Hello,
These were the scheduling latency and interrupt
latency test results on ppc and x86 with IPIPE tracer
option disabled.
1.Please comment on these results (whether valid) and
2.Is there any method to optimize these results.
1)PPC:-
(MPC-860 at 48 MHz, 4 kB I-Cache and 4 kB D-Cache)
User mode:-
[EMAIL PROTECTED]:/mnt/out_xen/bin# ./latency -t0
== Sampling period: 1000000 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 1000000 us
period, priority 99)
RTH|-----lat min|-----lat
avg|-----latmax|-overrun|----lat best|---lat worst
RTD| 167.000| 167.000| 167.000| 0|
167.000| 167.000
RTD| 176.000| 176.000| 176.000| 0|
167.000| 176.000
RTD| 168.000| 168.000| 168.000| 0|
167.000| 176.000
RTD| 171.000| 171.000| 171.000| 0|
167.000| 176.000
Kernel mode:-
[EMAIL PROTECTED]:/mnt/out_xen/bin# ./latency -t1
== Sampling period: 1000000 us
== Test mode: in-kernel periodic task
== All results in microseconds
warming up...
RTT| 00:00:00 (in-kernel periodic task, 1000000 us
period, priority 99)
RTH|-----lat min|-----lat
avg|-----latmax|-overrun|----lat best|---lat worst
RTD| 123.000| 123.000| 123.000| 0|
123.000| 123.000
RTD| 125.000| 125.000| 125.000| 0|
123.000| 125.000
RTD| 128.333| 128.333| 128.333| 0|
123.000| 128.333
RTD| 127.000| 127.000| 127.000| 0|
123.000| 128.333
Interrupt mode:-
[EMAIL PROTECTED]:/mnt/out_xen/bin# ./latency -t2
== Sampling period: 1000000 us
== Test mode: in-kernel timer handler
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel timer handler, 1000000 us
period, priority 99)
RTH|-----lat min|-----lat
avg|-----latmax|-overrun|----lat best|---lat worst
RTD| 45.334| 45.334| 45.334| 0|
45.334| 45.334
RTD| 45.000| 45.000| 45.000| 0|
45.000| 45.334
RTD| 46.000| 46.000| 46.000| 0|
45.000| 46.000
RTD| 47.334| 47.334| 47.334| 0|
45.000| 47.334
RTD| 46.334| 46.334| 46.334| 0|
45.000| 47.334
2)X86:-
(Pentium4, 3.06GHz, 1024 KB cache size)
User mode:-
Sampling period: 100 us
== Test mode: in-kernel periodic task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 100 us
period, priority 99)
RTH|-----lat min|-----lat avg|-----lat
max|-overrun|----lat best|---lat worst
RTD| 3.807| 12.825| 21.565| 0|
3.807| 21.565
RTD| 3.796| 12.792| 21.483| 0|
3.796| 21.565
RTD| 3.770| 12.799| 21.501| 0|
3.770| 21.565
RTD| 3.578| 12.806| 20.890| 0|
3.578| 21.565
RTD| 3.755| 12.809| 21.486| 0|
3.578|
kernel mode:-
Sampling period: 100 us
== Test mode: in-kernel periodic task
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel periodic task, 100 us
period, priority 99)
RTH|-----lat min|-----lat avg|-----lat
max|-overrun|----lat best|---lat worst
RTD| 2.381| 3.451| 19.620| 0|
2.381| 19.620
RTD| 2.332| 3.480| 19.930| 0|
2.332| 19.930
RTD| 2.382| 3.649| 19.609| 0|
2.332| 19.930
RTD| 2.323| 2.786| 14.351| 0|
2.323| 19.930
RTD| 2.375| 2.532| 5.519| 0|
2.323| 19.930
RTD| 2.332| 3.971| 19.617| 0|
2.323| 19.930
Interrupt mode:-
Sampling period: 100 us
== Test mode: in-kernel timer handler
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel timer handler, 100 us
period, priority 99)
RTH|-----lat min|-----lat avg|-----lat
max|-overrun|----lat best|---lat worst
RTD| -1.563| 7.553| 15.736| 0|
-1.563| 15.736
RTD| -1.579| 7.558| 15.804| 0|
-1.579| 15.804
RTD| -1.584| 7.529| 16.167| 0|
-1.584| 16.167
RTD| -1.548| 7.553| 16.186| 0|
-1.584| 16.186
RTD| -1.585| 7.556| 16.275| 0|
-1.585| 16.275
Thanks,
Poornima
--- Wolfgang Grandegger <[EMAIL PROTECTED]> wrote:
> Hello,
>
> poornima r wrote:
> > Hello,
> >
> > Srry for not replying all these days...
