Re: Error loading tcp_bbr kernel module

> On 9. May 2020, at 18:07, Gordon Bergling <gbergling_at_googlemail.com> wrote:
> 
> Hi Michael,
> 
> On Sat, May 09, 2020 at 05:42:55PM +0200, Michael Tuexen wrote:
>>> On 9. May 2020, at 16:25, Gordon Bergling <gbergling_at_googlemail.com> wrote:
>>> 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...
> 
> My first thoughts on this topic were about to extent tcp(4) and create links to
> tcp_rack(4) and tcp_bbr(4), but separate manpages maybe the way to go. I just
> have to investigate the respective details. I was once very deep into TCP/IP, 
> while building perimeter firewalls with FreeBSD, but this was 20 years ago.
> 
> I add you as a reviever for the differential once I have a rough cut 
> for the manpages ready.
Hi Gordon,

please do so. Don't forget to add rrs_at_, since he wrote both stacks.

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
>>>> 
>>>>> 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