Re: [Xen-users] slow network with gplpv drivers in vlan setup

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

James,
> > Any chance for an explanation ? what scatter/gather is supposed to
> >      
> bring ?
>
> Large Send is probably what is causing you problems. Some network cards
> support large send offload only for untagged packets.
Well that's a bit strange because on 2 identical dom0 servers configured 
the same way I had this behavior only on one dom0 (the really loaded 
server).
>   Linux doesn't seem
> to know this though so the result is just that it doesn't work. Try
> turning off large send and see what happens.
>
>    
Ok so you suggest to change the value of 61440 to something smaller (ie. 
8192)
> Turning off scatter gather will (almost completely) disable large send
> also, because windows is then limited to a total packet length of 4096
> bytes which can't be broken up unless the MSS is really small.
>    
The question that stay is what is drawback of not having  large send ?

Matthieu.

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