Bug #16550
open
Cannot load alternate TCP Congestion Control kernel modules
0%
Description
Since at least the 25.11.b.20251028.1838 beta several TCP CC modules are no longer loading. I have confirmed this is also happening on 25.11.r.20251118.1708. The missing modules are: CDG, Vegas, and CHD. I now only see Cubic, DCTCP, and HTCP available.
Here is the output of my machine running pfSense Plus 25.11.r.20251118.1708:
net.inet.tcp.cc.available:
CCmod D PCB count
cubic 0
dctcp 0
htcp * 25
Here is the output of my machine running pfSense 2.8.1-RELEASE. Prior to pfSense Plus 25.11.b.20251028.1838, the output on my pfSense Plus installation was identical to this:
net.inet.tcp.cc.available:
CCmod D PCB count
cubic 0
cdg 0
vegas 0
hd 0
dctcp 0
htcp * 16
I have the following lines in the loader.conf.local file on both machines:
cc_cdg_load="YES"
cc_htcp_load="YES"
cc_chd_load="YES"
cc_dctcp_load="YES"
cc_hd_load="YES"
cc_vegas_load="YES"
Updated by Marcos M 11 days ago
- Subject changed from Latest Plus 25.11 Beta and RC Do Not Contain Alternative TCP Congestion Control Algorithms to Cannot load alternate TCP Congestion Control kernel modules
$ kldload cc_vegas.ko kldload: an error occurred while loading module cc_vegas.ko. Please check dmesg(8) for more details. # dmesg error: KLD cc_vegas.ko: depends on ertt - not available or version mismatch linker_load_file: /boot/kernel/cc_vegas.ko - unsupported file type
Updated by → luckman212 10 days ago
Where can we read more about these alternate congestion control modules and when they might be useful?