netdev - Re: [PATCH 1/3] [UDP]: add udp_mem, udp_rmem_min and udp_wmem

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Message-Id: <20071231.041342.101160102.davem@davemloft.net>
Date:	Mon, 31 Dec 2007 04:13:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	haoki@...hat.com, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org, tyasui@...hat.com, mhiramat@...hat.com,
	satoshi.oshima.fk@...achi.com, billfink@...dspring.com,
	andi@...stfloor.org, johnpol@....mipt.ru,
	shemminger@...ux-foundation.org, yoshfuji@...ux-ipv6.org,
	yumiko.sugita.yf@...achi.com
Subject: Re: [PATCH 1/3] [UDP]: add udp_mem, udp_rmem_min and udp_wmem_min

From: Eric Dumazet <dada1@...mosbay.com>
Date: Mon, 31 Dec 2007 09:54:32 +0100

> Maybe I read the patch incorrectly, or we could add some new sysctl so that
> we not try to uncharge memory if a socket 'forward_alloc' is beyond a given 
> limit (say 2 pages), so that number of atomic_inc/dec on udp_memory_allocated 
> (or tcp_memory_allocated) is reduced.

This is what we should be striving for, using forward_alloc
as much as possible as a "cache" to avoid the atomics on
the global var as much as possible.
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