[FFmpeg-user] Prevent Circular buffer overrun

Mitja Pirih mitja at alternet.si
Thu Mar 22 15:44:14 EET 2018

On 20. 03. 2018 14:57, Jernej Stopinšek wrote:
> try to play around with kernel parameters and increase values for: 
> net.ipv4.udp_rmem_min 
> net.ipv4.udp_mem 
> net.core.rmem_default 
> net.core.rmem_max 
> net.core.netdev_max_backlog 
> net.core.netdev_budget 
> also check interface Ring parameters: 
> ethtool -g [interface] 
> and increase RX and TX to maximum: 
> in my case: 
> ethtool -G eth0 rx 4096 tx 4096 
> Check out this document: 
> https://blog.packagecloud.io/eng/2016/06/22/monitoring-tuning-linux-networking-stack-receiving-data/ 
> and enable RPS and RFS. 
> This solved my problem with Circular buffer overrun when adding more instances.

Tested your suggestion but it does not help. I've tested from 10% up
from defaults values up to 10x from default values (following a couple
of tuning guides). The only thing I can not test is Ring parameters as I
am getting all multicast traffic on lo (loopback) interface. Still
checking on RPS and RFS if there is any real use on lo as it is a
virtual interface.

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