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

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Message-ID: <20110517130414.GO20624@htj.dyndns.org>
Date:	Tue, 17 May 2011 15:04:14 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
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

Hello,

On Tue, May 17, 2011 at 03:00:23PM +0200, Eric Dumazet wrote:
> Absolutely not. Its slow path yes, but not super-slow.

I was speaking in relative terms.  We're talking about local only fast
path vs. something which hits every percpu counter likely causing
cache misses in many of them.  It's bound to be multiple orders of
magnitude heavier than fast path.

Thanks.

-- 
tejun
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