[suse-sles-e] Does tg3 support NAPI? (tuning for packet capture)

From: Steven L. Kohrs (skohrs_at_opensourceexperts.com)
Date: Wed Jul 19 2006 - 19:16:54 CEST 

Message-ID: <44BE6906.60702@opensourceexperts.com>
Date: Wed, 19 Jul 2006 12:16:54 -0500
From: "Steven L. Kohrs" <skohrs@opensourceexperts.com>
Subject: [suse-sles-e] Does tg3 support NAPI? (tuning for packet capture)

I am trying to tune a SLES 9 server for use as a snort-inline intrusion
prevention system (IPS). I've read that NAPI support greatly increases
packet throughput. Currently, the server has Broadcom NICs that are
using the tg3 driver. The following shows NAPI support has been
compiled into the kernel, but I don't see anything that mentions tg3 (or
bcm5700):

zcat /proc/config.gz | grep -i napi

CONFIG_TULIP_NAPI=y
CONFIG_TULIP_NAPI_HW_MITIGATION=y
CONFIG_ADAPTEC_STARFIRE_NAPI=y
CONFIG_E100_NAPI=y
CONFIG_E1000_NAPI=y
CONFIG_IXGB_NAPI=y
CONFIG_S2IO_NAPI=y

Google is starting to suck with all the irrelevant information it
returns, even with narrowing the search down to specific sites and
languages.

Has anyone tried to tune SLES 9 for maximum packet throughput/capture
performance? Am I one the right track or way off?

The good news is, we've ordered an Adlink PCI-8246 NIC (for its bypass
capability) which is based on an Intel chipset. This should use the
e1000 driver and give us better tuning parameters.

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