linux-kernel - Re: about interlagos

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Message-ID: <4FDC4FF8.1030804@ladisch.de>
Date:	Sat, 16 Jun 2012 11:20:56 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Mahmood Naderan <nt_mahmood@...oo.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: about interlagos

Mahmood Naderan wrote:
> As you can see, although interlagos is the newest one which has higher cpu
> clock rate and higher cache size, the bogomips of interlagos is the lowest!
> I read that bogomips is not a true measurement,

Indeed it is not.

> but it senses as a speed meter.

It measures the speed of one particular delay loop.  Because such a busy
loop is pretty much the silliest thing you could do to a CPU, it does
not make sense to use it to measure overall CPU speed, or to compare
different microarchitectures.

> Any idea?

If you want to know how fast your code will execute, you have to measure
that code.  If you are too lazy to do this, search for a benchmark that
represents that code well; for general-purpose code, the gcc part of the
SPEC CPU benchmark probably comes closest.

Regards,
Clemens
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