> > (Was not in in station, may be too personal!!!!!)
> >
> > About software emulation error:
> >
> > 4)Output of /proc/xenomai/faults after the illegal
> >>> instruction:-
> >>> [EMAIL PROTECTED]:/mnt/out_xen/bin# cat
> >>> /proc/xenomai/faults
> >>> TRAP CPU0
> >>> 0: 0 (Data or instruction
> access)
> >>> 1: 0 (Alignment)
> >>> 2: 0 (Altivec unavailable)
> >>> 3: 0 (Program check exception)
> >>> 4: 0 (Machine check exception)
> >>> 5: 0 (Unknown)
> >>> 6: 0 (Instruction breakpoint)
> >>> 7: 0 (Run mode exception)
> >>> 8: 0 (Single-step exception)
> >>> 9: 0 (Non-recoverable exception)
> >>> 10: 1 (Software emulation)
> >>> 11: 0 (Debug)
> >>> 12: 0 (SPE)
> >>> 13: 0 (Altivec assist)
> >> Hm, I see a software emulation exception which is
> >> also the reason for
> >> the illegal instructions. What toolchain do you
> use?
> >> The toolchain
> >> should support software FP emulation.
> >
> > 1)I am using open source too chain with software
> > floating point emulation support.
> > (#ppc_8xx-gcc --v
> >
>
/lib/gcc/powerpc/3.4.3/../../../../target_powerpc/usr/include/c++/3.4.3
> > --with-numa-policy=no --with-float=soft)
> >
> > 2)And the kernel is included with code to emulate
> a
> > floating-point
>
> > unit, which will allow programs that
> > use floating-point
>
> > instructions to run
> >
> > Kernel configuration
> > ----CONFIG_MATH_EMULATION:y
>
> If you build with "--with-float=soft" there is no
> need for math
> emulation in the kernel. Likely, there is something
> wrong with your
> tool-chain. Could you please try a known-to-work
> tool-chain like the
> ELDK v4.x from http://www.denx.de.
>
> Wolfgang.
>
> > Thanks,
> > Poornima
> >
> > --- Wolfgang Grandegger <[EMAIL PROTECTED]> wrote:
> >
> >> poornima r wrote:
> >>> Hi,
> >>>
> >>> 1)I am using open source kernel from Kernel.org,
> >>> but what is meant by vanilla kernel from
> >> Kernel.org?
> >>
> >> It's the kernel from kernel.org. This means that
> the
> >> Linux kernel 2.6.18
> >> is running fine on your MPC860 platform as is?
> >> Thanks for the info.
> >>
> >>> 2)With sampling period of 500usec the system
> >> simply
> >>> hangs without printing any results (./latenct
> >> -p500)
> >>
> >> OK.
