Re: [RFC v2 net-next 00/10] Time based packet transmission

On Wed, Jan 17, 2018 at 03:06:11PM -0800, Jesus Sanchez-Palencia wrote:

First, a baseline test was ran for 10 minutes with the plain kernel only:

|                 | plain kernel @ 1ms |
|-----------------+--------------------+
| min (ns):       |    +4.820000e+02   |
| max (ns):       |    +9.999300e+05   |
| pk-pk:          |    +9.994480e+05   |

...

|                 |    tbs SW @ 1ms   |  tbs HW @ 1ms  | tbs HW @ 250 us |
|-----------------+-------------------+----------------+-----------------|
| min (ns):       |    +1.510000e+02  |  +4.420000e+02 |   +4.260000e+02 |
| max (ns):       |    +9.977030e+05  |  +5.060000e+02 |   +5.060000e+02 |
| pk-pk:          |    +9.975520e+05  |  +6.400000e+01 |   +8.000000e+01 |

I wonder about these worst case measurements of 999 and 998
milliseconds.  It almost looks like you missed one entire period.
Could this simply be a bug in the test setup?

Thanks,
Richard