Re: [PATCH 00/18 v2] Improving latency of short slice tasks

[Kayra Cizmeci <kayracizmeci@gmail.com>]

Hi All,

I wanted to ran some tests for this patch series. I couldn't really
apply it without some issues, but I think I managed to apply
it cleanly this time... Tho I may have been doing something wrong.
Please let me know if so.

base: 4a3b51aab6e25244d97936aa65e6d5425adf98e1 (on tip/sched/core)

Command Used Each Run:

hackbench -g 4 -l 100000 > /dev/null & sudo chrt -o -T 300000 0 ~/rt-tests/cyclictest --policy=other -t 1 -i 1000 -D 20 -q -m; wait

Environment:

Zen 3 with 8 Cores and 16 Threads. And Fedora.

THE RESULTS (COOKED):

On Base in 5 runs, average values are: Min: 3.8, Act: 5.8, Avg: 8.8 and
Max: 2511.6 (I need tea.)

On Base + Patches in 5 runs, average values bla bla you get it:
Min 4, Act: 5.8, Avg: 7.2 and Max: 1781.6

Or, in the shape of art made with love and passion:

 +------BASE-----+--PATCHED--+
 | MIN   3.8     |    4      |
 | ACT   5.8     |   5.8     |
 | AVG   8.8     |   7.2     |
 | MAX  2511.6   |  1781.6   |
 +--------------+------------+ 

Hmhp... Hope I'm not missing something. I need water. Bah.

Tested-by: Kayra Cizmeci <kayracizmeci@gmail.com>

Dancing donkey chases a car while shouting "Linux is the best, my dancing is the coolest. Cry."

Thanks,
Kayra



I'll add other not too important things below, these are pretty raw.
But if you wanna have a look you can.


THE RESULTS (RAW):

BASE 7.3.0-rc1+ #2:

RUN 1:
[1] 1950
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2115) P: 0 I:1000 C:  19990 Min:      4 Act:    6 Avg:    8 Max:    1885
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 2:
[1] 2132
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2297) P: 0 I:1000 C:  19990 Min:      4 Act:    6 Avg:    9 Max:    2695
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

linuxfucks@micro-softly:~$ (Opsies. Who's hostname is this? It's so cool. Wow. 'linuxfucks')

RUN 3: 
[1] 2307
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2472) P: 0 I:1000 C:  19988 Min:      4 Act:    5 Avg:    8 Max:    3246
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 4:
[1] 2493
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2658) P: 0 I:1000 C:  19995 Min:      3 Act:    6 Avg:    9 Max:    1991
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 5:
[1] 2671
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2836) P: 0 I:1000 C:  19992 Min:      4 Act:    6 Avg:   10 Max:    2741
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

BASE + PATCHES 7.3.0-rc1+ #3:

RUN 1:
[1] 1490
# /dev/cpu_dma_latency set to 0us
T: 0 ( 1657) P: 0 I:1000 C:  19993 Min:      4 Act:    5 Avg:    7 Max:    3091
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 2:
[1] 1671
# /dev/cpu_dma_latency set to 0us
T: 0 ( 1836) P: 0 I:1000 C:  19999 Min:      4 Act:    6 Avg:    7 Max:    1529
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 3:
[1] 1848
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2013) P: 0 I:1000 C:  19998 Min:      4 Act:    6 Avg:    7 Max:    1455
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 4:
[1] 2023
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2188) P: 0 I:1000 C:  19995 Min:      4 Act:    6 Avg:    7 Max:    1524
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null

RUN 5:
[1] 2200
# /dev/cpu_dma_latency set to 0us
T: 0 ( 2365) P: 0 I:1000 C:  19989 Min:      4 Act:    6 Avg:    8 Max:    1309
[1]+  Done                       hackbench -g 4 -l 100000 > /dev/null