Re: Odd behaviour under Linux 2.6.21

[James Healy <jhealy () swin edu au>]

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Gianluca Varenni wrote:
> I guess it's some sort of TCP offloading done at the board level. The
> driver sends big frames (>1500bytes) to the NIC card, and the NIC card
> is responsible from creating smaller segments that are sent over the
> wire. I've seen a similar behavior on Windows with some gigabit network
> cards (if i remember well at least with some broadcom chipsets).

Spot on. I just had my first encounter with TSO. 2.6.17 was the first
kernel where TSO was enabled by default for my nic (tg3 driver).

Thanks for the pointer.

James
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