From: Michael Neuling <mikey@neuling.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: ego@in.ibm.com, Andreas Herrmann <andreas.herrmann3@amd.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7
Date: Thu, 21 Jan 2010 10:58:01 +1300 [thread overview]
Message-ID: <29111.1264024681@neuling.org> (raw)
In-Reply-To: <1264020517.4283.1117.camel@laptop>
> > On Power7 processors running in SMT4 mode with 2, 3, or 4 idle threads
> > there is performance benefit to idling the higher numbered threads in
> > the core.
>
> So this is an actual performance improvement, not only power savings?
It's primarily a performance improvement. Any power/energy savings
would be a bonus.
Mikey
WARNING: multiple messages have this Message-ID (diff)
From: Michael Neuling <mikey@neuling.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Joel Schopp <jschopp@austin.ibm.com>,
ego@in.ibm.com, Andreas Herrmann <andreas.herrmann3@amd.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7
Date: Thu, 21 Jan 2010 10:58:01 +1300 [thread overview]
Message-ID: <29111.1264024681@neuling.org> (raw)
In-Reply-To: <1264020517.4283.1117.camel@laptop>
> > On Power7 processors running in SMT4 mode with 2, 3, or 4 idle threads
> > there is performance benefit to idling the higher numbered threads in
> > the core.
>
> So this is an actual performance improvement, not only power savings?
It's primarily a performance improvement. Any power/energy savings
would be a bonus.
Mikey
next prev parent reply other threads:[~2010-01-20 21:58 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 20:00 [PATCH 0/2] sched: arch_scale_smt_powers Joel Schopp
2010-01-20 20:00 ` Joel Schopp
2010-01-20 20:02 ` [PATCH 1/2] sched: Fix the place where group powers are updated Joel Schopp
2010-01-20 20:02 ` Joel Schopp
2010-01-21 13:54 ` [tip:sched/core] " tip-bot for Gautham R Shenoy
2010-01-26 23:28 ` [PATCHv2 1/2] sched: enable ARCH_POWER Joel Schopp
2010-01-26 23:28 ` Joel Schopp
2010-01-28 23:20 ` [PATCHv3 " Joel Schopp
2010-01-28 23:20 ` Joel Schopp
2010-02-05 20:57 ` [PATCHv4 " Joel Schopp
2010-02-05 20:57 ` Joel Schopp
2010-01-20 20:04 ` [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7 Joel Schopp
2010-01-20 20:04 ` Joel Schopp
2010-01-20 20:48 ` Peter Zijlstra
2010-01-20 20:48 ` Peter Zijlstra
2010-01-20 21:58 ` Michael Neuling [this message]
2010-01-20 21:58 ` Michael Neuling
2010-01-20 22:44 ` Joel Schopp
2010-01-20 22:44 ` Joel Schopp
2010-01-21 8:27 ` Peter Zijlstra
2010-01-21 8:27 ` Peter Zijlstra
2010-01-20 21:04 ` Michael Neuling
2010-01-20 21:04 ` Michael Neuling
2010-01-20 22:09 ` Joel Schopp
2010-01-20 22:09 ` Joel Schopp
2010-01-24 3:00 ` Benjamin Herrenschmidt
2010-01-24 3:00 ` Benjamin Herrenschmidt
2010-01-25 17:50 ` Joel Schopp
