From: Sean Hunter <sean@dev.sportingbet.com>
To: Sven Rudolph <rudsve@drewag.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.2 -> 2.4: /proc/net/tcp 10x slower ?
Date: Mon, 26 Feb 2001 14:42:09 +0000 [thread overview]
Message-ID: <20010226144209.A3379@dev.sportingbet.com> (raw)
In-Reply-To: <xfkelwlo7ny.fsf@uxrs2.drewag.de>
In-Reply-To: <xfkelwlo7ny.fsf@uxrs2.drewag.de>; from rudsve@drewag.de on Mon, Feb 26, 2001 at 03:12:01PM +0100
The identd wot I wrote is still fast as anything on 2.4 :)
As you can see from this teeny sample of my ident log, I take just a little
over 1/100th of a second to respond (on average). :)
2001-02-25 16:18:35.714731500 Q [194.75.152.225] - [32907, 25]
2001-02-25 16:18:35.726085500 A [194.75.152.225] - [9a0c62e79c0df893bb96dd74/3a99305b/b0164] for [32907, 25] UID [506]
2001-02-26 09:41:02.535514500 Q [195.92.249.252] - [33363, 21]
2001-02-26 09:41:02.548884500 A [195.92.249.252] - [8c0babd7b8ab6830b7092839/3a9a24ae/8454c] for [33363, 21] UID [500]
By the way, the intention of my ident server was not to be fast, but just to be
a little simpler and less over-engineered than pidentd, and not to give out any
site-specific information (uid's etc). The speed was a bonus.
Sean
On Mon, Feb 26, 2001 at 03:12:01PM +0100, Sven Rudolph wrote:
> Usually identd's on Linux parse /proc/net/tcp.
>
> When migrating from Linux 2.2.17 to 2.4.2 identd became much slower.
>
> I traced it back to the point where /proc/net/tcp is read.
>
> On the same slightly loaded system:
>
> 2.2.17 $ time cat /proc/net/tcp >/dev/null
> real 0m0.004s
> user 0m0.000s
> sys 0m0.010s
>
> (Or sometimes 0.000s due to granularity)
>
> 2.2.17 $ time cat /proc/net/tcp >/dev/null
> real 0m0.083s
> user 0m0.000s
> sys 0m0.080s
>
>
> Is this expected? Or is there a more efficient interface that identd
> should use?
>
> Sven
>
> -
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prev parent reply other threads:[~2001-02-26 14:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-26 14:12 2.2 -> 2.4: /proc/net/tcp 10x slower ? Sven Rudolph
2001-02-26 14:42 ` Sean Hunter [this message]
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