Error loading tcp_bbr kernel module

[Gordon Bergling]

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.

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.

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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