> >>
> >>> 3)cyclictest with -t1 option (without
> >> IPIPE-tracer)
> >>> [EMAIL PROTECTED]:/mnt/out_xen/bin#
> ./cyclictest
> >> -t1
> >>> 2.04 0.50 0.17 8/27 174
> >>>
> >>> T: 0 ( 0) P:99 I: 1000 C: 0 Min:
> >> 1000000
> >>> Act: 0 Avg: 0 Max:-1000000
> >>> Illegal instruction
> >>>
> >>> 4)Output of /proc/xenomai/faults after the
> illegal
> >>> instruction:-
> >>> [EMAIL PROTECTED]:/mnt/out_xen/bin# cat
> >>> /proc/xenomai/faults
> >>> TRAP CPU0
> >>> 0: 0 (Data or instruction
> access)
> >>> 1: 0 (Alignment)
> >>> 2: 0 (Altivec unavailable)
> >>> 3: 0 (Program check exception)
> >>> 4: 0 (Machine check exception)
> >>> 5: 0 (Unknown)
> >>> 6: 0 (Instruction breakpoint)
> >>> 7: 0 (Run mode exception)
> >>> 8: 0 (Single-step exception)
> >>> 9: 0 (Non-recoverable exception)
> >>> 10: 1 (Software emulation)
> >>> 11: 0 (Debug)
> >>> 12: 0 (SPE)
> >>> 13: 0 (Altivec assist)
> >> Hm, I see a software emulation exception which is
> >> also the reason for
> >> the illegal instructions. What toolchain do you
> use?
> >> The toolchain
> >> should support software FP emulation.
> >>
> >>> 5)Running switchtest:-
> >>> [EMAIL PROTECTED]:/mnt/out_xen/bin#
> ./switchtest
> >> -n
> >>> --The system hangs wihtout printing any results
> >>>
> >>> Thanks,
> >>> Poornima
> >>>
> >>>
> >>> --- Wolfgang Grandegger <[EMAIL PROTECTED]>
> wrote:
> >>>
> >>>> poornima r wrote:
> >>>>> Hi,
> >>>>>
> >>>>> Thanks for the reply.
> >>>>>
> >>>>> Linux version:linux-2.6.18
> >>>>> Xenomai: xenomai-2.3.0 (Stable version)
> >>>>> adeos patch:
> adeos-ipipe-2.6.18-ppc-1.5-01.patch
> >>>> OK, I'm curious, did you use the vanilla kernel
> >> from
> >>>> kernel.org?
> >>>> More comments below.
> >>>>
> >>>>> The tests were run as follows:
> >>>>> 1)The sampling period in the code for latency
> >> and
> >>>>> switchbench was changed to 1000000000ns(to
> >> remove
> >>>>> overrun error)
> >>>>> 2)switchtest was run with -n5 option
> >>>>> 3)cyclictest was run with -t5 option(5
> threads
> >>>>> were created.)
> >>>>> 4)cyclictest was terminated with Illegal
> >>>> instruction
> >>>>> (after creating 5 threads) with IPIPE tracer
> >>>> enabled.
> >>>>
> >>>>> These were the results without I-PIPE Tracer
> >>>> option:
> >>>>> (All the tests were run without any load)
> >>>>> 1)LATENCY TEST:-
> >>>>> User mode:-
> >>>>> /mnt/out_xen/bin# ./latency -t0
> >>>>> == Sampling period: 1000000 us
> >>>>> == Test mode: periodic user-mode task
> >>>>> == All results in microseconds
> >>>>> warming up...
> >>>>> RTT| 00:00:01 (periodic user-mode task,
> >> 1000000
> >>>> us
> >>>>> period, priority 99)
> >>>>> RTH|-----lat min|-----lat avg|-----lat
> >>>>> max|-overrun|----lat best|---lat worst
> >>>>> RTD| 167.000| 167.000| 167.000|
>
> >>>> 0|
> >>>>> 167.000| 167.000
> >>>>> RTD| 176.000| 176.000| 176.000|
>
> >>>> 0|
> >>>>> 167.000| 176.000
> >>>>> RTD| 168.000| 168.000| 168.000|
>
> >>>> 0|
> >>>>> 167.000| 176.000
>
=== message truncated ===
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