From mboxrd@z Thu Jan 1 00:00:00 1970 From: "\"Oleg A. Arkhangelsky\"" Subject: Re: [PATCH NEXT 3/5] qlcnic: vlan lro support Date: Fri, 17 Sep 2010 11:34:46 +0400 Message-ID: <381611284708887@web110.yandex.ru> References: <1284642872-27832-1-git-send-email-amit.salecha@qlogic.com> <1284642872-27832-4-git-send-email-amit.salecha@qlogic.com> <1284643638.3352.30.camel@edumazet-laptop> <99737F4847ED0A48AECC9F4A1974A4B80F86F8005A@MNEXMB2.qlogic.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Amit Salecha Return-path: Received: from forward6.mail.yandex.net ([77.88.60.125]:49308 "EHLO forward6.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750826Ab0IQHlM (ORCPT ); Fri, 17 Sep 2010 03:41:12 -0400 In-Reply-To: <99737F4847ED0A48AECC9F4A1974A4B80F86F8005A@MNEXMB2.qlogic.org> Sender: netdev-owner@vger.kernel.org List-ID: 17.09.2010, 11:10, "Amit Salecha" : >> =C2=A0-----Original Message----- >> =C2=A0From: Eric Dumazet [mailto:eric.dumazet@gmail.com] >> =C2=A0Sent: Thursday, September 16, 2010 6:57 PM >> =C2=A0To: Amit Salecha >> =C2=A0Cc: davem@davemloft.net; netdev@vger.kernel.org; Ameen Rahman;= Anirban >> =C2=A0Chakraborty >> =C2=A0Subject: Re: [PATCH NEXT 3/5] qlcnic: vlan lro support >> >> =C2=A0Le jeudi 16 septembre 2010 =C3=A0 06:14 -0700, Amit Kumar Sale= cha a =C3=A9crit : >>> =C2=A0LRO + GRO + vlan rx accleration support, performance increase= s >>> =C2=A0around 20% and cpu utilization reduces around 70% on vlan int= erface. >> =C2=A0Interesting. What is the workload that demonstrates such gains= ? > > Just to demonstrate decrease in cpu utilization further: > I have taken numbers with various load. I used iperf application to r= un tcp traffic on vlan interface. > There is around 80-90% of reduction in cpu utilization. I'm wondering, how can this scale further. For example if I have 200K l= ow speed simultaneous TCP connections (router appliance case with many users). Can GRO give u= s some gain here? -- wbr, Oleg.