netdev - Re: [PATCH net-next 0/3] openvswitch: Add STT support.

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Date:	Wed, 21 Jan 2015 12:22:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Pravin Shelar <pshelar@...ira.com>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/3] openvswitch: Add STT support.

On Wed, 2015-01-21 at 11:45 -0800, Tom Herbert wrote:
> > I used bare metal intel servers. All VXLAN tests were done using linux
> > kernel device without any VMs. All STT tests are done using OVS bridge
> > and STT port.
> >
> So right off the bat you're running the baseline differently than the
> target. Anyway, I cannot replicate your numbers for VXLAN, I see much
> better performance and this with pretty old servers and dumb NICs. I
> suspect you might not have GSO/GRO properly enabled, but instead of
> trying to debug your setup, I'd rather restate my request that you
> provide a network interface to STT so we can do our own fair
> comparison.

I have not read specs nor the patch, but I would expect that with a TCP
stream, you simply can coalesce as many inner segments as you want.

So you could build a single TSO packet containing 400 'messages' of 160
bytes or so.

Something that a datagram tunneling cannot really do, assuming you want
full offloading support.




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