[Bloat] "BBR" TCP patches submitted to linux kernel

[Eric Dumazet]

On Fri, 2016-10-21 at 12:42 +0200, Steinar H. Gunderson wrote:
> On Fri, Oct 21, 2016 at 03:28:01AM -0700, Eric Dumazet wrote:
> > Could you provide /proc/sys/net/ipv4/tcp_rmem
> > and /proc/sys/net/ipv4/tcp_wmem values on your server ?
> 
> I see I have old sysctl.conf settings here, from tuning way back in the 2.6
> era:
> 
>   net/core/rmem_max = 8738140
>   net/core/wmem_max = 8738140
>   
>   net/ipv4/tcp_rmem = 4096 873814 8738140
>   net/ipv4/tcp_wmem = 4096 873814 8738140
> 
> Perhaps it's time to kill them, but I don't know what the defaults are :-)
> 
> > What is the rtt between your two hosts ?
> 
> 35.7–36.0 ms.
> 
> /* Steinar */

Ok, you could try 12 MB instead of 8MB to eventually reach line rate.

net/ipv4/tcp_rmem = 4096 873814 12000000
net/ipv4/tcp_wmem = 4096 873814 12000000