[asterisk-dev] rtp scalability improvement...

[Tim Panton]

On 20 Mar 2006, at 09:55, Roy Sigurd Karlsbakk wrote:

>> PS: As of number of packets sent thru computer:
>>
>> 50 packets per second * 400 channels * 2 in/out = 40 000 packets  
>> per second.
>>
>> Performance dies not because of system calls, but because 20 000
>> interruptions/sec happened at that moment.
>> It's named IRQ poisoning. Because IRQ switching is longer that  
>> standard
>> task switching.
>> <snip/>
>
> These IRQ storms are only happening on crappy network hardware. My  
> testing was one with intel gigabit NICs with large buffers,  
> effectively producing < 100 interrupts per second. kernel profiling  
> showed time was indeed spent in system calls
>

Yet another reason IAX trunking wins, 50 channels in a trunk means 49  
fewer packets,
hence fewer context switches.

Is there a halfway house here, with a kernel driver that just  
aggregates a number of rtp
packets and hands them all back in one delimited buffer?



> roy
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Tim Panton
tim at mexuar.com