From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Herbert Subject: Re: [RFC] ixgbe: is DCA really that good ? Date: Wed, 6 Apr 2011 08:24:16 -0700 Message-ID: References: <1302097444.3209.85.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Alexander Duyck , Brattain , Jeff Kirsher , netdev To: Eric Dumazet Return-path: Received: from smtp-out.google.com ([74.125.121.67]:2479 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756456Ab1DFPYU convert rfc822-to-8bit (ORCPT ); Wed, 6 Apr 2011 11:24:20 -0400 Received: from kpbe19.cbf.corp.google.com (kpbe19.cbf.corp.google.com [172.25.105.83]) by smtp-out.google.com with ESMTP id p36FOIlT014282 for ; Wed, 6 Apr 2011 08:24:19 -0700 Received: from pvh1 (pvh1.prod.google.com [10.241.210.193]) by kpbe19.cbf.corp.google.com with ESMTP id p36FOGdG005954 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NOT) for ; Wed, 6 Apr 2011 08:24:17 -0700 Received: by pvh1 with SMTP id 1so732539pvh.31 for ; Wed, 06 Apr 2011 08:24:16 -0700 (PDT) In-Reply-To: <1302097444.3209.85.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, Apr 6, 2011 at 6:44 AM, Eric Dumazet w= rote: > Hi guys > > > In a forwarding [or RPS/RFS] setup, why should we populate cpu caches > with full frames content ? We only need first cache line to perform > routing [or RPS/RFS] decision. > DCA + accelerated RFS might make good. But I agree that it should be configurable. > -> DCA should be a knob (ethtool ?) that an admin can switch off and = on, > port by port, not a CONFIG_IXGBE_DCA thing. > > Thanks > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =A0http://vger.kernel.org/majordomo-info.html >