090703233505.GL2041@one.firstfloor.org> <20090703230408.4433ee39@infradead.org>
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> 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@linux.intel.com -- Speaking for myself only.
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