[Xenomai] Fwd: Latency test fails. Problem during installation

[Xenomai] Fwd: Latency test fails. Problem during installation

[Michele Belotti]

Hello everybody,
We recently migrated my project on a new and more powerful workstation but
I can obtain the previous performance.

We observed by running the standard Xenomai tools that there are very high
latencies, hinting for an issue in the kernel configuration (or maybe
unsupported HW features by Xenomai ?).

We are trying to install Xenomai version 2.6.3 on a HP Z840 workstation Red
Hat system 7.2.
The Workstation has  a double 12 cores CPU Intel Xeon E5-2690v3 on it.

We follow the installation guide and the troubleshooting but the latency is
still very high with some high jumps.
We tried to deal with the different options described in the guide

CONFIG_CPU_FREQ, CONFIG_CPU_IDLE, CONFIG_CONTEXT_TRACKING_FORCE
XENO_OPT_STATS  NO_HZ_FULL_ALL  BSD_PROCESS_ACCT  but none has impacted the
system, only marginal improvements.

We also tried to modify the  SMI detection parameters adding the following
string to kernel command line
xeno_hal.smi = 1
but without any effect.
Note: to notice that xenomai does not recognize the ethernet and we needed
to install again the ethernet card driver.  We don't know if this has some
impact on the system. We also noticed some freeze when recovering from the
sleep mode implying to restart the machine.

Would you have any idea how we can proceed to isolate the issue?

Thanks for the support

Regards


Michele

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Henning Schild]

Hello Michele,

you seem to be having multiple, possibly unrelated, issues. Some of them
seem related to the kernel you are using. Please provide the kernel
version and ipipe version you are talking about.
For the high latency cases you should provide an event-trace.

Henning

On Mon, 7 Mar 2016 11:33:31 +0100
Michele Belotti <miki.belotti@gmail.com> wrote:

> Hello everybody,
> We recently migrated my project on a new and more powerful
> workstation but I can obtain the previous performance.
> 
> We observed by running the standard Xenomai tools that there are very
> high latencies, hinting for an issue in the kernel configuration (or
> maybe unsupported HW features by Xenomai ?).
> 
> We are trying to install Xenomai version 2.6.3 on a HP Z840
> workstation Red Hat system 7.2.
> The Workstation has  a double 12 cores CPU Intel Xeon E5-2690v3 on it.
> 
> We follow the installation guide and the troubleshooting but the
> latency is still very high with some high jumps.
> We tried to deal with the different options described in the guide
> 
> CONFIG_CPU_FREQ, CONFIG_CPU_IDLE, CONFIG_CONTEXT_TRACKING_FORCE
> XENO_OPT_STATS  NO_HZ_FULL_ALL  BSD_PROCESS_ACCT  but none has
> impacted the system, only marginal improvements.
> 
> We also tried to modify the  SMI detection parameters adding the
> following string to kernel command line
> xeno_hal.smi = 1
> but without any effect.
> Note: to notice that xenomai does not recognize the ethernet and we
> needed to install again the ethernet card driver.  We don't know if
> this has some impact on the system. We also noticed some freeze when
> recovering from the sleep mode implying to restart the machine.
> 
> Would you have any idea how we can proceed to isolate the issue?
> 
> Thanks for the support
> 
> Regards
> 
> 
> Michele
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> https://xenomai.org/mailman/listinfo/xenomai

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Gilles Chanteperdrix]

On Mon, Mar 07, 2016 at 11:33:31AM +0100, Michele Belotti wrote:
> Hello everybody,
> We recently migrated my project on a new and more powerful workstation but
> I can obtain the previous performance.

You mean you can NOT.

> 
> We observed by running the standard Xenomai tools that there are very high
> latencies, hinting for an issue in the kernel configuration (or maybe
> unsupported HW features by Xenomai ?).

How high?

> 
> We are trying to install Xenomai version 2.6.3 on a HP Z840 workstation Red
> Hat system 7.2.
> The Workstation has  a double 12 cores CPU Intel Xeon E5-2690v3 on
> it.

Why installing Xenomai 2.6.3 ? It is not even the latest release in
the 2.6 branch.

