From mboxrd@z Thu Jan 1 00:00:00 1970 From: jamal Subject: Re: rps perfomance WAS(Re: rps: question Date: Fri, 16 Apr 2010 09:42:05 -0400 Message-ID: <1271425325.4606.50.camel@bigi> References: <1271268242.16881.1719.camel@edumazet-laptop> <1271271222.4567.51.camel@bigi> <20100415.014857.168270765.davem@davemloft.net> <1271332528.4567.150.camel@bigi> <4BC741AE.3000108@hp.com> <1271362581.23780.12.camel@bigi> <1271395106.16881.3645.camel@edumazet-laptop> <1271399547.16881.3724.camel@edumazet-laptop> Reply-To: hadi@cyberus.ca Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Changli Gao , Rick Jones , David Miller , therbert@google.com, netdev@vger.kernel.org, robert@herjulf.net, andi@firstfloor.org To: Eric Dumazet Return-path: Received: from mail-qy0-f196.google.com ([209.85.221.196]:36918 "EHLO mail-qy0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757329Ab0DPNmH (ORCPT ); Fri, 16 Apr 2010 09:42:07 -0400 Received: by qyk34 with SMTP id 34so3294585qyk.22 for ; Fri, 16 Apr 2010 06:42:05 -0700 (PDT) In-Reply-To: <1271399547.16881.3724.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, 2010-04-16 at 08:32 +0200, Eric Dumazet wrote: > Le vendredi 16 avril 2010 =C3=A0 14:02 +0800, Changli Gao a =C3=A9cri= t : >=20 > > resched IPI, apparently. But it is async absolutely. and its IRQ > > handler is lighter. > >=20 >=20 > You still dont answer to the question, and your claims are not ground= ed > by hard facts, but by your interpretation of code. My understanding of current scheduler is it does use IPIs to migrate tasks around - so thats why things may be working for Changli. i.e it is scheduler magic if you use kthreads. It is hard to say if this would work better... cheers, jamal