linux-kernel - Re: [patch V3] percpu_counter: scalability works

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Message-ID: <1305637223.2850.95.camel@edumazet-laptop>
Date:	Tue, 17 May 2011 15:00:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Shaohua Li <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"cl@...ux.com" <cl@...ux.com>,
	"npiggin@...nel.dk" <npiggin@...nel.dk>
Subject: Re: [patch V3] percpu_counter: scalability works

Le mardi 17 mai 2011 à 14:45 +0200, Tejun Heo a écrit :

> Given that _sum() is super-slow path and we have a lot of latitude
> there, 

Absolutely not. Its slow path yes, but not super-slow.

Dont change rules now ;)

Take a look at include/net/tcp.h and commit ad1af0fedba14f82b
(tcp: Combat per-cpu skew in orphan tests.)

If you guys make percpu_counter much slower, we'll just remove its use
in network stack, and there will be not a lot of users left.



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