From: Andi Kleen <andi@firstfloor.org>
To: Theodore Tso <tytso@mit.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
edwin <edwintorok@gmail.com>, Ingo Molnar <mingo@elte.hu>,
rml@tech9.net, Linux Kernel <linux-kernel@vger.kernel.org>,
"Thomas Gleixner mingo@redhat.com" <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task
Date: Tue, 26 Aug 2008 10:12:59 +0200 [thread overview]
Message-ID: <87y72k9otw.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080825134801.GN1408@mit.edu> (Theodore Tso's message of "Mon, 25 Aug 2008 09:48:01 -0400")
Theodore Tso <tytso@mit.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@linux.intel.com
next prev parent reply other threads:[~2008-08-26 8:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <48B1CC15.2040006@gmail.com>
2008-08-25 5:51 ` Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task Peter Zijlstra
2008-08-25 7:04 ` edwin
2008-08-25 9:23 ` Peter Zijlstra
2008-08-25 9:49 ` Török Edwin
2008-08-25 10:02 ` Peter Zijlstra
2008-08-25 10:22 ` Török Edwin
2008-08-25 10:36 ` Peter Zijlstra
2008-08-25 11:00 ` edwin
2008-08-25 11:30 ` edwin
2008-08-25 11:41 ` Peter Zijlstra
2008-08-25 13:48 ` Theodore Tso
2008-08-26 8:12 ` Andi Kleen [this message]
2008-09-08 19:10 ` Török Edwin
2008-09-12 19:16 ` mmap/munmap latency on multithreaded apps, because pagefaults hold mmap_sem during disk read Török Edwin
2008-09-12 19:16 ` Török Edwin
2008-09-12 19:35 ` Mike Waychison
2008-09-12 19:35 ` Mike Waychison
2008-09-12 20:10 ` Török Edwin
2008-09-12 20:10 ` Török Edwin
2008-08-25 10:37 ` Quad core CPUs loaded at only 50% when running a CPU and mmap intensive multi-threaded task Peter Zijlstra
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