netdev - Re: cat /proc/net/tcp takes 0.5 seconds on x86

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Message-Id: <20080827.160710.80433973.davem@davemloft.net>
Date:	Wed, 27 Aug 2008 16:07:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	davej@...hat.com, netdev@...r.kernel.org, j.w.r.degoede@....nl
Subject: Re: cat /proc/net/tcp takes 0.5 seconds on x86_64

From: Andi Kleen <andi@...stfloor.org>
Date: Thu, 28 Aug 2008 00:57:25 +0200

> David Miller <davem@...emloft.net> writes:
> 
> > From: Andi Kleen <andi@...stfloor.org>
> > Date: Thu, 28 Aug 2008 00:34:10 +0200
> >
> >> It fixes an old performance problem at least. I'm not aware 
> >> of any new ones in this area because the code in this 
> >> function hasn't changed since I last looked.
> >
> > That's exactly what this thread is about, things got slower for
> > some reason even though nothing specifically changed in this area.
> 
> I reread the original bug and it says nothing about a regression
> (unless I'm blind). I think the reporter just ran into the slowness that
> was pretty much always there[1] (and which my patch improves)

It's a regression compared to older kernels.  It got slower by a
factor of 5 or something like that.
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