From: Chris Friesen <cfriesen@nortel.com>
To: krishna <krishna.c@globaledgesoft.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: How to measure time accurately.
Date: Mon, 28 Mar 2005 23:07:14 -0600 [thread overview]
Message-ID: <4248E282.1000105@nortel.com> (raw)
In-Reply-To: <424779F3.5000306@globaledgesoft.com>
krishna wrote:
> Hi All,
>
> Can any one tell me how to measure time accurately for a block of C code
> in device drivers.
> For example, If I want to measure the time duration of firmware download.
Most cpus have some way of getting at a counter or decrementer of
various frequencies. Usually it requires low-level hardware knowledge
and often it needs assembly code.
On ppc you'd use the mftbu/mftbl instructions, as suggested by Lee on
x86 you'd use the rdtsc instruction.
Chris
next prev parent reply other threads:[~2005-03-29 5:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-28 3:28 How to measure time accurately krishna
2005-03-29 3:37 ` Lee Revell
2005-03-29 5:07 ` Chris Friesen [this message]
2005-03-29 9:10 ` Jesper Juhl
2005-03-29 9:25 ` Jan Engelhardt
2005-03-29 23:32 ` Peter Chubb
2005-03-30 0:24 ` Chris Friesen
2005-03-30 9:46 ` Jan Engelhardt
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