From: Ingo Molnar <mingo@elte.hu>
To: ling.ma@intel.com, Arjan van de Ven <arjan@infradead.org>,
Dave Jones <davej@redhat.com>
Cc: hpa@zytor.com, tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform
Date: Thu, 26 Nov 2009 10:49:30 +0100 [thread overview]
Message-ID: <20091126094930.GD32275@elte.hu> (raw)
In-Reply-To: <1259222752-8161-1-git-send-email-ling.ma@intel.com>
* ling.ma@intel.com <ling.ma@intel.com> wrote:
> Benchmarks: improvement
> volano 8%
> netperf 6.7%
> tbench 6.45%
> Kbuild 5.5% (3 time test, average improvement)
that Kbuild result looks suspicious. A kbuild only uses 25% of system
time, so an 5.5% improvement means that system utilization dropped from
25% to 19.5%, a 28% improvement in the kernel! That looks rather
unlikely.
Could you please post before/after 'perf stat --repeat 3' results so
that we can see the noise level?
Thanks,
Ingo
next prev parent reply other threads:[~2009-11-26 9:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-26 8:05 [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform ling.ma
2009-11-26 9:49 ` Ingo Molnar [this message]
2009-12-01 8:54 ` Ma, Ling
2009-12-01 10:14 ` Arjan van de Ven
2009-12-01 16:11 ` H. Peter Anvin
2009-12-03 15:03 ` Ma, Ling
2009-12-03 15:05 ` H. Peter Anvin
2009-12-03 15:31 ` Ingo Molnar
2009-12-03 15:46 ` H. Peter Anvin
2009-12-02 9:47 ` Ingo Molnar
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