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Subject: Re: fastforward/routing: a 3 million packet-per-second system?
From: Adrian Chadd <adrian@freebsd.org>
To: George Neville-Neil <gnn@neville-neil.com>
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Cc: FreeBSD Net <freebsd-net@freebsd.org>, Navdeep Parhar <nparhar@gmail.com>,
 John Jasen <jjasen@gmail.com>
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On 27 July 2014 13:42, George Neville-Neil <gnn@neville-neil.com> wrote:
> On 22 Jul 2014, at 20:30, Adrian Chadd wrote:
>
>> hi!
>>
>> You can use 'pmcstat -S CPU_CLK_UNHALTED_CORE -O pmc.out' (then ctrl-C
>> it after say 5 seconds), which will log the data to pmc.out;
>> then 'pmcannotate -k /boot/kernel pmc.out /boot/kernel/kernel' to find
>> out where the most cpu cycles are being spent.
>>
>
> Chiming in late, but don't you mean instruction-retired instead of
> CPU_CLK_UNHALTED_CORE?

Nope. the hardware retires instructions in parallel. That gives a
different indication of a different class of bottlenecks.


-a