At one point there were some requirements on needing fq as the default scheduler algorithm; IIRC when BBR code got merged in mainline in 4.14 that requirement was dropped. I haven't been playing in the network space much in the last 2 years so stopped paying too much attention.
Generally in the past load workflow is to have the scheduler set as a sysctl config file with a high(low) order preference so it gets applied early in boot. I haven't noticed any issues with this and modprobe bringing the module up on the two fc32 nodes I am using. But I did have issues back when I was doing extensive testing in 2017 of the BBR with self compiled kernels to do with ramdisk inclusion/rescue modes etc - which is one of the reasons I started to always compile it in. -Joel On Wed, 18 Mar 2020 at 03:38, Justin Forbes <[email protected]> wrote: > On Tue, Mar 17, 2020 at 6:31 AM Joel Wirāmu Pauling <[email protected]> > wrote: > >> Thanks ; I guess a decision was made to build it as a module vs included >> in >> baseline at some point. I hadn't even thought of checking modules. >> >> This is not something that has changed, git history > on configs/fedora/generic/CONFIG_TCP_CONG_BBR show last change was the > general config reworking in 2017. Even this did not change the way it was > set, only how our config files are generated. Curious if something else > has changed in how userspace tries to load the modules. > > Justin > > On Tue, 17 Mar 2020 at 22:56, Peter Robinson <[email protected]> wrote: >> >> > > I noticed that the kernel builds on the branched fedora32 kernels do >> not >> > > have CONFIG_TCP_CONG_BBR set ; meaning no shiny. >> > >> > The kernel module is built: >> > $ modinfo tcp_bbr >> > filename: >> > >> /lib/modules/5.6.0-0.rc5.git0.2.fc32.x86_64/kernel/net/ipv4/tcp_bbr.ko.xz >> > description: TCP BBR (Bottleneck Bandwidth and RTT) >> > >> > > root@kuriiti network-scripts]# sysctl >> > > net.ipv4.tcp_available_congestion_control >> > > net.ipv4.tcp_available_congestion_control = reno cubic >> > >> > If you manually load the module it's there: >> > >> > # sysctl -a | grep tcp_available_congestion_control >> > net.ipv4.tcp_available_congestion_control = reno cubic >> > # modprobe tcp_bbr >> > # sysctl -a | grep tcp_available_congestion_control >> > net.ipv4.tcp_available_congestion_control = reno cubic bbr >> > >> > I'm not sure the "official" way to use different congestion control >> > algorithms but I'm guessing it's something you can use NetworkManager >> > to specify and autoload them. >> > >> > Peter >> > >> > >> >> -- >> Joel Wirāmu Pauling >> Senior Solutions Architect >> Mobile: (+64) 223608671 >> Email: [email protected] <[email protected]> >> _______________________________________________ >> kernel mailing list -- [email protected] >> To unsubscribe send an email to [email protected] >> Fedora Code of Conduct: >> https://docs.fedoraproject.org/en-US/project/code-of-conduct/ >> List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines >> List Archives: >> https://lists.fedoraproject.org/archives/list/[email protected] >> > -- Joel Wirāmu Pauling Senior Solutions Architect Mobile: (+64) 223608671 Email: [email protected] <[email protected]> _______________________________________________ kernel mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected]