> 
> We follow the installation guide and the troubleshooting but the latency is
> still very high with some high jumps.
> We tried to deal with the different options described in the guide
> 
> CONFIG_CPU_FREQ, CONFIG_CPU_IDLE, CONFIG_CONTEXT_TRACKING_FORCE
> XENO_OPT_STATS  NO_HZ_FULL_ALL  BSD_PROCESS_ACCT  but none has impacted the
> system, only marginal improvements.

What about CONFIG_ACPI_CPUFREQ?

> 
> We also tried to modify the  SMI detection parameters adding the following
> string to kernel command line
> xeno_hal.smi = 1
> but without any effect.

I am not sure 2.6.3 already had the kernel parameters, you may have
to configure the kernel to enable the SMI workaround.
In any case, using the module parameter, if this works, should
trigger some messages in the boot logs, as explained in the
troubleshooting guide. If you do not see the messages, you are doing
it wrong.

Regards.

-- 
					    Gilles.
https://click-hack.org

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Philippe Gerum]

On 03/07/2016 11:33 AM, Michele Belotti wrote:
> Hello everybody,
> We recently migrated my project on a new and more powerful workstation but
> I can obtain the previous performance.
> 
> We observed by running the standard Xenomai tools that there are very high
> latencies, hinting for an issue in the kernel configuration (or maybe

What does "high" mean? The output of a latency test showing the peak
would help.

> unsupported HW features by Xenomai ?).
> 
> We are trying to install Xenomai version 2.6.3 on a HP Z840 workstation Red
> Hat system 7.2.

2.6.3 is an outdated release of a Xenomai series which is EOL. Any
reason to use a totally unmaintained version?

Also, Xenomai releases are validated on mainline kernels. You are
basically on your own when running it over vendor kernels.

> The Workstation has  a double 12 cores CPU Intel Xeon E5-2690v3 on it.
>

- SMI are always a problem, affecting many x86 workstations and laptops
- Hyperthreading is always a problem
- Power management should be carefully audited

Please note that running Xenomai in dual kernel mode over so many cores
won't fly. You will likely have to restrict the number of cores usable
in real-time operations to get better performances at some point.

> We follow the installation guide and the troubleshooting but the latency is
> still very high with some high jumps.
> We tried to deal with the different options described in the guide
> 
> CONFIG_CPU_FREQ, CONFIG_CPU_IDLE, CONFIG_CONTEXT_TRACKING_FORCE
> XENO_OPT_STATS  NO_HZ_FULL_ALL  BSD_PROCESS_ACCT  but none has impacted the
> system, only marginal improvements.

Which guide mentions these ones: NO_HZ_FULL_ALL  BSD_PROCESS_ACCT?

> 
> We also tried to modify the  SMI detection parameters adding the following
> string to kernel command line
> xeno_hal.smi = 1
> but without any effect.

.smi = 1 just tells Xenomai to try enabling the work around. A message
in the kernel log should tell you whether the work around was enabled
successfully. I suspect it was not for various reasons.

Other ways to detect SMIs available on the net:
- the hwlat_detector module and script.
- reading MSR 0x34 on each CPU, using https://01.org/msr-tools

Check your BIOS:
- find out whether digital thermal sensors are present. If they are, you
may want to talk to your hw supplier about the potential implication of
DTS in SMI events, and see what might be done for fixing their BIOS in
case they are involved.
- disable any PS/2 emulation for mouse/kbd.

> Note: to notice that xenomai does not recognize the ethernet and we needed
> to install again the ethernet card driver. 

What do you mean by "installing"?

 We don't know if this has some
> impact on the system. We also noticed some freeze when recovering from the
> sleep mode implying to restart the machine.
> 

There is no support for this, neither the interrupt pipeline or Xenomai
care for it in any way.

> Would you have any idea how we can proceed to isolate the issue?
> 

A lot of information is missing. Following those guidelines may help you
in getting some answers:

http://xenomai.org/asking-for-help/

-- 
Philippe.

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Gilles Chanteperdrix]

On Mon, Mar 07, 2016 at 12:37:08PM +0100, Gilles Chanteperdrix wrote:
> > 
> > We follow the installation guide and the troubleshooting but the latency is
> > still very high with some high jumps.
> > We tried to deal with the different options described in the guide
> > 
> > CONFIG_CPU_FREQ, CONFIG_CPU_IDLE, CONFIG_CONTEXT_TRACKING_FORCE
> > XENO_OPT_STATS  NO_HZ_FULL_ALL  BSD_PROCESS_ACCT  but none has impacted the
> > system, only marginal improvements.
> 
> What about CONFIG_ACPI_CPUFREQ?

