Re: How to enable tcp bbr in FreeBSD???

From: Michael Tuexen <tuexen_at_freebsd.org>
Date: Fri, 24 Apr 2020 23:44:30 +0200
> On 24. Apr 2020, at 23:41, Neel Chauhan <neel_at_neelc.org> wrote:
> 
> Not OP, but would BBR work with VNET, or is that a WIP?
I would say it should work. At least, if not I would consider it a bug.
I think most testing was not done with multiple VNETs.

Best regards
Michael
> 
> I'm sorry if none of you are familiar with VNET.
> 
> -Neel
> 
> ===
> 
> https://www.neelc.org/
> BTW: Not neel_at_ the committer
> 
> On 2020-04-24 12:25, Michael Tuexen wrote:
>>> On 24. Apr 2020, at 21:06, Rodney W. Grimes <freebsd-rwg_at_gndrsh.dnsmgr.net> wrote:
>>>> On Fri, Apr 24, 2020 at 01:31:35PM +0200, Kurt Jaeger wrote:
>>>>> Thanks. Is BBR active automatically or is there a sysctl or
>>>>> socket option to activate it ?
>>>> net.inet.tcp.cc.available: List available congestion control algorithms
>>>> net.inet.tcp.cc.algorithm: Default congestion control algorithm
>>> Start at:
>>> man mod_cc
>> BBR is conceptually a CC, but in FreeBSD it is NOT implemented as a CC module.
>> It is a TCP stack. You need to load it using
>> kldload tcp_bbr
>> and then either make it the default by
>> sudo sysctl net.inet.tcp.functions_default=bbr
>> or use the IPPROTO_TCP level socket option TCP_FUNCTION_BLK to set the stack
>> to BBR. The uperf test tool allows to set the TCP stack for measurements.
>> Please note that you need to compile the kernel with
>> makeoptions	WITH_EXTRA_TCP_STACKS=1
>> options		TCPHPTS
>> Best regards
>> Michael
>>> --
>>> Rod Grimes                                                 rgrimes_at_freebsd.org
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Received on Fri Apr 24 2020 - 19:44:33 UTC

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