RTAI Testsuite LiveCD

Hardware

CPU

name	value
CPU name:	(R) Pentium(R) M processor 1.70GHz
CPU vendor:	GenuineIntel
CPU family:	6
CPU model:	13
CPU stepping:	6
CPU cache:	2048 KB
CPU frequency:	1699

PCI devices

The following table shows all PCI devices that were plugged in the testmachine during the testrun.

category	name
PCI bridge	Intel Corp. 82801 PCI Bridge (rev 81)
CardBus bridge	Texas Instruments PCI4520 PC card Cardbus Controller (rev 01)
USB Controller	Intel Corp. 82801DB/DBM (ICH4/ICH4-M) USB 2.0 EHCI Controller (rev 01)
USB Controller	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
USB Controller	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
PCI bridge	Intel Corp. 82855PM Processor to AGP Controller (rev 03)
USB Controller	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
Host bridge	Intel Corp. 82855PM Processor to I/O Controller (rev 03)
Ethernet controller	Intel Corp. 82540EP Gigabit Ethernet Controller (Mobile) (rev 03)
Network controller	Intel Corp. PRO/Wireless 2200BG (rev 05)
Multimedia audio controller	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
Modem	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Controller (rev 01)
IDE interface	Intel Corp. 82801DBM (ICH4) Ultra ATA Storage Controller (rev 01)
ISA bridge	Intel Corp. 82801DBM LPC Interface Controller (rev 01)
SMBus	Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 01)
VGA compatible controller	ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]

Testresults

BYTE nbench benchmark

The following results were acquired using the Linux port of release 2 of BYTE Magazine's BYTEmark benchmark program.

RTAI testsuite

UP scheduler - latency

The difference in time between the expected switch time and the time when a task is actually called by the scheduler is measured. For this test the RTAI UP scheduler is used.

LXRT scheduler - latency

The difference in time between the expected switch time and the time when a task is actually called by the scheduler is measured. For this test the RTAI LXRT scheduler is used.

UP scheduler - preemption

The following table shows the results of a stress test aimed at verifying that the schedulers preempt well under intense load. It is a simple test that combines the latency calibration task with a fast and slow task in such a way to have two levels of preemption, nesting on an odd number of tasks. It shows the maximum jitter of the fast task, which has the second highest priority, and of the slow which has the lowest priority. Reasonable jitters are a clear indication of preemption.

LXRT scheduler - preemption

The following table shows the results of a stress test aimed at verifying that the schedulers preempt well under intense load. It is a simple test that combines the latency calibration task with a fast and slow task in such a way to have two levels of preemption, nesting on an odd number of tasks. It shows the maximum jitter of the fast task, which has the second highest priority, and of the slow which has the lowest priority. Reasonable jitters are a clear indication of preemption.