Hello,
attached you will find the results of my todays Xenomai latency
measurements on various PowerPC boards with Linux 2.4 and 2.6.
Wolfgang.
New latency tests with Xenomai on various PowerPC boards
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Board : Processor CPU-Clk Bus-Clk I-Cache D-Cache Memory Kernel Remarks
TQM860L : MPC 860 50 MHz 50 MHz 4 KB 4 kB 16 MB 2.4.25
PM825 : MPC 8260 200 MHz 66 MHz 16 KB 16 kB 128 MB 2.4.25 FPU
Ocotea : AMCC 440GX 533 MHz 152 MHz 32 KB 32 KB 256 MB 2.6.14 DDR-RAM, L2 256 KB
Linux : DENX Linux 2.6.14 or DENX Linux 2.4.25 (linuxppc_2_4_devel)
iPipe : 1.0-02 or 1.1-02
Xenomai: SVN 2006-01-12
LATENCY on TQM860L with load (and -p500):
|-----lat min|-----lat avg|-----lat max|-overrun|---test-time
-t0 | 58240| 122240| 217280| 0| 00:05:00
-t1 | 64480| 97584| 160320| 0| 00:05:00
-t2 | 24640| 48961| 105280| 0| 00:05:00
LATENCY on PM825 with load:
|-----lat min|-----lat avg|-----lat max|-overrun|---test-time
-t0 | 17750| 29125| 64062| 0| 00:05:00
-t1 | 10188| 22413| 50188| 0| 00:05:00
-t2 | 15062| 10754| 38438| 0| 00:05:00
LATENCY on Ocotea with load:
|-----lat min|-----lat avg|-----lat max|-overrun|---test-time
-t0 | 4897| 10815| 27774| 0| 00:05:00
-t1 | 3423| 8316| 23935| 0| 00:05:00
-t2 | 1714| 3701| 12010| 0| 00:05:00
Note: load has been put onto the system by running in a telnet session
"ping -f <remote-host-ip>" and "calibrator ..." (Cache-Memory and
TLB Calibration Tool http://monetdb.cwi.nl/Calibrator/).
Note: all test have been run with CONFIG_XENO_HW_TIMER_LATENCY="1" and
CONFIG_XENO_HW_SCHED_LATENCY="1" to get correct latancy values.
Old latency measurements:
-------------------------
Linux : DENX linux-2.6.14-rc3-g4c234921
iPipe : 1.0-00
Xenomai: SVN 2005-10-15
KLATENCY with load:
|-----lat min|-----lat avg|-----lat max|-overrun|---test-time
TQM860L | 50560| 98976| 199040| 0| 00:09:45
Ocotea | 2953| 5974| 19147| 0| 00:12:05
LATENCY with load:
|-----lat min|-----lat avg|-----lat max|-overrun|---test-time
TQM860L | 60480| 120960| 224320| 0| 00:09:46
Ocotea | 3575| 7438| 24474| 0| 00:10:50
