From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: [RFC PATCH net-next-2.6 0/2] Automatic XPS mapping Date: Fri, 18 Feb 2011 16:13:27 +0000 Message-ID: <1298045607.2570.17.camel@bwh-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev , sf-linux-drivers To: Tom Herbert Return-path: Received: from mail.solarflare.com ([216.237.3.220]:39892 "EHLO exchange.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751758Ab1BRQNa (ORCPT ); Fri, 18 Feb 2011 11:13:30 -0500 Sender: netdev-owner@vger.kernel.org List-ID: In the same way that we maintain a mapping CPUs to RX queues for RFS acceleration based on current IRQ affinity and the CPU topology, we can maintain a mapping of CPUs to TX queues for queue selection in XPS. (In fact this may be the same mapping.) Questions: - Does this make a real difference to performance? (I've only barely tested this.) - Should there be a way to disable it? - Should the automatic mapping be made visible? (This applies RFS acceleration too.) - Should different mappings be allowed for different traffic classes, in case they have separate sets of TX interrupts with different affinity? (This applies to manual XPS configuration too.) Ben Hutchings (2): net: XPS: Allow driver to provide a default mapping of CPUs to TX queues sfc: Add CPU queue mapping for XPS drivers/net/sfc/efx.c | 59 +++++++++++++++++++++++++++++++------------- include/linux/netdevice.h | 10 +++++-- net/Kconfig | 17 +++++++++---- net/core/dev.c | 41 +++++++++++++++++------------- 4 files changed, 83 insertions(+), 44 deletions(-) -- 1.7.3.4 -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.