linux-kernel - Re: seq_file: Use larger buffer to reduce time traversing lists

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Message-ID: <1338554890.2760.1517.camel@edumazet-glaptop>
Date:	Fri, 01 Jun 2012 14:48:10 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Steven Whitehouse <swhiteho@...hat.com>
Cc:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com,
	Al Viro <viro@...iv.linux.org.uk>, nstraz@...hat.com
Subject: Re: seq_file: Use larger buffer to reduce time traversing lists

On Fri, 2012-06-01 at 13:24 +0100, Steven Whitehouse wrote:

> Yes, you are right that it will be slow, still. But I'm not sure what we
> can do about that. We have to find our place again on each read call, in
> any case I think.

You dont really answer my question, I asked the exact timing...

I can't reproduce this slow behavior you have, using /proc/net seq
files.

Isn't it a problem with this particular file ?

Does it want to output a single record ( m->op->show(m, p) ) much larger
than 4KB ?



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