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Re: Cavium mips64 perf counters

from [David Daney] [Permanent Link][Original]
To: Giant Sand Fan's <rampxxxx@gmail.com>
Subject: Re: Cavium mips64 perf counters
From: David Daney <ddaney@caviumnetworks.com>
Date: Mon, 26 Apr 2010 10:06:00 -0700
Cc: linux-mips@linux-mips.org
In-reply-to: <l2p417f50831004260640o684d0f8fgf6a3aa60450e329c@mail.gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <l2p417f50831004260640o684d0f8fgf6a3aa60450e329c@mail.gmail.com>
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On 04/26/2010 06:40 AM, Giant Sand Fan's wrote:

Hi,

I'm trying to calculate de CPU load by access the performance counters
in mips and I haved reading in the cp0 but my problem is that I cannot
find documentation about the real meaning of these counters :

1.-LOG_PERF_CNT_NISSUE : ¿means cycle with no issue?

2.-LOG_PERF_CNT_SISSUE : ¿means cycle with     issue?


Single issue.



3.-LOG_PERF_CNT_DISSUE: ¿means cycle with double issue?



That's right.  And PERF_CNT_CLK is the number of cycles.

David Daney
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