Sorry, CONFIG_ACPI_PROCESSOR.

-- 
					    Gilles.
https://click-hack.org

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Michele Belotti]

Hello everybody, many thanks for the prompt support.
I have tested yesterday the latest version of 2.6 branch but it does not
help.

The kernel I'm using is the v3.10.32 and I try ipipe 4 and 7 without any
improvement.
The latency is around 100 ns and always start with a max value of 30 and it
degenerates during time.


The worst case trace is hereafter obtaind with latency -f

I-pipe worst-case tracing service on 3.10.32_xenomai-2.6_20160224_1/ipipe
release #4
-------------------------------------------------------------
CPU: 0, Begin: 357409893008 cycles, Trace Points: 12 (-10/+1), Length:
31523 us
Calibrated minimum trace-point overhead: 0.078 us

 +----- Hard IRQs ('|': locked)
 |+-- Xenomai
 ||+- Linux ('*': domain stalled, '+': current, '#': current+stalled)
 |||                      +---------- Delay flag ('+': > 1 us, '!': > 10 us)
 |||                      |        +- NMI noise ('N')
 |||                      |        |
          Type    User Val.   Time    Delay  Function (Parent)
 |   #begin   0x80000000  -143    0.123  ipipe_unstall_root+0x1c
(_raw_spin_unlock_irq+0x11)
 |   #func                -143    0.185  ipipe_root_only+0x0
(ipipe_unstall_root+0x21)
 |   +end     0x80000000  -143    0.114  ipipe_trace_end+0x19
(ipipe_unstall_root+0x59)
     +func                -143    0.123  sub_preempt_count+0x0
(_raw_spin_unlock_irq+0x1b)
     +func                -142    0.141  add_preempt_count+0x0
(cpu_stopper_thread+0x97)
     +func                -142    0.134  stop_machine_cpu_stop+0x0
(cpu_stopper_thread+0x9d)
 |   +begin   0x80000001  -142    0.160  debug_smp_processor_id+0x3f
(stop_machine_cpu_stop+0x1a)
 |   +end     0x80000001  -142  142.114  ipipe_trace_end+0x19
(debug_smp_processor_id+0x76)
     #func                   0    0.235  mtrr_rendezvous_handler+0x0
(stop_machine_cpu_stop+0xe6)
     #func                   0    0.174  generic_set_mtrr+0x0
(mtrr_rendezvous_handler+0x67)
>|   #begin   0x80000001     0    0.132  generic_set_mtrr+0x1af
(mtrr_rendezvous_handler+0x67)
:|   #func                   0    0.137  prepare_set+0x0
(generic_set_mtrr+0x80)
:|   #func                   0    0.131  _raw_spin_lock+0x0
(prepare_set+0x15)
:|   #func                   0! 30160.710  add_preempt_count+0x0
(_raw_spin_lock+0x17)
:|   #func               30161! 1072.522  mtrr_wrmsr+0x0 (prepare_set+0x7a)
:|   #func               31233!  77.451  mtrr_wrmsr+0x0
(generic_set_mtrr+0x149)
:|   #func               31311!  76.539  mtrr_wrmsr+0x0
(generic_set_mtrr+0x160)
:|   #func               31387!  78.262  post_set+0x0
(generic_set_mtrr+0x165)
:|   #func               31465!  55.673  mtrr_wrmsr+0x0 (post_set+0x25)
:|   #func               31521+   1.141  _raw_spin_unlock+0x0
(post_set+0x52)
:|   #func               31522    0.496  sub_preempt_count+0x0
(_raw_spin_unlock+0x16)
<|   #end     0x80000001 31523    0.829  ipipe_trace_end+0x19
(generic_set_mtrr+0x17a)
 |   #begin   0x000000ef 31524    0.000  apic_timer_interrupt+0x6d
(generic_set_mtrr+0xc2)


The dynamic parameters used are
BOOT_IMAGE=/boot/vmlinuz-3.10.32_xenomai-2.6_20160224_1
root=UUID=2e4bd84d-b2ce-4ac9-8b10-377b2fa26437 ro crashkernel=auto rhgb
quiet LANG=en_US.UTF-8 systemd.debug ro xeno_nucleus.xenomai_gid=1001


I also verify that the ACPI is disables and Hyperthreading is desactivated.
About the Smi workaround what you intend that some message are triggered?
Warning disappears and I can see that the message

Xenomai: SMI workaround failed!

is not present. I guess that it is not working. But what I need to do
in the kernel ?


