From: Daniel Jordan <daniel.m.jordan@oracle.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>,
Josh Triplett <josh@joshtriplett.org>,
Andrew Morton <akpm@linux-foundation.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Steffen Klassert <steffen.klassert@secunet.com>,
Alex Williamson <alex.williamson@redhat.com>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Jonathan Corbet <corbet@lwn.net>,
Kirill Tkhai <ktkhai@virtuozzo.com>,
Michal Hocko <mhocko@kernel.org>, Pavel Machek <pavel@ucw.cz>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
Shile Zhang <shile.zhang@linux.alibaba.com>,
Tejun Heo <tj@kernel.org>, Zi Yan <ziy@nvidia.com>,
linux-crypto@vger.kernel.org, linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/7] mm: parallelize deferred_init_memmap()
Date: Wed, 6 May 2020 18:21:27 -0400 [thread overview]
Message-ID: <20200506222127.l3p2a2vjavwz2bdl@ca-dmjordan1.us.oracle.com> (raw)
In-Reply-To: <CAKgT0UdE1ex_aAyMeR3PWtVcmXL8cUtjqy0J8hLpnFm42yn82w@mail.gmail.com>
On Tue, May 05, 2020 at 07:55:43AM -0700, Alexander Duyck wrote:
> One question about this data. What is the power management
> configuration on the systems when you are running these tests? I'm
> just curious if CPU frequency scaling, C states, and turbo are
> enabled?
Yes, intel_pstate is loaded in active mode without hwp and with turbo enabled
(those power management docs are great by the way!) and intel_idle is in use
too.
> I ask because that is what I have seen usually make the
> difference in these kind of workloads as the throughput starts
> dropping off as you start seeing the core frequency lower and more
> cores become active.
If I follow, you're saying there's a chance performance would improve with the
above disabled, but how often would a system be configured that way? Even if
it were faster, the machine is configured how it's configured, or am I missing
your point?
next prev parent reply other threads:[~2020-05-06 22:22 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 20:11 [PATCH 0/7] padata: parallelize deferred page init Daniel Jordan
2020-04-30 20:11 ` [PATCH 1/7] padata: remove exit routine Daniel Jordan
2020-04-30 20:11 ` [PATCH 2/7] padata: initialize earlier Daniel Jordan
2020-04-30 20:11 ` [PATCH 3/7] padata: allocate work structures for parallel jobs from a pool Daniel Jordan
2020-04-30 20:11 ` [PATCH 4/7] padata: add basic support for multithreaded jobs Daniel Jordan
2020-04-30 20:11 ` [PATCH 5/7] mm: move zone iterator outside of deferred_init_maxorder() Daniel Jordan
2020-04-30 21:43 ` Alexander Duyck
2020-05-01 2:45 ` Daniel Jordan
2020-05-04 22:10 ` Alexander Duyck
2020-05-04 22:10 ` Alexander Duyck
2020-05-05 0:54 ` Daniel Jordan
2020-05-05 15:27 ` Alexander Duyck
2020-05-05 15:27 ` Alexander Duyck
2020-05-06 22:39 ` Daniel Jordan
2020-05-07 15:26 ` Alexander Duyck
2020-05-07 15:26 ` Alexander Duyck
2020-05-07 20:20 ` Daniel Jordan
2020-05-07 21:18 ` Alexander Duyck
2020-05-07 21:18 ` Alexander Duyck
2020-05-07 22:15 ` Daniel Jordan
2020-04-30 20:11 ` [PATCH 6/7] mm: parallelize deferred_init_memmap() Daniel Jordan
2020-05-04 22:33 ` Alexander Duyck
2020-05-04 22:33 ` Alexander Duyck
2020-05-04 23:38 ` Josh Triplett
2020-05-04 23:38 ` Josh Triplett
2020-05-05 0:40 ` Alexander Duyck
2020-05-05 0:40 ` Alexander Duyck
2020-05-05 1:48 ` Daniel Jordan
2020-05-05 2:09 ` Daniel Jordan
2020-05-05 14:55 ` Alexander Duyck
2020-05-05 14:55 ` Alexander Duyck
2020-05-06 22:21 ` Daniel Jordan [this message]
2020-05-06 22:36 ` Alexander Duyck
2020-05-06 22:36 ` Alexander Duyck
2020-05-06 22:43 ` Daniel Jordan
2020-05-06 23:01 ` Daniel Jordan
2020-05-05 1:26 ` Daniel Jordan
2020-04-30 20:11 ` [PATCH 7/7] padata: document multithreaded jobs Daniel Jordan
2020-04-30 21:31 ` [PATCH 0/7] padata: parallelize deferred page init Andrew Morton
2020-04-30 21:40 ` Pavel Tatashin
2020-04-30 21:40 ` Pavel Tatashin
2020-05-01 2:40 ` Daniel Jordan
2020-05-01 0:50 ` Josh Triplett
2020-05-01 1:09 ` Josh Triplett
2020-05-01 2:48 ` Daniel Jordan
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