From: David Ahern <dsahern@gmail.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: measuring and/or dealing with "idleness" and variable frequency
Date: Mon, 10 Jun 2013 16:33:20 -0600 [thread overview]
Message-ID: <51B65430.8050501@gmail.com> (raw)
In-Reply-To: <51B652F9.4020402@hp.com>
On 6/10/13 4:28 PM, Rick Jones wrote:
>> I think I could get what I want from that - assuming I could get that to
>> a kernel I can use in my test env, but am guessing it is rather more
>> than I"m looking for at the moment. I'm wondering if there might be a
>> simpler way to go - just get the idle loop to keep looping rather than
>> halt (?) the thread, so there would still be cycle events in the PMU?
>> (And perhaps set the system to a static, high-performance mode to avoid
>> frequency changes and maybe even disable HT?)
>
> Or, after having found
> https://www.kernel.org/doc/Documentation/kernel-parameters.txt, perhaps
> idle=poll?
Yes, that should turn the server into a power-sucking space heater and
keep the cycles counter firing.
David
next prev parent reply other threads:[~2013-06-10 22:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-06 17:46 measuring and/or dealing with "idleness" and variable frequency Rick Jones
2013-06-09 3:21 ` David Ahern
2013-06-10 20:34 ` Rick Jones
2013-06-10 22:28 ` Rick Jones
2013-06-10 22:33 ` David Ahern [this message]
2013-06-10 22:39 ` Rick Jones
2013-06-12 21:21 ` Rick Jones
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