netdev - Re: [PATCH] ipv6/addrconf: speedup /proc/net/if

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Date:	Wed, 04 Jan 2012 16:01:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mihai.maruseac@...il.com
Cc:	eric.dumazet@...il.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	mmaruseac@...acom.com, dbaluta@...acom.com
Subject: Re: [PATCH] ipv6/addrconf: speedup /proc/net/if_inet6 filling

From: Mihai Maruseac <mihai.maruseac@...il.com>
Date: Wed,  4 Jan 2012 11:31:35 +0200

> This ensures a linear behaviour when filling /proc/net/if_inet6 thus making
> ifconfig run really fast on IPv6 only addresses. In fact, with this patch and
> the IPv4 one sent a while ago, ifconfig will run in linear time regardless of
> address type.
> 
> IPv4 related patch: f04565ddf52e401880f8ba51de0dff8ba51c99fd
> 	 dev: use name hash for dev_seq_ops
> 	 ...
> 
> Some statistics (running ifconfig > /dev/null on a different setup):
> 
> iface count / IPv6 no-patch time / IPv6 patched time / IPv4 time
> ----------------------------------------------------------------
>       6250  |       0.23 s       |      0.13 s       |  0.11 s
>      12500  |       0.62 s       |      0.28 s       |  0.22 s
>      25000  |       2.91 s       |      0.57 s       |  0.46 s
>      50000  |      11.37 s       |      1.21 s       |  0.94 s
>     128000  |      86.78 s       |      3.05 s       |  2.54 s
> 
> Signed-off-by: Mihai Maruseac <mmaruseac@...acom.com>
> Cc: Daniel Baluta <dbaluta@...acom.com>

Applied, thanks.
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