Hello RTAI'ers,
I tried lxrt with RTAI-1.5 on 2.2.16 and found that the latency was
rather high when i did something with the
X-Server , like moving windows. So i though oh well it is lxrt , can't
expect extern low latency with that
so i ran the lateny test in
/usr/src/rtai-1.5/examples/latency_calibration and found out it had the
same problem.
Here is what i did:
1) compiled all the stuff
2) maximized a gnome-termnial 1.2.4
3) ran the test in the window
4) everything fine max of about 15 usec
5) put an other gnometerm half over it
6) bang the max jumps to 15msec
7) removed the other term again and it drops to 15usec again
8) tried to remove the ONE_SHOT define in the test , but that had no
effect
9) when pressing enter durring the test there is a jump too
Now my question is: what am i doing wrong, or it this behavior correct
:-) ?
TIA,
Erwin
My system:
ASUS AV7 (VIA KT133 chipset)
Athlon TB 800MHz
Infinion PC133 128MB DIMM
Haupauge WinTV card (module not loaded)
Dawicontrol (DC 2975U) SCSI controler (only for CD-rom and scanner)
HD IBM-DJNA-371350
NIC VIA chipset (dunno the cardbrand)
G-card: S3 Inc. ViRGE/DX or /GX (rev 1).
(see proc/pci below)
Software:
Kernel 2.2.16
RTAI 1.5
XFree 4.0.1
updated RH 6.2 install
compiler egcs-2.91.66
glibc 2.1.3
modutils 2.3.17
kernel output of calibration:
Nov 19 12:41:53 rawpower kernel: ***** STARTING THE REAL TIME UP
SCHEDULER WITH NO LINUX *****
Nov 19 12:41:53 rawpower kernel: ***** FP SUPPORT AND READY FOR A
PERIODIC TIMER *****
Nov 19 12:41:53 rawpower kernel: ***<> LINUX TICK AT 100 (HZ) <>***
Nov 19 12:41:53 rawpower kernel: ***<> CALIBRATED CPU FREQUENCY
807213000 (HZ) <>***
Nov 19 12:41:53 rawpower kernel: ***<> CALIBRATED
8254-TIMER-INTERRUPT-TO-SCHEDULER LATENCY 3171 (ns) <>***
Nov 19 12:41:53 rawpower kernel: ***<> CALIBRATED ONE SHOT SETUP TIME
2828 (ns) <>***
Here a print out of the test:
*** min: -743, max: 4871 average: 640 ***
*** min: -839, max: 7863 average: 639 ***
*** min: -835, max: 7400 average: 496 ***
*** min: -716, max: 7767 average: 488 ***
*** min: -798, max: 7282 average: 514 ***
*** min: -816, max: 9258 average: 517 ***
*** min: -749, max: 10473 average: 524 ***
*** min: -697, max: 11074 average: 553 ***
*** min: -816, max: 11100 average: 534 ***
*** min: -649, max: 11973 average: 534 ***
*** min: -894, max: 4207901 average: 23581 *** <------ put
a other Xterm over the out put window
*** min: -742, max: 15357958 average: 297999 ***
*** min: -854, max: 15300465 average: 295876 ***
*** min: -891, max: 14982212 average: 284012 ***
*** min: -824, max: 14912340 average: 281128 ***
*** min: -452, max: 15320521 average: 296448 ***
*** min: -653, max: 15273939 average: 294638 ***
*** min: -586, max: 15296113 average: 295528 ***
*** min: -850, max: 15317780 average: 296337 ***
*** min: -398, max: 15321168 average: 296461 ***
*** min: -645, max: 15306613 average: 296006 ***
*** min: -824, max: 15301681 average: 295769 ***
*** min: -5151, max: 15260932 average: 294135 ***
*** min: -590, max: 15112233 average: 288549 ***
*** min: -642, max: 14919694 average: 281243 ***
*** min: -406, max: 14676508 average: 272180 ***
*** min: -701, max: 14391389 average: 261751 ***
*** min: -545, max: 14332357 average: 259660 ***
*** min: -5796, max: 14362163 average: 260682 ***
*** min: -530, max: 14577379 average: 268495 ***
*** min: -2460, max: 14764780 average: 275409 ***
*** min: -768, max: 15343923 average: 297346 ***
*** min: -850, max: 181432 average: 690 *** <-----
removed it again
*** min: -861, max: 10618 average: 463 ***
*** min: -816, max: 10887 average: 472 ***
*** min: -716, max: 9535 average: 508 ***
*** min: -697, max: 8129 average: 492 ***
*** min: -894, max: 44331561 average: 320511 *** <----- after one
press on the return key
*** min: -735, max: 5448 average: 457 ***
*** min: -909, max: 7268 average: 456 ***
*** min: -846, max: 44267793 average: 313418 *** <--- and again
*** min: -854, max: 10798 average: 465 ***
*** min: -790, max: 10415 average: 463 ***
/proc/pci
PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies Unknown device (rev 2).
