From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Partridge Subject: Re: Tigon3 5701 PCI-X recv performance problem Date: Tue, 11 Nov 2003 15:39:49 -0600 Sender: netdev-bounce@oss.sgi.com Message-ID: <3FB15725.4050705@sgi.com> References: <3F844578.40306@sgi.com> <20031008101046.376abc3b.davem@redhat.com> <3F8455BE.8080300@sgi.com> <20031008183742.GA24822@wotan.suse.de> <20031008122223.1ba5ac79.davem@redhat.com> <20031008202248.GA15611@oldwotan.suse.de> <3F8702FF.70500@sgi.com> <20031010192036.GA31727@wotan.suse.de> <3F8802E6.5030601@sgi.com> <20031011131921.GC21763@wotan.suse.de> <20031011105054.0e16a607.davem@redhat.com> <3F8C290A.3010508@sgi.com> <20031014095323.71c8b9fe.davem@redhat.com> <3FB03A56.7000709@sgi.com> <20031110182911.2c5a121b.davem@redhat.com> <3FB140E2.1070007@sgi.com> <20031111122403.2d7bcf28.davem@redhat.com> Reply-To: johnip@sgi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: ak@suse.de, netdev@oss.sgi.com, jgarzik@pobox.com, jes@sgi.com, David Mosberger Return-path: To: "David S. Miller" In-Reply-To: <20031111122403.2d7bcf28.davem@redhat.com> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org David S. Miller wrote: > Why are you depending upon MCKINLEY? Don't all ia64 cpus > give traps for unaligned memory accesses? > > That is what this CONFIG option tells the whole kernel. OK, I made it ALL IA64, but I only know for sure about Itanium2's --- linux/drivers/net/tg3.c 2003-11-10 18:28:10.000000000 -0600 +++ patch/drivers/net/tg3.c 2003-11-10 18:58:35.000000000 -0600 @@ -2257,7 +2257,11 @@ len = ((desc->idx_len & RXD_LEN_MASK) >> RXD_LEN_SHIFT) - 4; /* omit crc */ - if (len > RX_COPY_THRESHOLD) { + if (len > RX_COPY_THRESHOLD +#if defined(CONFIG_UNALIGNED_EXPENSIVE) + && tp->rx_offset == 2 +#endif + ) { int skb_size; skb_size = tg3_alloc_rx_skb(tp, opaque_key, --- linux/arch/ia64/Kconfig 2003-10-25 13:44:46.000000000 -0500 +++ patch/arch/ia64/Kconfig 2003-11-11 15:37:58.000000000 -0600 @@ -468,6 +468,11 @@ agent" (/sbin/hotplug) to load modules and set up software needed to use devices as you hotplug them. +config CONFIG_UNALIGNED_EXPENSIVE + bool "Use kernel aligned buffers" + depends on IA64 + default y + source "drivers/pci/hotplug/Kconfig" source "drivers/pcmcia/Kconfig" -- John Partridge Silicon Graphics Inc Tel: 651-683-3428 Vnet: 233-3428 E-Mail: johnip@sgi.com