Many thanks

Michele




>

Re: [Xenomai] Fwd: Latency test fails. Problem during installation

[Michele Belotti]

Hello Everybody,
I tried different option and I obtain some improvement switching off in the
bios the Hyperthreading, but I'm still far from the result. Latency is till
very high as you can see from the test.
I verify defintely that SMI workaround is not working   Partial
deactivation of smi sources is also not working.(xeno_hal.smi_mask=<enable
mask>). Actually it didn’t even recognize that it was tried but accepted
the command(e.g.  xeno_hal.smi_mask=0xFFFCFFFB ).


To resume my situation I collect more information


HP Z840 workstation

Chipset    : Intel C610/X99
CPU    : 2 x Intel(R) Xeon(R) CPU E5-2690 v3 12Core


Linux Kernel 3.10.32  Xenomai version 2.6.4 ipipe version 7


Linux distribution RHEL 7.1


*Message form BIOS*



























*[    6.461268] I-pipe: head domain Xenomai registered.[    6.462528]
Xenomai: hal/x86_64 started.[    6.462797] Xenomai: scheduling class idle
registered.[    6.462808] Xenomai: scheduling class rt registered.[
6.584832] Xenomai: real-time nucleus v2.6.4 (Jumpin' Out) loaded.[
6.584844] Xenomai: debug mode enabled.[    6.585368] Xenomai: disabling
automatic C1E state promotion on Intel processor[    6.585603] Xenomai:
SMI-enabled chipset found[    6.585629] Xenomai: SMI workaround failed![
6.587167] Xenomai: starting native API services.[    6.587179] Xenomai:
starting POSIX services.[    6.587294] Xenomai: starting RTDM services.[
6.461268] I-pipe: head domain Xenomai registered.[   31.679848] I-pipe:
spurious interrupt 32[   45.024846] I-pipe: spurious interrupt 32[
54.793524] I-pipe: spurious interrupt 32[   54.793544] I-pipe: spurious
interrupt 32[   55.050552] I-pipe: spurious interrupt 32[   55.050568]
I-pipe: spurious interrupt 32[   65.077412] I-pipe: spurious interrupt
32[   75.107794] I-pipe: spurious interrupt 32[   75.107813] I-pipe:
spurious interrupt 32[   85.128461] I-pipe: spurious interrupt 32[
95.160067] I-pipe: spurious interrupt 32[   95.160084] I-pipe: spurious
interrupt 32[  105.181079] I-pipe: spurious interrupt 32[  125.234585]
I-pipe: spurious interrupt 32*



   -
*Configuration of Xenomai *











*xeno-config --verbose        --version="2.6.4"        --cc="gcc"
--arch="x86"        --prefix="/usr/xenomai"
--xeno-cflags="-I/usr/xenomai/include -D_GNU_SOURCE -D_REENTRANT
-D__XENO__"        --xeno-ldflags="-L/usr/xenomai/lib -lxenomai -lpthread
-lrt "        --posix-cflags=""
--posix-ldflags="-Wl,@/usr/xenomai/lib/posix.wrappers -L/usr/xenomai/lib
-lpthread_rt -lxenomai -lpthread -lrt "
--library-dir="/usr/xenomai/lib"*



# Generated by configure.
# Compiler output produced by configure, useful for debugging
# configure, is in config.log if it exists.
configured by ./configure, generated by GNU Autoconf 2.69,
ac_configure_extra_args=
  ac_configure_extra_args="$ac_configure_extra_args --silent"
  set X /bin/sh './configure'  $ac_configure_extra_args --no-create
--no-recursion
    # on some systems where configure will not decide to define it.
    # Let's still pretend it is `configure' which instantiates (i.e., don't
    configure_input='Generated from '`
    `' by configure.'
      configure_input="$ac_file.  $configure_input"
    case $configure_input in #(
       ac_sed_conf_input=`$as_echo "$configure_input" |
    *) ac_sed_conf_input=$configure_input;;
s|@configure_input@|$ac_sed_conf_input|;t t
      $as_echo "/* $configure_input  */" \
    $as_echo "/* $configure_input  */" \
# Libtool was configured on host `(hostname || uname -n) 2>/dev/null | sed
1q`:



