linux-kernel - Re: about interlagos

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Message-ID: <1339839177.39525.YahooMailNeo@web111722.mail.gq1.yahoo.com>
Date:	Sat, 16 Jun 2012 02:32:57 -0700 (PDT)
From:	Mahmood Naderan <nt_mahmood@...oo.com>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: about interlagos

Thanks
// Naderan *Mahmood;

----- Original Message -----
From: Clemens Ladisch <clemens@...isch.de>
To: Mahmood Naderan <nt_mahmood@...oo.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Sent: Saturday, June 16, 2012 1:50 PM
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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