From: Paolo Bonzini <pbonzini@redhat.com>
To: Denys Vlasenko <dvlasenk@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Andy Lutomirski" <luto@amacapital.net>,
"Sara Sharon" <sara.sharon@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Christian König" <christian.koenig@amd.com>,
"Vinod Koul" <vinod.koul@intel.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Johannes Berg" <johannes.berg@intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
"Andy Lutomirski" <luto@kernel.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Adrian Hunter" <adrian.hunter@intel.com>
Subject: Re: RFC: Petition Intel/AMD to add POPF_IF insn
Date: Thu, 18 Aug 2016 19:22:16 +0200 [thread overview]
Message-ID: <0ad8824d-7e4a-6c72-43e0-9ecf7a43f86e@redhat.com> (raw)
In-Reply-To: <5174a3b9-7f48-49f4-c59f-0fa234b68b17@redhat.com>
On 18/08/2016 14:18, Denys Vlasenko wrote:
>
> - 2,588,839,023 branches # 977.555
> M/sec ( +- 0.02% )
> + 2,599,319,615 branches # 1046.786
> M/sec ( +- 0.04% )
> - 3,620,273 branch-misses # 0.14% of all
> branches ( +- 0.67% )
> + 3,577,771 branch-misses # 0.14% of all
> branches ( +- 0.69% )
> - 2.648799072 seconds time
> elapsed ( +- 0.24% )
> + 2.487452268 seconds time
> elapsed ( +- 0.31% )
>
> Good, we run more insns/cycle, as expected. However, a bit more branches.
Can you see where the missed branches are? Assuming branch misses are
the case where IF=0, perhaps there are a few places that can be changed
to spin_lock/unlock_irq or local_irq_disable/enable.
Paolo
next prev parent reply other threads:[~2016-08-19 2:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 17:20 Denys Vlasenko
2016-08-17 17:30 ` Christian König
2016-08-17 18:34 ` Denys Vlasenko
2016-08-17 17:32 ` Linus Torvalds
2016-08-17 18:41 ` Denys Vlasenko
[not found] ` <CA+55aFwmxwQBkyDjombS4cy1q=a_buhmDjDnaa8rdC8ZDaDYEA@mail.gmail.com>
2016-08-17 19:13 ` Andy Lutomirski
2016-08-17 19:26 ` Denys Vlasenko
2016-08-17 19:32 ` Linus Torvalds
2016-08-17 19:35 ` Denys Vlasenko
2016-08-17 19:54 ` Linus Torvalds
2016-08-17 19:37 ` Linus Torvalds
2016-08-17 21:26 ` Linus Torvalds
2016-08-17 21:35 ` Linus Torvalds
2016-08-17 21:43 ` Andy Lutomirski
2016-08-17 21:48 ` Linus Torvalds
2016-08-18 13:26 ` Denys Vlasenko
2016-08-18 17:24 ` Linus Torvalds
2016-08-18 17:47 ` Denys Vlasenko
2016-08-18 17:49 ` Denys Vlasenko
2016-08-19 10:54 ` Paolo Bonzini
2016-08-31 11:12 ` Denys Vlasenko
2016-08-18 9:21 ` Denys Vlasenko
2016-08-18 12:18 ` Denys Vlasenko
2016-08-18 17:22 ` Paolo Bonzini [this message]
2016-08-17 19:29 ` Linus Torvalds
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