Re: driver packet coalesce

On 5/30/07, Julian Elischer <julian@xxxxxxxxxxxx> wrote:
Andrew Thompson wrote:
> On Wed, May 30, 2007 at 04:45:05PM -0700, Jack Vogel wrote:
>> Does any driver do this now? And if a driver were to coalesce
>> packets and send something up the stack that violates mss
>> will it barf?
>
> It would barf for things like bridging where the packet gets spit out a
> different interface. The bridge driver already has code to disable
> txcsum so it could be made to handle that too.
>
>
> Andrew
...

This is part od TOE right?

No, its something thats being talked about in our new PCI-E 10G driver.

I presume that it wouldn't coalesce packets that are not destined for the local
machine? would it coalesce in promiscuous mode? I guess it would only be
able to coalesce TCP packets that are adjacent in the same session.
Whether it also can coalesce adjacent packets that are destined for another
machine (for which it is not running the session) is not known... I would guess it
wouldn't do it.

Right, at least that's the lines I was thinking about. At this point this is
brainstorming, and I wanted to know if there were any hard stops that
would keep it from being done.

Jack
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