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AF_XDP-interaction: Add results from system with RT kernel

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Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
This commit is contained in:
Jesper Dangaard Brouer
2021-11-24 17:06:25 +01:00
parent 46cc148a03
commit 457a7a5e1e
1 changed files with 13 additions and 1 deletions
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14
AF_XDP-interaction/README.org
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@@ -97,7 +97,7 @@ kernels.
| igc | spin | remote | 1056 ns | 419 ns | 2798 ns | B |
| igc | wakeup | same | 3177 ns | 2210 ns | 9136 ns | B |
| igc | wakeup | remote | 4095 ns | 3029 ns | 10595 ns | B |
| | | | | | | |
|----------+--------+--------+----------------+----------+-------------+--------|
The latency is affected a lot by CPUs power-saving states, which can
be limited globally by changing =/dev/cpu_dma_latency=. (See section
@@ -106,11 +106,23 @@ below). The main difference between system *A* and *B* is that
doesn't use C-states. (Side-note: used tool =tuned-adm profile
latency-performance= thus other tunings might also have happened)
System *RT1* have a Real-Time patched kernel, and =cpu_dma_latency=
have no effect (likely due to kernel config).
| Driver | Test | core | time-delay avg | min | max | System |
|----------+--------+--------+----------------+---------+---------+--------|
| igb/i210 | spin | same | 2577 ns | 2129 ns | 4155 ns | RT1 |
| igb/i210 | spin | remote | 788 ns | 551 ns | 1473 ns | RT1 |
| igb/i210 | wakeup | same | 6209 ns | 5644 ns | 8178 ns | RT1 |
| igb/i210 | wakeup | remote | 5239 ns | 4463 ns | 7390 ns | RT1 |
Systems table:
| Name | CPU @ GHz | Kernel | Kernel options | cpu_dma_latency |
|------+----------------------+-----------------+----------------+----------------------|
| A | E5-1650 v4 @ 3.60GHz | 5.15.0-net-next | PREEMPT | 2 ms (2000000000 ns) |
| B | E5-1650 v4 @ 3.60GHz | 5.15.0-net-next | PREEMPT | 2 ns |
| RT1 | i5-6500TE @ 2.30GHz | 5.13.0-rt1+ | PREEMPT_RT | 2ms, but no-effect |
| | | | | |
** C-states wakeup time