Error loading tcp_bbr kernel module
Gordon Bergling
gbergling at googlemail.com
Sat May 9 16:07:19 UTC 2020
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.
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
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