From: Ingo Molnar <mingo@kernel.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
rjw@rjwysocki.net, peterz@infradead.org, x86@kernel.org,
bp@suse.de, sudeep.holla@arm.com, ak@linux.intel.com,
linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
alexey.klimov@arm.com, viresh.kumar@linaro.org,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
lenb@kernel.org, paul.gortmaker@windriver.com,
jpoimboe@redhat.com, mcgrof@kernel.org, jgross@suse.com,
robert.moore@intel.com, dvyukov@google.com, jeyu@redhat.com,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 04/11] sched,x86: Enable Turbo Boost Max Technology
Date: Wed, 24 Aug 2016 20:08:54 +0200 [thread overview]
Message-ID: <20160824180854.GA1398@gmail.com> (raw)
In-Reply-To: <20160824175057.GA5032@linux.intel.com>
* Tim Chen <tim.c.chen@linux.intel.com> wrote:
> Ingo,
>
> This feature will be a clear benefit for client machines and
> less clear on servers.
>
> This feature is most beneficial to single threaded workload running on
> a single socket that operates in mostly Turbo mode. Client platform
> like Broadwell High End Desktop is the first one that supports it.
> Enablng this feature for such platform by default will be a win as it
> runs single threaded workload much of the time (10%-15% peformance
> upside).
>
> On the other hand, a heavily loaded server that rarely operates in Turbo
> mode will benefit much less from this feature. There is some overhead
> incurred by migrating load to the favored cores. Some server folks
> have asked us to be cautious here and not to turn on ITMT scheduling
> by default. Even so, when the server is lightly loaded, this feature
> can still be a win. That said, this is future looking as we don't have
> any server with this feature today.
>
> So if we take the approach to enable this feature by default for only
> single node system (using that as a criteria for client), will that seem
> reasonable to you?
I suppose that would work. Peter, any objections to such an approach?
Thanks,
Ingo
next prev parent reply other threads:[~2016-08-24 18:08 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-18 22:36 [PATCH 00/11] Support Intel® Turbo Boost Max Technology 3.0 Srinivas Pandruvada
2016-08-18 22:36 ` [PATCH 01/11] sched, cpuset: Add regenerate_sched_domains function to rebuild all sched domains Srinivas Pandruvada
2016-08-22 13:52 ` Morten Rasmussen
2016-08-22 19:51 ` Tim Chen
2016-08-18 22:36 ` [PATCH 02/11] sched, x86: Add SD_ASYM_PACKING flags to x86 cpu topology for cpus supporting Intel Turbo Boost Max Technology Srinivas Pandruvada
2016-08-18 22:36 ` [PATCH 03/11] sched: Extend scheduler's asym packing Srinivas Pandruvada
2016-08-25 11:22 ` Morten Rasmussen
2016-08-25 11:45 ` Peter Zijlstra
2016-08-25 13:18 ` Morten Rasmussen
2016-08-25 13:45 ` Peter Zijlstra
2016-08-26 10:39 ` Morten Rasmussen
2016-08-26 12:42 ` Peter Zijlstra
2016-08-26 17:25 ` Tim Chen
2016-08-26 23:14 ` Tim Chen
2016-08-18 22:36 ` [PATCH 04/11] sched,x86: Enable Turbo Boost Max Technology Srinivas Pandruvada
2016-08-22 9:01 ` kbuild test robot
2016-08-22 19:04 ` Tim Chen
2016-08-24 10:18 ` Ingo Molnar
2016-08-24 17:50 ` Tim Chen
2016-08-24 18:08 ` Ingo Molnar [this message]
2016-08-24 18:22 ` Peter Zijlstra
2016-08-18 22:36 ` [PATCH 05/11] acpi: cppc: Allow build with ACPI_CPU_FREQ_PSS config Srinivas Pandruvada
2016-08-20 0:46 ` Rafael J. Wysocki
2016-08-18 22:36 ` [PATCH 06/11] acpi: cpcc: Add integer read support Srinivas Pandruvada
2016-08-18 22:36 ` [PATCH 07/11] acpi: cppc: Add support for function fixed hardware address Srinivas Pandruvada
2016-08-20 0:49 ` Rafael J. Wysocki
2016-08-18 22:36 ` [PATCH 08/11] acpi: cppc: Add prefix cppc to cpudata structure name Srinivas Pandruvada
2016-08-18 22:36 ` [PATCH 09/11] acpi: bus: Enable HWP CPPC objects Srinivas Pandruvada
2016-08-20 0:49 ` Rafael J. Wysocki
2016-08-18 22:36 ` [PATCH 10/11] acpi: bus: Set _OSC for diverse core support Srinivas Pandruvada
2016-08-20 0:51 ` Rafael J. Wysocki
2016-08-18 22:36 ` [PATCH 11/11] cpufreq: intel_pstate: Use CPPC to get max performance Srinivas Pandruvada
2016-08-22 11:59 ` kbuild test robot
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