timing errors
[email protected] Thu, 4 Jan 2007 10:32:00 +0200
| Newsgroups | gmane.linux.real-time.rtlinux.general |
|---|---|
| Message-ID | <[email protected]> |
Hello again,
I have ran the examples/measurement test and the results are not so
consistent as seen below.
ACPI and Power Management support was disabled from kernel. Test environment is:
rtlinux-3.2-pre3
prepatched-linux-2.4.29
pentium mobile 2 ghz cpu
absolute = 0;
mode = 0;
advance = 0;
bperiod = 0;
also commented negatif sign check of diff :
/*if (diff < 0) {
diff = -diff;
}*/
Now starting the application
The "min" is the smallest timing error
A negative value means that the task ran too early
The "max" is the largest timing error
min: -608, max: 768
min: -192, max: 320
min: -192, max: 224
min: -192, max: 192
min: -260480, max: 260608
min: -192, max: 192
min: -192, max: 192
min: -160, max: 192
min: -192, max: 224
min: -320, max: 288
min: -30176, max: 30112
min: -192, max: 256
min: -297280, max: 297184
min: -160, max: 224
min: -160, max: 192
min: -192, max: 160
min: -160, max: 128
min: -192, max: 224
min: -62368, max: 62496
min: -192, max: 192
min: -296320, max: 296320
min: -192, max: 224
min: -192, max: 224
min: -192, max: 224
min: -192, max: 160
min: -192, max: 224
min: -84992, max: 85056
min: -192, max: 160
min: -324576, max: 324736
min: -160, max: 192
min: -192, max: 224
min: -192, max: 320
min: -160, max: 224
min: -192, max: 352
min: -192, max: 192
Why so big values among them? I have tested same code on a platform
with pentium IV 2Ghz and results are not better but consistent.
Regards,
Deniz.
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