Date: Sat, 9 May 2020 21:03:02 +0200 From: Michael Tuexen <tuexen@freebsd.org> To: Gordon Bergling <gbergling@googlemail.com> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org>, david@catwhisker.org Subject: Re: Error loading tcp_bbr kernel module Message-ID: <3B396584-1018-46ED-B7F9-35215B4AF17C@freebsd.org> In-Reply-To: <20200509160714.GA38490@lion.0xfce3.net> References: <20200509121851.GA59530@lion.0xfce3.net> <24D28CC3-AA45-412F-AF3D-9697A36FCB8D@freebsd.org> <F9EDABC9-504C-4A27-AFD0-F0A1BAB656A2@googlemail.com> <EE9FDF78-3E8A-4655-AFF3-91605FC1FEF2@freebsd.org> <20200509160714.GA38490@lion.0xfce3.net>
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> On 9. May 2020, at 18:07, Gordon Bergling <gbergling@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@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@, since he wrote both stacks. Best regards Michael > > Best regards, > > Gordon > >>>> Am 09.05.2020 um 14:37 schrieb Michael Tuexen <tuexen@freebsd.org>: >>>>> On 9. May 2020, at 14:18, Gordon Bergling <gbergling@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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