linux-kernel - Re: Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task

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Message-ID: <87y72k9otw.fsf@basil.nowhere.org>
Date:	Tue, 26 Aug 2008 10:12:59 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Theodore Tso <tytso@....edu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	edwin <edwintorok@...il.com>, Ingo Molnar <mingo@...e.hu>,
	rml@...h9.net, Linux Kernel <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner mingo@...hat.com" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task

Theodore Tso <tytso@....edu> writes:

As a general comment it still sounds there is a regression here?
If the workload was faster in an earlier kernel and is now slow
clearly something got slower? And that might be fixable. 
Perhaps something for Rafael's list?

> Maybe if I had used hugepages it would have been a win, 

hugepages do not support arbitary file backing.

-Andi

-- 
ak@...ux.intel.com
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