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Re: Tigon3 5701 PCI-X recv performance problem

To: "David S. Miller" <davem@xxxxxxxxxx>
Subject: Re: Tigon3 5701 PCI-X recv performance problem
From: John Partridge <johnip@xxxxxxx>
Date: Mon, 10 Nov 2003 19:24:38 -0600
Cc: ak@xxxxxxx, netdev@xxxxxxxxxxx, jgarzik@xxxxxxxxx, jes@xxxxxxx
In-reply-to: <20031014095323.71c8b9fe.davem@redhat.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>
Reply-to: johnip@xxxxxxx
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031022 Thunderbird/0.3
I'm working on a patch for the tg3 driver for 2.6

Please can you look at this. I'm not too sure about the Kconfig entry as I have 
not done one before :-

--- 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/drivers/net/Kconfig   2003-10-25 13:44:36.000000000 -0500
+++ patch/drivers/net/Kconfig   2003-11-10 19:21:15.000000000 -0600
@@ -2017,6 +2017,9 @@
          To compile this driver as a module, choose M here: the module
          will be called tg3.  This is recommended.

+config CONFIG_UNALIGNED_EXPENSIVE
+       bool "Use Aligned SKB's for 5701 cards (for Itanium2 based systems)"
+       depends on TIGON3 && IA64
 endmenu

 #


Thks John

--
John Partridge

Silicon Graphics Inc
Tel:  651-683-3428
Vnet: 233-3428
E-Mail: johnip@xxxxxxx


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