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

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Date:	Fri, 01 Jun 2012 16:57:07 +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 15:18 +0100, Steven Whitehouse wrote:
> 	0m0.374s
> 
> So even with the current tcp scheme this appears to speed things up by
> nearly 3x. Also that was with only 28000 entries in the file,

Initial speedup was 100x, not 3x.

Of course using a 32KB buffer instead of 4KB will help.

And If someones need 100.000 active unix sockets and fast /proc/net/udp
file as well, patch is welcome. If I have time I can do it eventually.

Really, kmalloc(2 MB) is not going to happen, even using __GFP_NOWARN



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