From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Ulrich Drepper <drepper@gmail.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@suse.de>,
Ravikiran G Thirumalai <kiran@scalex86.org>,
"Shai Fultheim (Shai@scalex86.org)" <shai@scalex86.org>,
pravin b shelar <pravin.shelar@calsoftinc.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] FUTEX : introduce private hashtables
Date: Fri, 16 Mar 2007 08:29:05 +1100 [thread overview]
Message-ID: <45F9BAA1.9040803@yahoo.com.au> (raw)
In-Reply-To: <a36005b50703151409x311c2631n1bc10de67b6c6ede@mail.gmail.com>
Ulrich Drepper wrote:
> On 3/15/07, Nick Piggin <nickpiggin@yahoo.com.au> wrote:
>
>> There should be little contention on the memory in the global hash
>> anyway,
>> because we can roughly reduce contention as a factor of
>> hash-size/cacheline-size.
>>
>> What we will have are cache misses on the global table... but we're
>> going to
>> get cache misses on those private tables as well.
>
>
> I'm thinking about NUMA cases. If you have private tables for a
> process which is pinned to some cluster in a NUMA machine the table is
> local to the node. If you have a global table you cannot optimize
> your application for such a situation because at least some of the
> pages of the global table are remote.
>
That's true, but it also might be able to be improved in other ways.
At least once we get the basic support in the kernel, and glibc picks
it up, then we have a better base to evaluate these more exotic changes
against.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2007-03-15 21:29 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-08 7:07 [RFC] NUMA futex hashing Ravikiran G Thirumalai
2006-08-08 9:14 ` Eric Dumazet
2006-08-08 20:31 ` Ravikiran G Thirumalai
2006-08-08 9:37 ` Jes Sorensen
2006-08-08 9:58 ` Andi Kleen
2006-08-08 10:07 ` Jes Sorensen
2006-08-08 9:57 ` Andi Kleen
2006-08-08 10:10 ` Eric Dumazet
2006-08-08 10:36 ` Andi Kleen
2006-08-08 12:29 ` Eric Dumazet
2006-08-08 12:47 ` Andi Kleen
2006-08-08 12:57 ` Eric Dumazet
2006-08-08 14:39 ` Ulrich Drepper
2006-08-08 15:11 ` Nick Piggin
2006-08-08 15:36 ` Ulrich Drepper
2006-08-08 16:22 ` Nick Piggin
2006-08-08 16:26 ` Nick Piggin
2006-08-08 16:49 ` Ulrich Drepper
2006-08-08 16:08 ` Eric Dumazet
2006-08-08 16:34 ` Nick Piggin
2006-08-08 16:49 ` Eric Dumazet
2006-08-08 16:59 ` Eric Dumazet
2006-08-09 1:56 ` Nick Piggin
2006-08-08 16:58 ` Ulrich Drepper
2006-08-08 17:08 ` Eric Dumazet
2006-08-09 1:58 ` Nick Piggin
2006-08-09 6:26 ` Eric Dumazet
2006-08-09 6:43 ` Eric Dumazet
2007-03-15 19:10 ` [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements Eric Dumazet
2007-03-15 20:15 ` Nick Piggin
2007-03-16 8:05 ` Peter Zijlstra
2007-03-16 9:30 ` Eric Dumazet
2007-03-16 10:10 ` Peter Zijlstra
2007-03-16 10:30 ` Eric Dumazet
2007-03-16 10:36 ` Peter Zijlstra
2007-04-04 7:16 ` Ulrich Drepper
2007-04-05 17:49 ` [PATCH] FUTEX : new PRIVATE futexes Eric Dumazet
2007-04-05 20:43 ` Ulrich Drepper
2007-04-06 1:19 ` Nick Piggin
2007-04-06 5:53 ` Eric Dumazet
2007-04-06 11:50 ` Nick Piggin
2007-04-06 6:05 ` Hugh Dickins
2007-04-06 17:41 ` Jan Engelhardt
2007-04-06 12:26 ` Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes) Peter Zijlstra
2007-04-06 13:02 ` Hugh Dickins
2007-04-06 13:15 ` Peter Zijlstra
2007-04-06 13:15 ` Nick Piggin
2007-04-06 13:22 ` Peter Zijlstra
2007-04-06 13:40 ` Nick Piggin
2007-04-06 12:31 ` [PATCH] FUTEX : new PRIVATE futexes Peter Zijlstra
2007-04-07 8:43 ` [PATCH, take4] " Eric Dumazet
2007-04-07 9:30 ` Nick Piggin
2007-04-07 10:00 ` Eric Dumazet
2007-04-11 7:22 ` Nick Piggin
2007-04-11 8:14 ` Eric Dumazet
2007-04-11 9:23 ` Nick Piggin
2007-04-11 9:30 ` Pierre Peiffer
2007-04-11 9:39 ` Nick Piggin
2007-04-11 9:40 ` Nick Piggin
2007-04-11 9:35 ` Eric Dumazet
2007-04-12 1:57 ` Nick Piggin
2007-04-07 11:18 ` Jakub Jelinek
2007-04-07 11:54 ` Eric Dumazet
2007-04-07 16:40 ` Ulrich Drepper
2007-04-07 22:15 ` Andrew Morton
2007-04-10 9:21 ` Eric Dumazet
2007-04-11 9:19 ` [PATCH, take5] " Eric Dumazet
2007-04-11 12:23 ` Rusty Russell
2007-04-26 12:55 ` [PATCH, take6] " Eric Dumazet
2007-04-26 13:35 ` Pierre Peiffer
2007-03-15 19:13 ` [PATCH 1/3] FUTEX : introduce PROCESS_PRIVATE semantic Eric Dumazet
2007-03-15 19:16 ` [PATCH 2/3] FUTEX : introduce private hashtables Eric Dumazet
2007-03-15 20:25 ` Nick Piggin
2007-03-15 21:09 ` Ulrich Drepper
2007-03-15 21:29 ` Nick Piggin [this message]
2007-03-15 22:59 ` William Lee Irwin III
2007-03-15 19:20 ` [PATCH 3/3] FUTEX : NUMA friendly global hashtable Eric Dumazet
2006-08-09 0:13 ` [RFC] NUMA futex hashing Ravikiran G Thirumalai
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