FreeBSD problems and preliminary ways to solve

[Robert N. M. Watson]

On 19 Aug 2011, at 10:05, Slawa Olhovchenkov wrote:

>> Is the issue here that FreeBSD is dropping more packes, or just that FreeBSD 
>> is reporting that it drops packets?  Historically, we've returned ENOBUFS from 
>> datagram sockets when the interface queue is overflowed, but some other 
>> systems (most noticeably Linux) simply return success when they drop a packet 
>> on an outgoing interface queue.  You can debate which is the better model, but 
>> one impact is that sometimes people report errors on FreeBSD that they don't 
>> see on Linux -- when actually, the same failure is present, we just allow the 
>> application to learn about it.
> 
> Historically, Linux on datagram (UDP) socket allow use select, FreeBSD
> -- don't allow. FreeBSD always report 'UDP socket ready to transmit'.
> And after try to send packet -- 'oops, ENOBUFS'.


And if you have two consumers sending UDP on Linux, they both get unreported 50% packet loss, to my understanding?

Robert