From: William Lee Irwin III <wli@holomorphy.com>
To: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Andrew Morton <akpm@digeo.com>,
lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: 2.5.38-mm3
Date: Thu, 26 Sep 2002 06:17:40 -0700 [thread overview]
Message-ID: <20020926131740.GP3530@holomorphy.com> (raw)
In-Reply-To: <20020926183558.D18906@in.ibm.com>
On Thu, Sep 26, 2002 at 05:42:44AM -0700, William Lee Irwin III wrote:
>> This is only aggravated by cacheline bouncing on SMP. The reductions
>> of system cpu time will doubtless be beneficial for all.
On Thu, Sep 26, 2002 at 06:35:58PM +0530, Dipankar Sarma wrote:
> On SMP, I would have thought that only sharing the fd table
> while cloning tasks (CLONE_FILES) affects performance by bouncing the rwlock
> cache line. Are there a lot of common workloads where this happens ?
> Anyway the files_struct_rcu patch for 2.5.38 is up at
> http://sourceforge.net/project/showfiles.php?group_id=8875&release_id=112473
It looks very unusual, but it is very real. Some of my prior profile
results show this. I'll run a before/after profile with this either
tonight or tomorrow night (it's 6:06AM PST here -- tonight is unlikely).
Cheers,
Bill
WARNING: multiple messages have this Message-ID (diff)
From: William Lee Irwin III <wli@holomorphy.com>
To: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Andrew Morton <akpm@digeo.com>,
lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: 2.5.38-mm3
Date: Thu, 26 Sep 2002 06:17:40 -0700 [thread overview]
Message-ID: <20020926131740.GP3530@holomorphy.com> (raw)
In-Reply-To: <20020926183558.D18906@in.ibm.com>
On Thu, Sep 26, 2002 at 05:42:44AM -0700, William Lee Irwin III wrote:
>> This is only aggravated by cacheline bouncing on SMP. The reductions
>> of system cpu time will doubtless be beneficial for all.
On Thu, Sep 26, 2002 at 06:35:58PM +0530, Dipankar Sarma wrote:
> On SMP, I would have thought that only sharing the fd table
> while cloning tasks (CLONE_FILES) affects performance by bouncing the rwlock
> cache line. Are there a lot of common workloads where this happens ?
> Anyway the files_struct_rcu patch for 2.5.38 is up at
> http://sourceforge.net/project/showfiles.php?group_id=8875&release_id=112473
It looks very unusual, but it is very real. Some of my prior profile
results show this. I'll run a before/after profile with this either
tonight or tomorrow night (it's 6:06AM PST here -- tonight is unlikely).
Cheers,
Bill
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/
next prev parent reply other threads:[~2002-09-26 13:12 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-26 7:57 2.5.38-mm3 Andrew Morton
2002-09-26 7:57 ` 2.5.38-mm3 Andrew Morton
2002-09-26 12:24 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:24 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:29 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 12:29 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 12:40 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:40 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:42 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 12:42 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:05 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 13:05 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 13:17 ` William Lee Irwin III [this message]
2002-09-26 13:17 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:29 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:29 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:39 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:39 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:46 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:46 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-27 8:27 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 8:27 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 9:20 ` 2.5.38-mm3 William Lee Irwin III
2002-09-27 9:20 ` 2.5.38-mm3 William Lee Irwin III
2002-09-27 9:58 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 9:58 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 15:04 ` 2.5.38-mm3 Martin J. Bligh
2002-09-27 15:04 ` 2.5.38-mm3 Martin J. Bligh
2002-09-27 17:14 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 17:14 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 22:54 ` 2.5.38-mm3 William Lee Irwin III
2002-09-27 22:54 ` 2.5.38-mm3 William Lee Irwin III
2002-09-28 5:41 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 5:41 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 4:35 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 4:35 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 4:36 ` 2.5.38-mm3 William Lee Irwin III
2002-09-28 4:36 ` 2.5.38-mm3 William Lee Irwin III
2002-09-28 4:54 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 4:54 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 5:29 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 5:29 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 4:30 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 4:30 ` 2.5.38-mm3 Zwane Mwaikambo
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