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Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft

"Scaglione, Giuseppe" <giuseppe.scaglione@hpe.com> Fri, 09 August 2019 21:43 UTC

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From: "Scaglione, Giuseppe" <giuseppe.scaglione@hpe.com>
To: Greg White <g.white@CableLabs.com>, Jonathan Morton <chromatix99@gmail.com>
CC: "rgrimes@freebsd.org" <rgrimes@freebsd.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
Thread-Topic: [tsvwg] Switch testing at 25G with ECN --SCE Draft
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Date: Fri, 09 Aug 2019 21:42:58 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/LEAFBSh6KH2d_AzaA0o7gk57qW8>
Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft
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Greg,

We are working -- and in beta -- with having the switch natively set SCE bits instead of CE and removing the iptable configuration on the target server.  Yet, I do not expect any different result since the TCP-SCE stack would react the same.

Regards,
Giuseppe Scaglione


-----Original Message-----
From: Greg White [mailto:g.white@CableLabs.com] 
Sent: Friday, August 9, 2019 2:36 PM
To: Jonathan Morton <chromatix99@gmail.com>; Scaglione, Giuseppe <giuseppe.scaglione@hpe.com>
Cc: rgrimes@freebsd.org; tsvwg@ietf.org
Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft

Right.  Per the SCE method, the switch would mark ECT(1) using a ramp, and then when the ramp would exceed 100% marking, it would change to using CE.  

The implementation discussed here marks CE using a ramp, and when the ramp would exceed 100% marking, it changes to packet drop.  This, as you said, is simply RFC3168 ECN marking, not SCE ECN marking.

I was just trying to set the record straight.  There was a claim made that a switch vendor had implemented SCE-style packet marking in hardware at 25Gbps, which wasn't accurate.

-Greg



On 8/9/19, 2:58 PM, "Jonathan Morton" <chromatix99@gmail.com> wrote:

    > On 9 Aug, 2019, at 11:44 pm, Scaglione, Giuseppe <giuseppe.scaglione@hpe.com> wrote:
    > 
    >>> Just to be super clear, this isn't a hardware implementation of SCE running at 25Gbps.
    > 
    > I am not sure I follow. The Test setup section of the paper clearly describes the hardware used -- severs, switch, cables. 
    > What I cannot disclose at this point is the exact model and characteristics of the HPE Aruba Switch used. Yet, it is a "real" Ethernet Switch, providing 25Gbps connectivity, configured to do bridging across the four ports and implementing RFC3168 with the ECN remarking configuration described in my previous email and on the paper.
    
    I think the issue is with the way the switch itself marks with CE, not ECT(1).  It's a limitation I think is worth acknowledging and, hopefully, finding a way to remove.
    
     - Jonathan Morton

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