From: Neil Turton <nturton@solarflare.com>
Date: Sat, 13 Dec 2008 05:41:06 +0000 (-0800)
Subject: sfc: Add option to use a separate channel for TX completions
X-Git-Tag: v2.6.29-rc1~581^2~225
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28b581ab0a0aa7bc8b22935779ca3e8d6f651ac7;p=pandora-kernel.git

sfc: Add option to use a separate channel for TX completions

In a bidirectional forwarding test, we find that the best performance
is achieved by sending the TX completion interrupts from one NIC to a
CPU which shares an L2 cache with RX completion interrupts from the
other NIC.  To facilitate this, add an option (through a module
parameter) to create separate channels for RX and TX completion with
separate IRQs when MSI-X is available.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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