SCTP performance?

I just added some support for SCTP to my traffic-generator tool.

I tried to send 1Gbps of traffic, bi-directional, across two
10G interfaces.  TCP does this without any trouble at all,
but SCTP was asymetric and never got above around 700Mbps,
and was usually stuck at < 500Mbps.

perf top didn't show any obvious CPU bottlenecks.

Has anyone done any recent performance testing with SCTP?

I'd be interested to know the results if so...

Thanks,
Ben

-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com

On Fri, 2013-08-09 at 16:11 -0700, Ben Greear wrote:

I just added some support for SCTP to my traffic-generator tool.

I tried to send 1Gbps of traffic, bi-directional, across two
10G interfaces.  TCP does this without any trouble at all,
but SCTP was asymetric and never got above around 700Mbps,
and was usually stuck at < 500Mbps.

perf top didn't show any obvious CPU bottlenecks.

Has anyone done any recent performance testing with SCTP?

I'd be interested to know the results if so...

You mean there is no SCTP offload on the NIC and/or GRO, yes that's too
bad.

On 08/09/2013 04:21 PM, Eric Dumazet wrote:

On Fri, 2013-08-09 at 16:11 -0700, Ben Greear wrote:

quoted

I just added some support for SCTP to my traffic-generator tool.

I tried to send 1Gbps of traffic, bi-directional, across two
10G interfaces.  TCP does this without any trouble at all,
but SCTP was asymetric and never got above around 700Mbps,
and was usually stuck at < 500Mbps.

perf top didn't show any obvious CPU bottlenecks.

Has anyone done any recent performance testing with SCTP?

I'd be interested to know the results if so...

You mean there is no SCTP offload on the NIC and/or GRO, yes that's too
bad.

I'm sure that is part of the problem.

I got much better results when I explicitly set the
tx/rx socket buffer sizes to 2MB, so maybe it just sucks
at auto-tuning it's socket buffer sizes.

Thanks,
Ben

-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com

From: Ben Greear <redacted>
Date: Fri, 09 Aug 2013 17:04:59 -0700

I got much better results when I explicitly set the
tx/rx socket buffer sizes to 2MB, so maybe it just sucks
at auto-tuning it's socket buffer sizes.

TCP is the only protocol in our stack which does socket buffer
size autotuning.

On 08/09/2013 08:04 PM, Ben Greear wrote:

On 08/09/2013 04:21 PM, Eric Dumazet wrote:

quoted

On Fri, 2013-08-09 at 16:11 -0700, Ben Greear wrote:

quoted

I just added some support for SCTP to my traffic-generator tool.

I tried to send 1Gbps of traffic, bi-directional, across two
10G interfaces.  TCP does this without any trouble at all,
but SCTP was asymetric and never got above around 700Mbps,
and was usually stuck at < 500Mbps.

perf top didn't show any obvious CPU bottlenecks.

Has anyone done any recent performance testing with SCTP?

I'd be interested to know the results if so...

You mean there is no SCTP offload on the NIC and/or GRO, yes that's too
bad.

I'm sure that is part of the problem.

I got much better results when I explicitly set the
tx/rx socket buffer sizes to 2MB, so maybe it just sucks
at auto-tuning it's socket buffer sizes.

Thanks,
Ben

There is no buffer autotunning.  There is also no GRO since SCTP doesn't
lend itself easily to GRO. :(

There has been some research efforts at autotunning, but nothing 
proposed.  I'll see if I can find the code and make it work better.

-vlad