Re: [E1000-devel] help with igb driver

[Wyborny, C. <car...@in...>]

>-----Original Message-----
>From: Alexander Stavitsky [mailto:ad...@ta...]
>Sent: Thursday, March 31, 2011 7:52 AM
>To: e10...@li...
>Cc: Ronciak, John
>Subject: [E1000-devel] help with igb driver
>
>Hello.
>
>I've been talking with John Ronciak about igb driver problems on Linux
>(RHEL 6 Linux bgp 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT
>2010 x86_64 x86_64 x86_64 GNU/Linux box) in shaper role, it seems
>problem is solved by disabling irqbalance daemon. For now we have
>builded new server with equal hardware:
>S5000PAL platform and E1G44ET (igb) network adapter.
>Basic role for this server is BGP router. But after testing we have got
>some strange behavior. It seems, that all working fine, iptables
>completely disabled, nf_conntrack modules not loaded, http pages are
>working fine, but when we try to load some other http pages, they are
>not working (could not load completely, but it's randomly - one time it
>loads and one time - no). We have read somewhere in Internet, that it's
>required to disable LRO, while routing, but it seems, that it's disabled
>by driver (ethtool -k), for example:
>Offload parameters for eth0:
>rx-checksumming: on
>tx-checksumming: on
>scatter-gather: on
>tcp-segmentation-offload: on
>udp-fragmentation-offload: off
>generic-segmentation-offload: on
>generic-receive-offload: on
>large-receive-offload: off
>So, is it truly disabled, or it should be done via insmod/modprobe
>arguments? And if it's disabled - what's wrong with our configuration?
>And maybe you can give us some assumption. (for example - some tcp
>tuning for igb driver)
>I should say, that this hardware is working fine for shaping, but for
>routing - no in our case.
>
>--
>With best regards, Alexander A. Stavitsky
>U-LAN Telecommunication company
>2 Volskaya str., bld. 22-1
>Cell phone: +7 (925) 071-46-94
>Landline phone: +7 (495) 660-02-08 ext. 777
>
>
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Hello,

Try using ethtool to turn off generic-receive-offload.  It should be disabled in routing configurations as well.

Let me know if it makes a difference,

Thanks,

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation