Timing issue with Dummynet on high kernel timer interrupt
Hans Petter Selasky
hps at selasky.org
Fri Nov 6 16:55:50 UTC 2015
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
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