From: Andi Kleen <andi@firstfloor.org>
To: Trent Piepho <tpiepho@freescale.com>
Cc: Dave Jones <davej@redhat.com>,
netdev@vger.kernel.org, j.w.r.degoede@hhs.nl
Subject: Re: cat /proc/net/tcp takes 0.5 seconds on x86_64
Date: Thu, 28 Aug 2008 00:54:08 +0200 [thread overview]
Message-ID: <87k5e2qdbj.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080827214700.GB26610@one.firstfloor.org> (Andi Kleen's message of "Wed, 27 Aug 2008 23:47:00 +0200")
>>
>> Umm, 0.4 to 0.8 seconds is on average _slower_ than 0.44 seconds. Did you
>> mean .04 to .08?
>
> Yes noticed that too -- i think it must have been .04-.08 and the zeros
> got lost somewhere. I remember that it was significantly faster. It's really
> a benchmark how fast an read lock aquire/release is, but even on
> the best systems it's quite slow compared to lockless code.
FWIW I redid the benchmarks now and it's 0.046s (without) to 0.005s (with
patch) on a different 2GB Core2 system with nearly empty hash table.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-08-27 22:54 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-459782-176318@bugzilla.redhat.com>
[not found] ` <200808261549.m7QFnVUN032543@bz-web1.app.phx.redhat.com>
2008-08-26 16:37 ` cat /proc/net/tcp takes 0.5 seconds on x86_64 Dave Jones
2008-08-26 18:32 ` Eric Dumazet
2008-08-26 19:01 ` Hans de Goede
2008-08-26 20:39 ` Eric Dumazet
2008-08-26 20:58 ` Hans de Goede
2008-08-26 21:27 ` Eric Dumazet
2008-08-27 9:14 ` Hans de Goede
2008-08-27 9:05 ` David Miller
2008-08-27 9:45 ` Hans de Goede
2008-08-27 9:39 ` David Miller
2008-08-27 4:19 ` Herbert Xu
2008-08-27 9:07 ` Hans de Goede
2008-08-27 12:41 ` Andi Kleen
2008-08-27 21:29 ` Trent Piepho
2008-08-27 21:47 ` Andi Kleen
2008-08-27 22:54 ` Andi Kleen [this message]
2008-08-27 21:29 ` David Miller
2008-08-27 21:48 ` Stephen Hemminger
2008-08-27 22:09 ` David Miller
2008-08-28 6:20 ` Eric Dumazet
2008-08-28 6:51 ` David Miller
2008-08-28 7:13 ` Eric Dumazet
2008-08-28 7:57 ` David Miller
2008-08-28 9:52 ` Eric Dumazet
2008-08-28 7:26 ` Andi Kleen
2008-08-27 22:34 ` Andi Kleen
2008-08-27 22:39 ` David Miller
2008-08-27 22:57 ` Andi Kleen
2008-08-27 23:07 ` David Miller
2008-08-27 23:09 ` Eric Dumazet
2008-08-27 23:15 ` David Miller
2008-08-27 23:35 ` Andi Kleen
2008-08-27 23:43 ` Eric Dumazet
2008-08-27 23:45 ` David Miller
2008-08-28 0:40 ` Eric Dumazet
2008-08-28 7:45 ` Andi Kleen
2008-08-28 7:59 ` David Miller
2008-08-28 8:12 ` Hans de Goede
2008-08-28 8:04 ` David Miller
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