Re: Tigon3 5701 PCI-X recv performance problem

[John Partridge <johnip@sgi.com>]

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