On schedulers

Thu Aug 2 12:25:20 UTC 2007

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Ivan Voras wrote:
> Hi,
> 
> I've just stumbled on the LKML (via Slashdot) discussion on schedulers,
> nicely compiled here: http://kerneltrap.org/node/14023 . I don't think
> 3D performance is of concern for FreeBSD, but I'm wondering how would
> ULE and the latest incarnation of 4BSD fare in that discussion?
> 
> Specifically, I'm interested in this result in Linux:
> 
>          2.6.22-ck1                         2.6.22-cfs-v19
>    ------------------------            ------------------------
>    quake + 0 loops | 41 fps            quake + 0 loops | 41 fps
>    quake + 1 loop  |  3 fps            quake + 1 loop  | 41 fps
>    quake + 2 loops |  2 fps            quake + 2 loops | 32 fps
>    quake + 3 loops |  1 fps            quake + 3 loops | 24 fps
>    quake + 4 loops |  0 fps            quake + 4 loops | 20 fps
>    quake + 5 loops |  0 fps            quake + 5 loops | 16 fps
> 
> (for the impatient: the benchmark is of running quake with several "idle
> loop" processes, presumably on a single CPU machine. On the left is the
> SD (staircase deadline) and on the right is the CF (completely fair)
> scheduler).
> 
> How would this behave on FreeBSD? Is there a paper on how ULE should
> behave / is modeled?
> 

This is on a Intel C2D E6420 with 2G of ram,
Nvidia 7900GTO (nvidia-driver-1.0.9746)
running xorg-server-6.9.0_5 on a recent -CURRENT :

idle is basicaly a small C program with just for(;;); in its main()
function.
I've run glxgears for 20 secs each (to get four reports)
Both idle and glxgears are run as normal user.

SMP+ULE 0 idle
101446 frames in 5.0 seconds = 20289.099 FPS
101590 frames in 5.0 seconds = 20317.975 FPS
101701 frames in 5.0 seconds = 20340.037 FPS
101489 frames in 5.0 seconds = 20297.670 FPS

SMP+ULE 1 idle
97430 frames in 5.0 seconds = 19485.840 FPS
102176 frames in 5.0 seconds = 20435.017 FPS
102402 frames in 5.0 seconds = 20480.318 FPS
102430 frames in 5.0 seconds = 20485.865 FPS

SMP+ULE 2 idle
30 frames in 5.0 seconds =  5.978 FPS
31 frames in 5.0 seconds =  6.182 FPS
31 frames in 5.0 seconds =  6.172 FPS
30 frames in 5.2 seconds =  5.744 FPS

SMP+ULE 3 idle
29 frames in 5.2 seconds =  5.631 FPS
30 frames in 5.0 seconds =  5.952 FPS
31 frames in 5.1 seconds =  6.054 FPS
32 frames in 5.2 seconds =  6.213 FPS

SMP+ULE 4 idle
21 frames in 5.1 seconds =  4.151 FPS
20 frames in 5.1 seconds =  3.942 FPS
21 frames in 5.2 seconds =  4.066 FPS
20 frames in 5.2 seconds =  3.841 FPS

UP+ULE 0 idle
102152 frames in 5.0 seconds = 20430.299 FPS
102572 frames in 5.0 seconds = 20514.236 FPS
102533 frames in 5.0 seconds = 20506.522 FPS
102129 frames in 5.0 seconds = 20425.654 FPS

UP+ULE 1 idle
21 frames in 5.1 seconds =  4.158 FPS
24 frames in 5.2 seconds =  4.624 FPS
26 frames in 5.0 seconds =  5.153 FPS
28 frames in 5.0 seconds =  5.586 FPS

UP+ULE 2 idle
21 frames in 5.1 seconds =  4.093 FPS
21 frames in 5.1 seconds =  4.093 FPS
21 frames in 5.1 seconds =  4.115 FPS
21 frames in 5.1 seconds =  4.115 FPS

UP+ULE 3 idle
20 frames in 5.3 seconds =  3.804 FPS
19 frames in 5.2 seconds =  3.624 FPS
19 frames in 5.2 seconds =  3.619 FPS
19 frames in 5.3 seconds =  3.612 FPS

UP+ULE 4 idle
19 frames in 5.3 seconds =  3.600 FPS
17 frames in 5.0 seconds =  3.388 FPS
17 frames in 5.0 seconds =  3.393 FPS
17 frames in 5.0 seconds =  3.380 FPS

SMP+4BSD 0 idle
102440 frames in 5.0 seconds = 20487.893 FPS
102285 frames in 5.0 seconds = 20456.848 FPS
102276 frames in 5.0 seconds = 20455.065 FPS
102312 frames in 5.0 seconds = 20462.289 FPS

SMP+4BSD 1 idle
101798 frames in 5.0 seconds = 20359.526 FPS
102732 frames in 5.0 seconds = 20546.202 FPS
102619 frames in 5.0 seconds = 20523.692 FPS
102788 frames in 5.0 seconds = 20557.526 FPS

SMP+4BSD 2 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

SMP+4BSD 3 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

SMP+4BSD 4 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

UP+4BSD 0 idle
102864 frames in 5.0 seconds = 20572.665 FPS
102569 frames in 5.0 seconds = 20513.792 FPS
102559 frames in 5.0 seconds = 20511.775 FPS
102333 frames in 5.0 seconds = 20466.543 FPS

UP+4BSD 1 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

UP+4BSD 2 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

UP+4BSD 3 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS

UP+4BSD 4 idle
6 frames in 5.0 seconds =  1.193 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
5 frames in 5.0 seconds =  0.994 FPS
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