From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: Network performance forwarding tests on RT Date: Fri, 7 Nov 2008 08:52:10 -0800 Message-ID: <20081107085210.67d4c962@extreme> References: <20081105115205.14c5282f@s6510> <20081106185029.0d4c5cd8@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "Clark Williams" , linux-rt-users@vger.kernel.org, netdev@vger.kernel.org To: "Tobias Knutsson" Return-path: Received: from mail.vyatta.com ([76.74.103.46]:44928 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751272AbYKGQwQ (ORCPT ); Fri, 7 Nov 2008 11:52:16 -0500 In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Fri, 7 Nov 2008 08:03:44 +0100 "Tobias Knutsson" wrote: > First off all, let me just say than I am relatively new to PREEMPT_RT and I > have no experience with Vyatta. It is just that some thoughts came to me > that might be useful to consider. > > What priorities does the network related threads have? There should be one > for the ISR and one each for the soft irq responsible for the receiving and > transmitting of network data. Maybe adjusting some of these priorities could > improve the situation. What ever the default is, nothing was changed. Remember for this test there really is no application activity. Only the hard irq threads of the Ethernet device, and the soft irq threads from the network scheduler (NAPI). I made the assumption that default priority is set to allow such that hard irq > soft irq.