From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Graf Subject: [PATCH 0/2 net-next v2] Bring sizeof(net_device) down to < 2K bytes Date: Fri, 10 Apr 2015 15:52:36 +0200 Message-ID: Cc: jeffrey.t.kirsher@intel.com, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, eric.dumazet@gmail.com, daniel@iogearbox.net To: davem@davemloft.net Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:33621 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933781AbbDJNws (ORCPT ); Fri, 10 Apr 2015 09:52:48 -0400 Sender: netdev-owner@vger.kernel.org List-ID: The size of struct net_device crossed the 2K boundary a while ago which is a waste in combination with many net namespaces. This series brings the size of struct net_device down to well below 2K in total size with a typical configuration. Some reserves a several holes leave room for further expansion. Before: /* size: 2176, cachelines: 34, members: 121 */ After: /* size: 1984, cachelines: 31, members: 120 */ Thomas Graf (2): e1000e: Move pm_qos_req to e1000e adapter net_device: Reorder members to fill holes drivers/net/ethernet/intel/e1000e/e1000.h | 1 + drivers/net/ethernet/intel/e1000e/netdev.c | 8 +++--- include/linux/netdevice.h | 46 ++++++++++++++---------------- 3 files changed, 26 insertions(+), 29 deletions(-) --- v2: - Moved pm_qos_req to e1000e adapter entirely as suggested by Daniel - Dropped patch 2 based on comment from Eric. __alignof__ is not reliable to derive alignment of kmalloc returned pointer.