netdev - Re: GSO/GRO and UDP performance

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Message-ID: <1378472829.31445.21.camel@edumazet-glaptop>
Date:	Fri, 06 Sep 2013 06:07:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	James Yonan <james@...nvpn.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: GSO/GRO and UDP performance

On Fri, 2013-09-06 at 03:22 -0600, James Yonan wrote:

> So I think that playing well with GSO/GRO is essential to get speedup in 
> UDP apps because of this 43x multiplier.
> 

Thats not true. GRO cannot aggregate more than 16+1 packets.

I think we cannot aggregate UDP packets, because UDP lacks sequence
numbers, so reorders would be a problem.

You really need something that is not UDP generic.



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