Re: [tcpm] Hystart survey of large server operators

Yuchung,

It was during a Mar 2018 ad hoc workshop Jana had organized at the 
London IETF entitled 'BBR and the intersection with other work". I can't 
remember why I needed to know at the time, but during the break I 
approached the major server operators individually, established whether 
they used Cubic, and if so asked whether they used Hystart or disabled 
it. It's hard to anonymize the results, because IMMSMC all those that 
used Cubic said they disabled Hystart.

If this isn't correct, then maybe people who replied at the time thought 
they were being asked something else. Or maybe it was correct then but 
isn't now.

Bob

On 28/07/2021 00:46, Yuchung Cheng wrote:
> Wait -- how is hystart "invariably disabled" in Linux (cubic)!?
>
> What data indicates that
>
> On Tue, Jul 27, 2021 at 4:37 PM Bob Briscoe <ietf@bobbriscoe.net 
> <mailto:ietf@bobbriscoe.net>> wrote:
>
>     Any large server operator out there who are using Cubic,
>     If you're willing to state whether or not your operations disable
>     Hystart, pls do so in reply.
>     Then Praveen can cite this mailing list thread in the Hystart++
>     draft, as requested below.
>
>     If you are willing to reply privately, I would be willing to keep
>     your confidences, and provide an anonymized result to the list.
>
>     Cheers
>
>
>
>     Bob
>
>     On 27/07/2021 01:50, Praveen Balasubramanian wrote:
>>
>>     Although Hystart is default enabled in Linux, it is invariably
>>     disabled. So, it's misleading to just say Hystart is default
>>     enabled, which implies it's widely used, when people clearly find
>>     it has problems (which motivates Hystart++). I found this out
>>     through an informal survey I did at the Mar'18 IETF in London by
>>     asking round the implementers of the most prevalent stacks (I
>>     would name names if I could find the note I later sent to someone
>>     or to some list, but I can't find it - sry).
>>>>>>
>>>>>>     I'd like some citations on this versus anecdata if possible
>>>>>>     before I add that caveat to the text. Do large deployments
>>>>>>     disable this? I haven't come across this suggestion in any
>>>>>>     Linux tuning guides to date.
>
>     -- 
>     ________________________________________________________________
>     Bob Briscoehttp://bobbriscoe.net/  <http://bobbriscoe.net/>
>
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-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/