Timing issue with Dummynet on high kernel timer interrupt

[Hans Petter Selasky]

On 11/06/15 17:51, Hans Petter Selasky wrote:
> On 11/06/15 17:43, Ian Lepore wrote:
>> On Fri, 2015-11-06 at 17:28 +0100, Hans Petter Selasky wrote:
>>> Hi,
>
>>
>> Do the test II results change with this setting?
>>
>>    sysctl kern.timecounter.alloweddeviation=0
>>
>
> Yes, it looks much better:
>
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 10012 -> 0
> debug.total: 10012 -> 0
> debug.total: 10012 -> 0
> debug.total: 10013 -> 0
> debug.total: 10012 -> 1
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 10012 -> 0
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
>
> --HPS
>

Thought I still see some unexpected dips, as the test runs for a longer 
amount of time. Not sure what the cause might be.

> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 9844 -> 0
> debug.total: 10013 -> 0
> debug.total: 10013 -> 0
> debug.total: 10012 -> 0

--HPS