From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Herbert Subject: Re: rps perfomance WAS(Re: rps: question Date: Thu, 15 Apr 2010 23:28:42 -0700 Message-ID: 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> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Eric Dumazet , hadi@cyberus.ca, Rick Jones , David Miller , netdev@vger.kernel.org, robert@herjulf.net, andi@firstfloor.org To: Changli Gao Return-path: Received: from smtp-out.google.com ([74.125.121.35]:19829 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754020Ab0DPG2r convert rfc822-to-8bit (ORCPT ); Fri, 16 Apr 2010 02:28:47 -0400 Received: from kpbe17.cbf.corp.google.com (kpbe17.cbf.corp.google.com [172.25.105.81]) by smtp-out.google.com with ESMTP id o3G6Si1M006595 for ; Fri, 16 Apr 2010 08:28:45 +0200 Received: from pvg4 (pvg4.prod.google.com [10.241.210.132]) by kpbe17.cbf.corp.google.com with ESMTP id o3G6ShED009830 for ; Thu, 15 Apr 2010 23:28:43 -0700 Received: by pvg4 with SMTP id 4so1624448pvg.37 for ; Thu, 15 Apr 2010 23:28:43 -0700 (PDT) In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: >> How do you wake up a thread on a remote cpu ? >> > > resched IPI, apparently. But it is async absolutely. and its IRQ > handler is lighter. > The IPI used in RPS is done asynchronously. > -- > Regards=EF=BC=8C > Changli Gao(xiaosuo@gmail.com) >