Date: Tue, 13 Oct 2009 16:28:10 -0400 (EDT)
From: Christoph Lameter <cl@linux-foundation.org>
To: David Rientjes <rientjes@google.com>
cc: Pekka Enberg <penberg@cs.helsinki.fi>, Tejun Heo <tj@kernel.org>,
       linux-kernel@vger.kernel.org,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Mel Gorman <mel@csn.ul.ie>, Zhang Yanmin <yanmin_zhang@linux.intel.com>
Subject: Re: [this_cpu_xx V6 7/7] this_cpu: slub aggressive use of this_cpu
 operations in the hotpaths
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References: <20091007211024.442168959@gentwo.org> <20091007211053.378634196@gentwo.org> <4AD307A5.105@kernel.org> <84144f020910120614r529d8e4em9babe83a90e9371f@mail.gmail.com> <alpine.DEB.1.00.0910130231570.27262@chino.kir.corp.google.com>
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On Tue, 13 Oct 2009, David Rientjes wrote:

> For an optimized fastpath, I'd expect such a workload would result in at
> least a slightly higher transfer rate.

There will be no improvements if the load is dominated by the
instructions in the network layer or caching issues. None of that is
changed by the path. It only reduces the cycle count in the fastpath.


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