pf ALTQ bandwidth limited to a 32bit value (4294Mb)

[Greg Hennessy]

Interesting read.

Sounds like you need a BreakingPoint to really give it a workout with real world style traffic profiles and volumes.

Greg

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________________________________
From: Calomel Org
Sent: 07 July 2011 19:41:50
To: Greg Hennessy
Cc: freebsd-pf at freebsd.org
Subject: Re: pf ALTQ bandwidth limited to a 32bit value (4294Mb)

Greg,

Pf performance is quite good. The machine averages 9.2 Gbits/sec or
1.15 gigabytes per second (GB/s) in each direction, simultaneously.

Interrupt load is about 12%. With a single Linux box on either side of
the firewall we see around 161K packets per second and can create 4000
states per second. With more machines on either side on the firewall
we are looking to get closer to a million pps and a higher state
creation rate. I am not sure what limits we will see then.

We published a more detailed write up here under
"Can we achieve 10 gigabit speeds ?"

 Network Tuning and Performance
 https://calomel.org/network_performance.html

--
   Calomel @ https://calomel.org
   Open Source Research and Reference


On Wed, Jul 06, 2011 at 07:09:59PM -0400, Greg Hennessy wrote:
>>
>> ALTQ using hfsc is limited to a maximum parent bandwidth of 4294Mb.
>> This value is 2^32 or 4,294,967,296 bits. If you set the bandwidth any higher,
>> altq will flip back to zero. This "bug" was found when trying to test 10 gigabit
>> and 40 gigabit bandwidth models.
>
>What a problem to have :-)
>
>On a side note out of pure curiousity, what's PF performance like up in the stratosphere under those sort of loads/packet rates ? :-)
>
>
>Greg
>
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