From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Andi Kleen <andi@firstfloor.org>,
Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH 0 of 9] x86/smp function calls: convert x86 tlb flushes to use function calls [POST 2]
Date: Tue, 19 Aug 2008 13:44:04 +0200 [thread overview]
Message-ID: <20080819114404.GA5354@elte.hu> (raw)
In-Reply-To: <200808192108.13338.nickpiggin@yahoo.com.au>
* Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> On Tuesday 19 August 2008 20:20, Ingo Molnar wrote:
> > * Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> > > I'm especially sore about mmap because I have a customer with a
> > > database that uses a lot of mmap/munmap and those calls have slowed
> > > down something like 50%(!!) from 2.6.early to 2.6.late.
> >
> > oh, agreed that it all needs to speed up - please send testcases ...
>
> I'm not sure if I can send the testcase I have. But this issue is
> coming to the top of my list to investigate in mainline, so I'll check
> out how we're doing here soon.
obviously having a repeatable testcase would jump-start any efforts to
fix this. It doesnt have to be complex - just a .c thing kernel
developers can run and get some quick number out of. A 50% regression
shouldnt be too hard to reproduce even with a vastly simplified
workload.
Ingo
next prev parent reply other threads:[~2008-08-19 11:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-18 18:23 [PATCH 0 of 9] x86/smp function calls: convert x86 tlb flushes to use function calls [POST 2] Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 1 of 9] x86: put tlb_flush_others() stats in debugfs Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 2 of 9] x86-32: use smp_call_function_mask for SMP TLB invalidations Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 3 of 9] x86-64: " Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 4 of 9] x86: make tlb_32|64 closer Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 5 of 9] x86: unify tlb.c Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 6 of 9] smp_function_call: add multiple queues for scalability Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 7 of 9] x86: add multiple smp_call_function queues Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 8 of 9] x86: make number of smp_call_function queues truely configurable Jeremy Fitzhardinge
2008-08-18 18:23 ` [PATCH 9 of 9] smp function calls: add kernel parameter to disable multiple queues Jeremy Fitzhardinge
2008-08-19 0:45 ` [PATCH 0 of 9] x86/smp function calls: convert x86 tlb flushes to use function calls [POST 2] Ingo Molnar
2008-08-19 1:28 ` Ingo Molnar
2008-08-19 6:18 ` Jeremy Fitzhardinge
2008-08-19 9:27 ` Ingo Molnar
2008-08-19 14:58 ` Jeremy Fitzhardinge
2008-08-19 9:45 ` Peter Zijlstra
2008-08-19 14:58 ` Jeremy Fitzhardinge
2008-08-19 5:37 ` Jeremy Fitzhardinge
2008-08-19 9:31 ` Ingo Molnar
2008-08-19 9:56 ` Nick Piggin
2008-08-19 10:20 ` Ingo Molnar
2008-08-19 11:08 ` Nick Piggin
2008-08-19 11:44 ` Ingo Molnar [this message]
2008-08-19 10:24 ` Ingo Molnar
2008-08-19 10:49 ` Nick Piggin
2008-08-19 10:31 ` Andi Kleen
2008-08-19 11:04 ` Nick Piggin
2008-08-19 11:20 ` Andi Kleen
2008-08-19 7:32 ` Andi Kleen
2008-08-19 7:44 ` Jeremy Fitzhardinge
2008-08-19 7:48 ` Andi Kleen
2008-08-19 8:04 ` Jeremy Fitzhardinge
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