linux-kernel - Re: [PATCH] expand micro-optimizations in kernel to newer model CPUs

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Message-ID: <52AAFF89.5080509@gmail.com>
Date:	Fri, 13 Dec 2013 07:37:29 -0500
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	David Heidelberger <david.heidelberger@...t.cz>,
	John <da_audiophile@...oo.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] expand micro-optimizations in kernel to newer model CPUs

On 2013-12-09 22:51, David Heidelberger wrote:
> Hello,
> 
> this patch is used in Gentoo geek-sources and mptcp-sources (and
> probably in lot other kernel sources sets). So, there was lot testing.
> 
> It's not _big_ performance difference, but -mtune=native is nice to have.
> It could be great, if this kernel option could be fully utilized without
> need of additional patching.

This really depends on how you define 'big'.  Even a 1% performance
increase is significant for a realtime system, and for someone with a
cluster of systems, getting even a small improvement in performance on
all of the systems could mean a huge increase in effective processing power.
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