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

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Message-Id: <200805292111.01690.opurdila@ixiacom.com>
Date:	Thu, 29 May 2008 21:11:01 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	netdev@...r.kernel.org
Subject: Re: network card with LRO (and TSO) in hardware?

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

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