Question about ixgbe-module

[udo]

Hi,
I had an issue on a debian-7 box with the 10GBE-Nic (not PVE related). Due this issue I compile the actual intel-driver (ixgbe-3.15.1) and see this the readme:

WARNING:  The ixgbe driver compiles by default with the LRO (Large Receive
Offload) feature enabled.  This option offers the lowest CPU utilization for
receives, but is completely incompatible with *routing/ip forwarding* and
*bridging*.  If enabling ip forwarding or bridging is a requirement, it is
necessary to disable LRO using compile time options as noted in the LRO
section later in this document.  The result of not disabling LRO when combined
with ip forwarding or bridging can be low throughput or even a kernel panic.

For the debian-7 box I don't need bridging/forwarding (ceph host) but I look on the pve-host and see this:

modinfo ixgbe
filename:       /lib/modules/2.6.32-20-pve/kernel/drivers/net/ixgbe/ixgbe.ko
version:        3.14.5
license:        GPL
description:    Intel(R) 10 Gigabit PCI Express Network Driver
author:         Intel Corporation, <linux.nics@intel.com>
srcversion:     EC8AD2A0C3B9A7ED6B35920
...
parm:           LRO:Large Receive Offload (0,1), default 1 = on (array of int)

Is this right??

Udo

 

[dietmar]

I build that module with:

make CFLAGS_EXTRA="-DIXGBE_NO_LRO"

So that should be disabled.

 

[udo]

I build that module with:

make CFLAGS_EXTRA="-DIXGBE_NO_LRO"

So that should be disabled.

Hi Dietmar,
thanx for the info - and yes it's disabled. ethtool -k show the right settings.

Strange, that modinfo show the default, even it's compiled with CFLAGS_EXTRA="-DIXGBE_NO_LRO"...


Udo