From: Andi Kleen <ak@suse.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: tim.c.chen@linux.intel.com, Adrian Bunk <bunk@stusta.de>,
linux-kernel@vger.kernel.org, discuss@x86-64.org
Subject: Re: 2.6.19-rc1: x86_64 slowdown in lmbench's fork
Date: Fri, 3 Nov 2006 19:39:59 +0100 [thread overview]
Message-ID: <200611031939.59208.ak@suse.de> (raw)
In-Reply-To: <m18xisxul1.fsf@ebiederm.dsl.xmission.com>
> Which invalidates the tlb fault hypothesis unless it happens to lie
> on the 2MB boundary.
It's in different pages than the code.
One drawback of using large TLBs is that the CPUs tend to have a lot less
of them than small TLBs so they can actually thrash quicker if you're unlucky.
Only profiling can tell I guess.
-Andi
next prev parent reply other threads:[~2006-11-03 18:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-02 16:44 2.6.19-rc1: Slowdown in lmbench's fork Tim Chen
2006-11-02 18:33 ` Eric W. Biederman
2006-11-02 18:34 ` Tim Chen
2006-11-03 2:11 ` 2.6.19-rc1: x86_64 slowdown " Adrian Bunk
2006-11-03 9:08 ` Eric W. Biederman
2006-11-03 16:10 ` Tim Chen
2006-11-03 17:35 ` Eric W. Biederman
2006-11-03 17:47 ` Andi Kleen
2006-11-03 18:18 ` Eric W. Biederman
2006-11-03 18:39 ` Andi Kleen [this message]
2006-11-03 20:25 ` Tim Chen
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