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

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Date:	Wed, 21 Jan 2015 14:14:05 -0800
From:	Jesse Gross <jesse@...ira.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, Jan 21, 2015 at 1:54 PM, Tom Herbert <therbert@...gle.com> wrote:
> On Wed, Jan 21, 2015 at 12:35 PM, Jesse Gross <jesse@...ira.com> wrote:
>> On Wed, Jan 21, 2015 at 11:45 AM, Tom Herbert <therbert@...gle.com> 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.
>>
>> If I had to guess, I suspect the difference is that UDP RSS wasn't
>> enabled, since it doesn't come that way out of the box. Regardless,
>> you can clearly see a significant difference in single core
>> performance and CPU consumption.
>>
> I'm not going to try to draw conclusions from data which is obviously
> biased and incomplete. If you want to move forward on this, then just
> provide network interface for STT so we can independently run our own
> comparisons against other encapsulations like we've been doing all
> along.

You have the source code, so you are totally free to run whatever
tests you like to draw your own conclusions. Personally, I find a more
than doubling of performance in the environments that I have seen
compelling. Your mileage may vary.
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