Vendor id=1106. Device id=305.
Medium devsel. Master Capable. No bursts.
Prefetchable 32 bit memory at 0xe0000000 [0xe0000008].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies Unknown device (rev 0).
Vendor id=1106. Device id=8305.
Medium devsel. Master Capable. No bursts.
Bus 0, device 4, function 0:
ISA bridge: VIA Technologies Unknown device (rev 34).
Vendor id=1106. Device id=686.
Medium devsel. Master Capable. No bursts.
Bus 0, device 4, function 1:
IDE interface: VIA Technologies VT 82C586 Apollo IDE (rev 16).
Medium devsel. Fast back-to-back capable. Master Capable.
Latency=32.
I/O at 0xd800 [0xd801].
Bus 0, device 4, function 2:
USB Controller: VIA Technologies VT 82C586 Apollo USB (rev 16).
Medium devsel. IRQ 15. Master Capable. Latency=32.
I/O at 0xd400 [0xd401].
Bus 0, device 4, function 3:
USB Controller: VIA Technologies VT 82C586 Apollo USB (rev 16).
Medium devsel. IRQ 15. Master Capable. Latency=32.
I/O at 0xd000 [0xd001].
Bus 0, device 4, function 4:
Host bridge: VIA Technologies Unknown device (rev 48).
Vendor id=1106. Device id=3057.
Medium devsel. Fast back-to-back capable.
Bus 0, device 9, function 0:
Ethernet controller: VIA Technologies Unknown device (rev 6).
Vendor id=1106. Device id=3043.
Medium devsel. IRQ 15. Master Capable. Latency=64. Min
Gnt=118.Max Lat=152.
I/O at 0xa400 [0xa401].
Non-prefetchable 32 bit memory at 0xdd800000 [0xdd800000].
Bus 0, device 11, function 0:
Multimedia video controller: Brooktree Bt878 2nd Contr. (?) (rev 2).
Medium devsel. Fast back-to-back capable. IRQ 10. Master
Capable. Latency=32. Min Gnt=16.Max Lat=40.
Prefetchable 32 bit memory at 0xdf000000 [0xdf000008].
Bus 0, device 11, function 1:
Multimedia controller: Brooktree Bt878 (rev 2).
Medium devsel. Fast back-to-back capable. IRQ 10. Master
Capable. Latency=32. Min Gnt=4.Max Lat=255.
Prefetchable 32 bit memory at 0xde800000 [0xde800008].
Bus 0, device 12, function 0:
VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 1).
Medium devsel. IRQ 5. Master Capable. Latency=32. Min
Gnt=4.Max Lat=255.
Non-prefetchable 32 bit memory at 0xd8000000 [0xd8000000].
Bus 0, device 13, function 0:
SCSI storage controller: NCR 53c875 (rev 38).
Medium devsel. IRQ 15. Master Capable. Latency=134. Min
Gnt=17.Max Lat=64.
I/O at 0xa000 [0xa001].
Non-prefetchable 32 bit memory at 0xd7800000 [0xd7800000].
Non-prefetchable 32 bit memory at 0xd7000000 [0xd7000000].
Bus 0, device 17, function 0:
Unknown mass storage controller: Promise Technology Unknown device
(rev 2).
Vendor id=105a. Device id=d30.
Medium devsel. IRQ 10. Master Capable. Latency=32.
I/O at 0x9800 [0x9801].
I/O at 0x9400 [0x9401].
I/O at 0x9000 [0x9001].
I/O at 0x8800 [0x8801].
I/O at 0x8400 [0x8401].
Non-prefetchable 32 bit memory at 0xd6800000 [0xd6800000].
/proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 4
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 807.213
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr 6 mce cx8 sep mtrr pge 14 cmov
fcmov 17 psn 22 mmx 24 30 3dnow
bogomips : 1612.19
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