Re: [lwip-users] TCP - problems with large data

[Norberto R. de Goes Jr.]

Hi Simon!

I think a note about "gro" is appropriate,  for instance, in http://lwip.wikia.com/wiki/Tuning_TCP site.

Thank you very much!

Regards,

Norberto

Em ter, 8 de jan de 2019 às 09:23, goldsimon <address@hidden> escreveu:

Am 8. Januar 2019 11:50:48 MEZ schrieb "Norberto R. de Goes Jr." <address@hidden>:
>How are you?
>
>After a long time spent in this issue with debugging in my network
>drive
>(socket raw), lwip configuration tuning (lwipopts.h), my client code,
>etc,
>etc; I noted (using simhost -d) that large packets  caused check-sum
>error
>in the lwip received side. So by searching in the internet, I found
>links
>relating to "offload segmentation".
>Resuming,  when I disable the "gro" (generic-receive-offload) of the
>NIC
>that treats the lwip packets the problem disappears.
>Command (for eth0):   > sudo ethtool -K eth0 gro off
>Verification:                > ethtool -k eth0 | grep
>generic-receive-offload
>
>Please, does this make sense?

Yes, it does. Sorry for not having found the time to dig into this. It has been on my list...

But it seems you found the reason. We should add this to our documentation somewhere. Where would you have looks for this?

Regards,
Simon

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Norberto R. de Goes Jr.
CPqD - DRC
Tel.: +55 19 3705-4241 / Fax: +55 19 3705-6125
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