From: Andi Kleen <andi@firstfloor.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Nick Piggin <nickpiggin@yahoo.com.au>,
Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls
Date: Wed, 6 Aug 2008 05:37:36 +0200 [thread overview]
Message-ID: <20080806033736.GB24801@one.firstfloor.org> (raw)
In-Reply-To: <48991B84.2080704@goop.org>
On Tue, Aug 05, 2008 at 08:33:24PM -0700, Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> >Jeremy Fitzhardinge <jeremy@goop.org> writes:
> >
> >
> >>1. use smp_call_function_mask to implement cross-cpu TLB flushes
> >>
> >
> >
> >Do you have any measurements comparing performance of the old and
> >the new call? TLB flush is quite time critical so we should be very
> >careful here.
>
> No. What benchmark would you suggest?
Micro benchmark. Just stick RDTSC around the calls and trigger
a few remote flushes by e.g. doing mmap/munmap on a multithreaded program
running on different CPUs.
-Andi
next prev parent reply other threads:[~2008-08-06 3:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-02 0:14 [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 1 of 8] x86-32: use smp_call_function_mask for SMP TLB invalidations Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 2 of 8] x86-64: " Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 3 of 8] x86: make tlb_32|64 closer Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 4 of 8] x86: unify tlb.c Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 5 of 8] smp_function_call: add multiple queues for scalability Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 6 of 8] x86: add multiple smp_call_function queues Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 7 of 8] x86: make number of smp_call_function queues truely configurable Jeremy Fitzhardinge
2008-08-02 0:14 ` [PATCH 8 of 8] smp function calls: add kernel parameter to disable multiple queues Jeremy Fitzhardinge
2008-08-06 3:22 ` [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls Andi Kleen
2008-08-06 3:33 ` Jeremy Fitzhardinge
2008-08-06 3:37 ` Andi Kleen [this message]
2008-08-11 23:57 ` Jeremy Fitzhardinge
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