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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: woofwoof@hathway.com, Andrew Morton <akpm@digeo.com>
Cc: dipankar@in.ibm.com, Maneesh Soni <maneesh@in.ibm.com>,
	Al Viro <viro@math.psu.edu>, LKML <linux-kernel@vger.kernel.org>,
	Anton Blanchard <anton@au1.ibm.com>,
	Paul McKenney <paul.mckenney@us.ibm.com>
Subject: Re: dcache_rcu [performance results]
Date: Mon, 04 Nov 2002 09:29:14 -0800	[thread overview]
Message-ID: <1025970000.1036430954@flay> (raw)
In-Reply-To: <20021102144306.A6736@dikhow>

> Clearly dcache_lock is the killer when 'ps' command is used in
> the benchmark. My guess (without looking at 'ps' code) is that
> it has to open/close a lot of files in /proc and that increases
> the number of acquisitions of dcache_lock. Increased # of acquisition
> add to cache line bouncing and contention.

Strace it - IIRC it does 5 opens per PID. Vomit.

M.


  reply	other threads:[~2002-11-04 17:28 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-10-30 10:49 [PATCH 2.5.44] dcache_rcu Maneesh Soni
2002-10-31 10:53 ` dcache_rcu [performance results] Dipankar Sarma
2002-11-02  1:36   ` Andrew Morton
2002-11-02  9:13     ` Dipankar Sarma
2002-11-04 17:29       ` Martin J. Bligh [this message]
2002-11-05  0:00         ` jw schultz
2002-11-05  1:14           ` ps performance sucks (was Re: dcache_rcu [performance results]) Martin J. Bligh
2002-11-05  3:57             ` Werner Almesberger
2002-11-05  4:42               ` Erik Andersen
2002-11-05  5:44                 ` Martin J. Bligh
2002-11-05  5:59                   ` Alexander Viro
2002-11-05  6:05                     ` Martin J. Bligh
2002-11-05  6:15                     ` Robert Love
2002-11-05  6:13                   ` Erik Andersen
2002-11-05  6:14                 ` Werner Almesberger
2002-11-05  4:26             ` jw schultz
2002-11-05  5:51               ` Martin J. Bligh
2002-11-05 19:57             ` Kai Henningsen
2002-11-05 21:33               ` Erik Andersen
2002-11-05 22:09             ` Karim Yaghmour
     [not found] <20021030161912.E2613@in.ibm.com.suse.lists.linux.kernel>
     [not found] ` <20021031162330.B12797@in.ibm.com.suse.lists.linux.kernel>
     [not found]   ` <3DC32C03.C3910128@digeo.com.suse.lists.linux.kernel>
     [not found]     ` <20021102144306.A6736@dikhow.suse.lists.linux.kernel>
2002-11-02 10:08       ` dcache_rcu [performance results] Andi Kleen
2002-11-02 10:54         ` Dipankar Sarma
2002-11-02 11:01           ` Andi Kleen
2002-11-02 19:41             ` Linus Torvalds
2002-11-02 21:16               ` Sam Ravnborg

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