How to enable tcp bbr in FreeBSD???

[Michael Tuexen]

> On 24. Apr 2020, at 16:23, Mark Johnston <markj at FreeBSD.org> wrote:
> 
> On Fri, Apr 24, 2020 at 03:15:08PM +0100, Tom Jones wrote:
>> rrs at freebsd.org
>> Bcc: 
>> Subject: Re: How to enable tcp bbr in FreeBSD???
>> Reply-To: 
>> In-Reply-To: <6042155a-297b-d85e-1d64-24d93da329a2 at gmail.com>
>> 
>> 
>> ... snip ...
>>> 
>>> Maybe it is not ready for prime time, i do not know why it is not in the
>>> default build.
>>> Maybe ask the committer.
>>> 
>> 
>> I have added rrs@ in cc and the freebsd-transport list. 
>> 
>> Does anyone know if there are plans to enable alternate TCP stacks in
>> generic? 
>> 
>> Is there a stability point we need to hit first?
> 
> There are a couple of open bugs found by syzkaller (complete with
> reproducers) that appeared when I enabled the alternate TCP stacks:
> 
> https://syzkaller.appspot.com/bug?id=986b4cecd84439df9794bda1a45d9cf0f50356fe
> https://syzkaller.appspot.com/bug?id=048f650e99696f881872a285cef0e3b9bd4f4e25
> 
> I'd expect these to be fixed before providing the alternate stacks in
> GENERIC.
We talked about these yesterday in the FreeBSD telco. At least some of them are
related to OOB data. The plan is to disable handling of OOB data in the alternate
stacks. Will bring up a patch and see if that fixes the issues.

Best regards
Michael
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