netdev - Re: Linux stack performance drop (TCP and UDP) in 3.10 kernel in routed scenario

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Message-ID: <1401949947.3645.267.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 04 Jun 2014 23:32:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Suprasad Mutalik Desai <suprasad.desai@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Linux stack performance drop (TCP and UDP) in 3.10 kernel in
 routed scenario

On Thu, 2014-06-05 at 07:47 +0530, Suprasad Mutalik Desai wrote:

> So, I request you to please suggest on how to address this topic w.r.t
> embedded devices ( routers) which has limited memory resources ?

Hmm... How do you catch a cloud and pin it down ?

More seriously...

What about removing this tcp checksum ?

This is the main cost according to your performance data.

Then, you are free to implement a cache of your own where it might help.

Tom Herbert added partial cache on tunnels for example in linux-3.15 or
something like that.

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