netdev - Re: [PATCH net-next] tcp: tcp

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Message-ID: <1323020212.2762.147.camel@edumazet-laptop>
Date:	Sun, 04 Dec 2011 18:36:52 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tcp: tcp_sendmsg() page recycling

Le dimanche 04 décembre 2011 à 18:05 +0100, Eric Dumazet a écrit :
> If our TCP_PAGE(sk) is not shared (page_count() == 1), we can set page
> offset to 0.
> 
> This permits better filling of the pages on small to medium tcp writes.
> 
> "tbench 16" results on my dev server (2x4x2 machine) :
> 
> Before : 3072 MB/s
> After  : 3146 MB/s  (2.4 % gain)

By the way current linux tree on the same machine gets 2957 MB/s

So the combination of select_size() patch and this one gives
a 6.4 % gain.

Definitely worth the pain, isnt it ?



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