[erlang-questions] Gen_UDP Packet Loss

[Lee Sylvester]

Thanks, Mike.  I tried that, but it hasn’t made any changes :-(

Lee


On 30 Jul 2014, at 21:07, Michael.K.Schmidt@REDACTED wrote:

> 
> Don't you want to adjust the UDP (not TCP) settings? something like
> 
> sysctl -w net.inet.udp.recvspace=1048576
> 
> I don't know if this still applies, but there is a writeup here on how to
> increase maxsockbuf:
> http://lists.apple.com/archives/darwin-kernel/2012/Apr/msg00042.html
> 
> # tell the system to use more than the
> # default 32768 mbufclusters via the ncl boot arg
> nvram boot-args="ncl=131072"
> 
> (reboot)
> 
> sysctl -w kern.ipc.maxsockbuf=16777216
> sysctl -w net.inet.udp.recvspace=8388608
> 
> 
> Hope that helps,
> Mike
> 
> 
> erlang-questions-bounces@REDACTED wrote on 07/30/2014 02:24:56 PM:
> 
>> Lee Sylvester <lee.sylvester@REDACTED>
>> Sent by: erlang-questions-bounces@REDACTED
>> 
>> 07/30/2014 02:24 PM
>> 
>> To
>> 
>> Max Lapshin <max.lapshin@REDACTED>,
>> 
>> cc
>> 
>> "Erlang Users' List" <erlang-questions@REDACTED>
>> 
>> Subject
>> 
>> Re: [erlang-questions] Gen_UDP Packet Loss
>> 
>> Okay, so I’m updating them using
>> 
>> sysctl -w kern.ipc.maxsockbuf=16777216
>> sysctl -w net.inet.tcp.sendspace=1048576
>> sysctl -w net.inet.tcp.recvspace=1048576
>> 
>> Apparently that produces the same result.  16777216 is reported as
>> too large for the maxsockbuf, though.  I’m on a Macbook Pro with
>> 8Gb.  :rolleyes:
>> 
>> Lee
>> 
>> On 30 Jul 2014, at 20:06, Max Lapshin <max.lapshin@REDACTED> wrote:
>> 
>> I've spent lot of time to make capturing of 600 mbit/s of udp
>> traffic without loss.
>> 
>> Don't specify buffer size in erlang, use system variables.
>> 
>> 
>> 
>> 
>> sysctl -w net.core.rmem_max=1048576
>> sysctl -w net.core.rmem_default=1048576
>> sysctl -w net.ipv4.udp_mem="8388608 12582912 16777216"
>> 
>> 
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