Error loading tcp_bbr kernel module
Michael Tuexen
tuexen at freebsd.org
Sat May 9 15:43:23 UTC 2020
> On 9. May 2020, at 16:25, Gordon Bergling <gbergling at googlemail.com> wrote:
>
> Hi Michael,
>
> thanks for your reply.
>
> I tried tcp_rack and tcp_bbr, since both are separate TCP stacks. I just posted the wrong error message. Both TCP stacks weren’t loadable as a kernel module with just the former mentioned build option.
>
> I currently have build running with both kernel options you mentioned.
>
> If the build is successful and I can change the default TCP stack to RACK and BBR I let you know.
That would be great. I have them running on my machines, but I might have missed something.
>
> Further I didn’t find any documentation within tcp(4) regarding RACK and BBR. Since I am about to enhance the manpages, I’ll extent tcp(4) about information about RACK and BBR, but this is a different topic.
>
Yes it is. And I would suggest to use separate man pages, a single one for each stack.
The the generic man page might refer to them...
Best regards
Michael
> Best regards,
>
> Gordon
>
>> Am 09.05.2020 um 14:37 schrieb Michael Tuexen <tuexen at freebsd.org>:
>>
>>> On 9. May 2020, at 14:18, Gordon Bergling <gbergling at googlemail.com> wrote:
>>>
>>> Greetings,
>>>
>>> I build -CURRENT with WITH_EXTRA_TCP_STACKS=1, but I got the following error
>>> when I try to load for example tcp_bbr.ko.
>>> z
>>> kldload: an error occurred while loading module tcp_rack.ko. Please check dmesg(8) for more details.
>> This indicates that you want to load the RACK stack.
>>
>> Please note that you need for BBR and RACK:
>> options TCPHPTS
>> in the kernel config and in addition to that for RACK
>> options RATELIMIT
>>
>> Best regards
>> Michael
>>>
>>> dmesg shows:
>>>
>>> KLD tcp_bbr.ko: depends on tcphpts - not available or version mismatch
>>> linker_load_file: /boot/kernel/tcp_bbr.ko - unsupported file type
>>>
>>> Any hints on solving the problem?
>>>
>>> The kernel config is GENERIC.
>>>
>>> Best regards,
>>>
>>> Gordon
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