Re: Throughput test for kernelspace module vs. userspace daemon with strange results

[Thomas Mader <thezema@gmail.com>]

Jan Engelhardt wrote:
> You are using a raw socket in userspace, which effectively
> bypasses Netfilter.
> To make a meaningful test of it, the PF_RAW code would need
> an NF_HOOK into iptables to make a more accurate comparison I think.

I don't understand what you mean since I also have a raw socket in 
kernelspace. Is it because I use kernel_sendmsg to send the icmp packet 
in kernelspace? I cannot believe that I get a ~5mbit/s decrease in 
throughput only because the sent icmp packets go through my module in 
kernelspace but not in userspace.

Nevertheless I removed the icmp send stuff from both and tested again. 
Now I get 95.60mbit/s for kernelspace and 95.69mbit/s for userspace. I 
think I can conclude that there is no drawback in throughput performance 
by using the userspace daemon, though the reason for it is still unknown.