netdev - Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

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Message-ID: <526E95A1.7080701@gmail.com>
Date:	Mon, 28 Oct 2013 10:49:37 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>, Neil Horman <nhorman@...driver.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, sebastien.dugue@...l.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

On 10/28/13 10:24 AM, Ingo Molnar wrote:

> The most accurate method of measurement for such single-threaded
> workloads is something like:
>
> 	taskset 0x1 perf stat -a -C 1 --repeat 20 ...
>
> this will bind your workload to CPU#0, and will do PMU measurements
> only there - without mixing in other CPUs or workloads.

you can drop the -a if you only want a specific CPU (-C arg). And -C in 
perf is cpu number starting with 0, so in your example above -C 1 means 
cpu1, not cpu0.

David


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