strange igb interface performance problems

[Arnaud Lacombe]

Hi,

On Thu, Jun 9, 2011 at 11:53 AM, Mario Spinthiras
<spinthiras.mario at gmail.com> wrote:
> Hello All,
>
>  The subject topic might catch a few by surprise because for the most part
> it smells a lot like a problem that came to light in 2009 regarding bad
> performance on Intel NICs using the igb driver.
>
>  I currently have a point to point link between 2 pfsense 2.0RC1 running
> FreeBSD 8.1 that connect via a 1Gbps link. The link itself has been tested
> and the provider reckons that the link is fine. (I also believe this too).
>
What kind of link  What RTT ?

> We then started high and went low to search for the problem. We ditched out
> the media converters, went on a mad mission to tune every single last detail
> on the stack to give us the full performance, however on the 1Gbps line we
> see a rough 20Mbps.
>
What kind of traffic ? from your later comment, I'd assume TCP. What about UDP ?

> We then turned towards the igb driver which smells a little funny
> considering that the issues I mentioned that have emerged back in 2009
> regarding similar issues are alive and well today.
>
Could you details those trouble ? 2 years is certainly a very long
time, especially for people who were not on the list then.

> Does anyone out there have any experience or knowledge of such problems
> caused by the igb driver? I'm going to plan a maintenance window on this
> link within the next day or so hoping that I'll be able to live boot a 2.0
> RC1 nightly and try it again. The current RC1 is one of the earlier ones.
>
> Any info you can send my way on this baffling mystery that has taken me on a
> goose chase. Disabling TSO/LRO does not solve the problem for me. Can anyone
> shed some light on this?
>
Can you at least post some information on the system, relevant part of
'dmesg', 'ifconfig -a' and 'pciconf -l', 'netstat -m', 'sysctl
dev.igb' after the test,

Thanks,
 - Arnaud

>
> Thanking you all in advance,
>
> Mario
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