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.
next prev parent 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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