Re: network card with LRO (and TSO) in hardware?

[Octavian Purdila <opurdila@ixiacom.com>]

On Thursday 29 May 2008, Rick Jones wrote:
>
> That second bit sounds very much like a "how long is a piece of string"
> question.  What size packets?  What sort of host system(s)?  How many
> concurrent flows/connections etc etc etc...
>

No restrictions... Any packet size (though I presume the lower the better), 
any kind of host systems, any number of concurrent flows (though I presume 
the fewer the better). I am just wondering what is the maximum packet rate 
ever seen by somebody, with hardware LRO.

I am asking this because, theoretically, with hardware LRO we should be able 
to achieve a very high packet rate when using a low MTU (like 64 or 128 
bytes). With software LRO I got a significant PPS increase for TCP traffic - 
from 100K (that with terrible hacks - generating traffic from kernel)  to 
140K (that cleanly, from user-space). So I am wondering what the hardware LRO 
will do.

Thanks,
tavi