new version of polling for FreeBSD 6.x

[Fabien THOMAS]

Le 8 sept. 07 à 01:05, Andre Oppermann a écrit :

> Mike Tancsa wrote:
>> On Thu, 6 Sep 2007 15:12:06 +0200, in sentex.lists.freebsd.net you
>> wrote:
>>> After many years of good services we will stop using FreeBSD 4.x :)
>>> During my performance regression tests under FreeBSD 6.2 i've  
>>> found  that polling has lower performance than interrupt.
>>> To solve that issue i've rewritten the core of polling to be more  
>>> SMP  ready.
>> Hi,
>> 	This is really interesting work!  Reading the pdf file, it
>> seems forwarding performance on 6 and 7 is still much lower than
>> RELENG_4 ?  is that correct ?
>
> Haven't tested RELENG_4 performance in a controlled environment and
> thus can't answer the question directly.  However using fastforward
> on 6 and 7 is key to good performance.  Without it you're stuck at
> some 150-200kpps, perhaps 300kpps.  With it you get to 500-800kpps.

Using net.isr.direct is the key success and can get much better  
forwarding rate (intermediate queue kill the performance).
i aggree than using fastforwarding gets another big step because  
there is a lot less code than on the IP stack:

FreeBSD 6.2 using fastforward on 64bytes packets (L3 Mb/s):

pollng 1CPU: 		156
pollng 2CPU:		123
intr:					144
pollng 1CPU fastfwd: 	221
pollng 2CPU fastfwd:	270
intr fastfwd:        		211

Fabien

>
> -- 
> Andre
>
>> 	---Mike
>>> You can find a summary of all my tests and the source code at  
>>> the  following address:
>>> http://www.netasq.com/opensource/pollng-rev1-freebsd.tgz
>>>
>>> Feel free to ask more detailed information if necessary and  
>>> report  any bugs / comments.
>>>
>>> Fabien
>>>
>>>
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>> --------------------------------------------------------
>> Mike Tancsa, Sentex communications http://www.sentex.net
>> Providing Internet Access since 1994
>> mike at sentex.net, (http://www.tancsa.com)
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>
>