How to enable TCP BBR support?

[Jones]

Code: [Select]

$ tce-load -w -i net-sched-5.4.3-tinycore.tcz
$ sudo su
# echo 'cake' > /proc/sys/net/core/default_qdisc
# echo 'bbr' > /proc/sys/net/ipv4/tcp_congestion_control
sh: write error: No such file or directory

No TCP BBR support?

[Juanito]

It exists on CorePure64 at least:

Code: [Select]

$ ls /proc/sys/net/ipv4/*congestion*
/proc/sys/net/ipv4/tcp_allowed_congestion_control
/proc/sys/net/ipv4/tcp_available_congestion_control
/proc/sys/net/ipv4/tcp_congestion_control
$ cat /proc/sys/net/ipv4/tcp_available_congestion_control
reno cubic
$ cat /proc/sys/net/ipv4/tcp_allowed_congestion_control
reno cubic
$ cat /proc/sys/net/ipv4/tcp_congestion_control
cubic



[Jones]

It exists on CorePure64 at least:

Code: [Select]

$ ls /proc/sys/net/ipv4/*congestion*
/proc/sys/net/ipv4/tcp_allowed_congestion_control
/proc/sys/net/ipv4/tcp_available_congestion_control
/proc/sys/net/ipv4/tcp_congestion_control
$ cat /proc/sys/net/ipv4/tcp_available_congestion_control
reno cubic
$ cat /proc/sys/net/ipv4/tcp_allowed_congestion_control
reno cubic
$ cat /proc/sys/net/ipv4/tcp_congestion_control
cubic



Only reno and cubic, no bbr algorithm by google, 

[Rich]

Hi Jones
Welcome to the forum.

To enable  BBR  requires  TCP_CONG_ADVANCED  to be set. The kernel config file shows:

Code: [Select]

# CONFIG_TCP_CONG_ADVANCED is not set
You would need to recompile the kernel if you want BBR.

[Rich]

Hi Jones
The help text for configuring  TCP_CONG_BBR  states:

It requires the fq ("Fair Queue") pacing packet scheduler.

I don't see anything in the Kconfig file that enables that when  TCP_CONG_BBR  is selected. You should check that:

Code: [Select]

NET_SCH_FQis enabled prior to compiling.

[Jones]

Hi Jones
The help text for configuring  TCP_CONG_BBR  states:

It requires the fq ("Fair Queue") pacing packet scheduler.

I don't see anything in the Kconfig file that enables that when  TCP_CONG_BBR  is selected. You should check that:

Code: [Select]

NET_SCH_FQis enabled prior to compiling.

Thanks, I will try it later.

[ovacikar]

Tiny core 15 x86 still does not have BBR, but picore 15 does . Is there a wishlist thread for tiny core 16? I would like to have both Pi and x86 kernels bullt with same features.

Code: [Select]

tc@xxxx:~$ uname -a
Linux xxxx 6.6.8-tinycore #666 SMP Sat Dec 23 15:26:47 UTC 2023 i686 GNU/Linux
tc@xxxx:~$ cat /proc/sys/net/ipv4/tcp_available_congestion_control
reno cubic


tc@yyyy:~$ uname -a
Linux yyyy 6.6.47-piCore #9 Sat Aug 31 14:48:51 EDT 2024 armv6l GNU/Linux
tc@yyyy:~$ cat /proc/sys/net/ipv4/tcp_available_congestion_control
reno cubic bbr

[curaga]

Ok, will enable it.

[ovacikar]

thanks, here is a diff :

Code: [Select]

diff config-6.6.8-tinycore 6.6.47-piCore_.config | grep -i tcp
< CONFIG_INET_TCP_DIAG=y
< # CONFIG_TCP_CONG_ADVANCED is not set
> CONFIG_INET_TCP_DIAG=m
> CONFIG_TCP_CONG_ADVANCED=y
> CONFIG_TCP_CONG_BIC=m
> CONFIG_TCP_CONG_WESTWOOD=m
> CONFIG_TCP_CONG_HTCP=m
> # CONFIG_TCP_CONG_HSTCP is not set
> # CONFIG_TCP_CONG_HYBLA is not set
> # CONFIG_TCP_CONG_VEGAS is not set
> # CONFIG_TCP_CONG_NV is not set
> # CONFIG_TCP_CONG_SCALABLE is not set
> # CONFIG_TCP_CONG_LP is not set
> # CONFIG_TCP_CONG_VENO is not set
> # CONFIG_TCP_CONG_YEAH is not set
> # CONFIG_TCP_CONG_ILLINOIS is not set
> # CONFIG_TCP_CONG_DCTCP is not set
> # CONFIG_TCP_CONG_CDG is not set
> CONFIG_TCP_CONG_BBR=m