Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754919Ab1EQNEV (ORCPT ); Tue, 17 May 2011 09:04:21 -0400 Received: from mail-bw0-f46.google.com ([209.85.214.46]:50677 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754487Ab1EQNET (ORCPT ); Tue, 17 May 2011 09:04:19 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=PXKCjtdkOJeWEAeaNNVG2aHr5Y41qrbR2t2UCHxdp1ntU5p+0FUe9NPhqUDbFvFUx1 AnYBZE+ribxVajpZhcykEDXo5GlRMCwBdztZ8OAKahcx+fgEjXtTsOlZ1dZ7U4YE71LY Rqjl2lCda2PtH2UhkrtP4rDEKtxYU8dN2ilMo= Date: Tue, 17 May 2011 15:04:14 +0200 From: Tejun Heo To: Eric Dumazet Cc: Shaohua Li , "linux-kernel@vger.kernel.org" , "akpm@linux-foundation.org" , "cl@linux.com" , "npiggin@kernel.dk" Subject: Re: [patch V3] percpu_counter: scalability works Message-ID: <20110517130414.GO20624@htj.dyndns.org> References: <1305593751.2375.69.camel@sli10-conroe> <1305608212.9466.45.camel@edumazet-laptop> <1305609768.2375.84.camel@sli10-conroe> <1305622861.2850.21.camel@edumazet-laptop> <20110517091102.GE20624@htj.dyndns.org> <1305625541.2850.29.camel@edumazet-laptop> <20110517095001.GF20624@htj.dyndns.org> <1305634807.2850.89.camel@edumazet-laptop> <20110517124528.GN20624@htj.dyndns.org> <1305637223.2850.95.camel@edumazet-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1305637223.2850.95.camel@edumazet-laptop> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 631 Lines: 19 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/