OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity Medium
  • Priority Very Low
  • Reported Version openwrt-19.07
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Siwind - 01.04.2020

FS#2956 - tcp_bbr: suffering poor performance with samba4-server

Environment: Newifi-D2(arch mipsel_24kc), OpenWrt 19.07.1/19.07.2/master branch with kernel 1.14.170+, samba-4.11, a usb-disk with ext4 file system.
(samba4 uses default settings)

I run samba-4.11 server in my router with usb-harddisk of 3T volumes. If the router enables tcp_bbr kernel module with default config file, then lan PCs copying files from the router is very slowly with speed of 4-10MB. The speed of writing files to router’s share is also a little slower.
Without tcp_bbr the speed is up to 40-60MB when copying files from the router.

I found the problem is caused by lack value of “net.core.default_qdisc=fq” in default bbr config file (/etc/sysctl.d/12-tcp-bbr.conf)
The default bbr config file is :
```
# Do not edit, changes to this file will be lost on upgrades
# /etc/sysctl.conf can be used to customize sysctl settings

net.ipv4.tcp_congestion_control=bbr
net.core.default_qdisc=fq #add this line then problem disappear.
```


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