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-rw-r--r--Documentation/networking/igb.txt31
1 files changed, 4 insertions, 27 deletions
diff --git a/Documentation/networking/igb.txt b/Documentation/networking/igb.txt
index ab2d7183189..4a5e29c19bd 100644
--- a/Documentation/networking/igb.txt
+++ b/Documentation/networking/igb.txt
@@ -36,6 +36,7 @@ Default Value: 0
This parameter adds support for SR-IOV. It causes the driver to spawn up to
max_vfs worth of virtual function.
+
Additional Configurations
=========================
@@ -60,9 +61,10 @@ Additional Configurations
Ethtool
-------
The driver utilizes the ethtool interface for driver configuration and
- diagnostics, as well as displaying statistical information.
+ diagnostics, as well as displaying statistical information. The latest
+ version of Ethtool can be found at:
- http://sourceforge.net/projects/gkernel.
+ http://ftp.kernel.org/pub/software/network/ethtool/
Enabling Wake on LAN* (WoL)
---------------------------
@@ -91,31 +93,6 @@ Additional Configurations
REQUIREMENTS: MSI-X support is required for Multiqueue. If MSI-X is not
found, the system will fallback to MSI or to Legacy interrupts.
- LRO
- ---
- Large Receive Offload (LRO) is a technique for increasing inbound throughput
- of high-bandwidth network connections by reducing CPU overhead. It works by
- aggregating multiple incoming packets from a single stream into a larger
- buffer before they are passed higher up the networking stack, thus reducing
- the number of packets that have to be processed. LRO combines multiple
- Ethernet frames into a single receive in the stack, thereby potentially
- decreasing CPU utilization for receives.
-
- NOTE: You need to have inet_lro enabled via either the CONFIG_INET_LRO or
- CONFIG_INET_LRO_MODULE kernel config option. Additionally, if
- CONFIG_INET_LRO_MODULE is used, the inet_lro module needs to be loaded
- before the igb driver.
-
- You can verify that the driver is using LRO by looking at these counters in
- Ethtool:
-
- lro_aggregated - count of total packets that were combined
- lro_flushed - counts the number of packets flushed out of LRO
- lro_no_desc - counts the number of times an LRO descriptor was not available
- for the LRO packet
-
- NOTE: IPv6 and UDP are not supported by LRO.
-
Support
=======