From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Heffner Subject: Re: [PATCH] Bound TSO defer time (resend) Date: Tue, 17 Oct 2006 00:18:33 -0400 Message-ID: <45345999.4000300@psc.edu> References: <20061016202035.6d55b96e@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org Return-path: Received: from mailer2.psc.edu ([128.182.66.106]:55008 "EHLO mailer2.psc.edu") by vger.kernel.org with ESMTP id S1161139AbWJQESm (ORCPT ); Tue, 17 Oct 2006 00:18:42 -0400 To: Stephen Hemminger In-Reply-To: <20061016202035.6d55b96e@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Stephen Hemminger wrote: > On Mon, 16 Oct 2006 20:53:20 -0400 (EDT) > John Heffner wrote: >> This patch limits the amount of time you will defer sending a TSO segment >> to less than two clock ticks, or the time between two acks, whichever is >> longer. > > Okay, but doing any timing on clock ticks makes the behavior dependent > on the value of HZ which doesn't seem desirable. Should this be based > on RTT or a real-time values? It would be nice to use a high res clock so you don't depend on HZ, but this is still expensive on most SMP arch's as I understand it. -John