2010-01-25 17:50 ` Joel Schopp
2010-01-26 4:23 ` Benjamin Herrenschmidt
2010-01-26 4:23 ` Benjamin Herrenschmidt
2010-01-20 21:33 ` Benjamin Herrenschmidt
2010-01-20 21:33 ` Benjamin Herrenschmidt
2010-01-20 22:36 ` Joel Schopp
2010-01-20 22:36 ` Joel Schopp
2010-01-26 23:28 ` [PATCHv2 " Joel Schopp
2010-01-26 23:28 ` Joel Schopp
2010-01-27 0:52 ` Benjamin Herrenschmidt
2010-01-27 0:52 ` Benjamin Herrenschmidt
2010-01-28 22:39 ` Joel Schopp
2010-01-28 22:39 ` Joel Schopp
2010-01-29 1:23 ` Benjamin Herrenschmidt
2010-01-29 1:23 ` Benjamin Herrenschmidt
2010-01-28 23:20 ` [PATCHv3 " Joel Schopp
2010-01-28 23:20 ` Joel Schopp
2010-01-28 23:24 ` Joel Schopp
2010-01-28 23:24 ` Joel Schopp
2010-01-29 1:23 ` Benjamin Herrenschmidt
2010-01-29 1:23 ` Benjamin Herrenschmidt
2010-01-29 10:13 ` Peter Zijlstra
2010-01-29 10:13 ` Peter Zijlstra
2010-01-29 18:34 ` Joel Schopp
2010-01-29 18:34 ` Joel Schopp
2010-01-29 18:41 ` Joel Schopp
2010-01-29 18:41 ` Joel Schopp
2010-02-05 20:57 ` [PATCHv4 " Joel Schopp
2010-02-05 20:57 ` Joel Schopp
2010-02-14 10:12 ` Peter Zijlstra
2010-02-14 10:12 ` Peter Zijlstra
2010-02-17 22:20 ` Michael Neuling
2010-02-17 22:20 ` Michael Neuling
2010-02-18 13:17 ` Peter Zijlstra
2010-02-18 13:17 ` Peter Zijlstra
2010-02-18 13:19 ` Peter Zijlstra
2010-02-18 13:19 ` Peter Zijlstra
2010-02-18 16:28 ` Joel Schopp
2010-02-18 16:28 ` Joel Schopp
2010-02-18 17:08 ` Peter Zijlstra
2010-02-18 17:08 ` Peter Zijlstra
2010-02-19 6:05 ` Michael Neuling
2010-02-19 6:05 ` Michael Neuling
2010-02-19 10:01 ` Peter Zijlstra
2010-02-19 10:01 ` Peter Zijlstra
2010-02-19 11:01 ` Michael Neuling
2010-02-19 11:01 ` Michael Neuling
2010-02-23 6:08 ` Michael Neuling
2010-02-23 6:08 ` Michael Neuling
2010-02-23 16:24 ` Peter Zijlstra
2010-02-23 16:24 ` Peter Zijlstra
2010-02-23 16:30 ` Peter Zijlstra
2010-02-23 16:30 ` Peter Zijlstra
2010-02-24 6:07 ` Michael Neuling
2010-02-24 6:07 ` Michael Neuling
2010-02-24 11:13 ` Michael Neuling
2010-02-24 11:13 ` Michael Neuling
2010-02-24 11:58 ` Michael Neuling
2010-02-24 11:58 ` Michael Neuling
2010-02-27 10:21 ` Michael Neuling
2010-02-27 10:21 ` Michael Neuling
2010-03-02 14:44 ` Peter Zijlstra
2010-03-02 14:44 ` Peter Zijlstra
2010-03-04 22:28 ` Michael Neuling
2010-03-04 22:28 ` Michael Neuling
2010-01-29 12:25 ` [PATCHv3 " Gabriel Paubert
2010-01-29 12:25 ` Gabriel Paubert
2010-01-29 16:26 ` Joel Schopp
2010-01-29 16:26 ` Joel Schopp
2010-01-26 23:27 ` [PATCHv2 0/2] sched: arch_scale_smt_powers v2 Joel Schopp
2010-01-26 23:27 ` Joel Schopp
2010-01-28 23:20 ` [PATCHv3 0/2] sched: arch_scale_smt_powers Joel Schopp
2010-01-28 23:20 ` Joel Schopp
2010-02-05 20:57 ` [PATCHv4 " Joel Schopp
2010-02-05 20:57 ` Joel Schopp
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