   - Dynamic information to the kernel

BOOT_IMAGE=/boot/vmlinuz-3.10.32_xenomai-2.6_20160224_1
root=UUID=2e4bd84d-b2ce-4ac9-8b10-377b2fa26437 ro crashkernel=auto rhgb
quiet LANG=en_US.UTF-8 systemd.debug ro xeno_nucleus.xenomai_gid=1001




Itrace Max

I-pipe worst-case tracing service on 3.10.32x20160309/ipipe release #7
-------------------------------------------------------------
CPU: 0, Begin: 43934326523000 cycles, Trace Points: 12 (-10/+1), Length:
37832 us
Calibrated minimum trace-point overhead: 0.078 us

 +----- Hard IRQs ('|': locked)
 |+-- Xenomai
 ||+- Linux ('*': domain stalled, '+': current, '#': current+stalled)
 |||              +---------- Delay flag ('+': > 1 us, '!': > 10 us)
 |||              |       +- NMI noise ('N')
 |||              |       |
      Type      User Val.   Time    Delay  Function (Parent)
     #func                -391      0.143  rcu_irq_exit+0x0 (irq_exit+0x8f)
 |   #begin   0x80000001  -391      0.137  debug_smp_processor_id+0x3f
(rcu_irq_exit+0x55)
 |   #end     0x80000001  -391      0.126  ipipe_trace_end+0x14
(debug_smp_processor_id+0x76)
     #func                -391      0.115  ipipe_restore_root+0x0
(rcu_irq_exit+0x8e)
     #func                -391      0.118  ipipe_root_only+0x0
(ipipe_restore_root+0x12)
 |   #begin   0x80000001  -391      0.155  ipipe_root_only+0x9c
(ipipe_restore_root+0x12)
 |   #end     0x80000001  -391      0.376  ipipe_trace_end+0x14
(ipipe_root_only+0x86)
 |   +end     0x000000ef  -390    389.590  ipipe_trace_end+0x14
(apic_timer_interrupt+0x8f)
     #func                  -1      0.580  mtrr_rendezvous_handler+0x0
(stop_machine_cpu_stop+0xe4)
     #func                   0      0.473  generic_set_mtrr+0x0
(mtrr_rendezvous_handler+0x58)
>|   #begin   0x80000001     0      0.168  generic_set_mtrr+0x1a0
(mtrr_rendezvous_handler+0x58)
:|   #func                   0      0.256  prepare_set+0x0
(generic_set_mtrr+0x80)
:|   #func                   0      0.121  _raw_spin_lock+0x0
(prepare_set+0x15)
:|   #func                   0! 36321.797  add_preempt_count+0x0
(_raw_spin_lock+0x17)
:|   #func               36322! 1263.460  mtrr_wrmsr+0x0 (prepare_set+0x7a)
:|   #func               37585!  66.500  mtrr_wrmsr+0x0
(generic_set_mtrr+0x142)
:|   #func               37652!  65.266  mtrr_wrmsr+0x0
(generic_set_mtrr+0x159)
:|   #func               37717!  65.372  post_set+0x0
(generic_set_mtrr+0x15e)
:|   #func               37782!  47.720  mtrr_wrmsr+0x0 (post_set+0x25)
:|   #func               37830      0.951  _raw_spin_unlock+0x0
(post_set+0x52)
:|   #func               37831      0.464  sub_preempt_count+0x0
(_raw_spin_unlock+0x16)
<|   #end     0x80000001 37832      1.318  ipipe_trace_end+0x14
(generic_set_mtrr+0x173)
 |   #begin   0x000000ef 37833      0.000  apic_timer_interrupt+0x6d
(generic_set_mtrr+0xc2)


I also verified the other suggested parameters but they don't have any
effects. Could you please hint me on how I can activated the SMI
workaround?


I don't know if it helps but  UEFI is deactivated for other reason and were
running on legacy bios.


Thanks a lot for the precious help  and please me indicate if you need more
information.







Michele


2016-03-08 9:50 GMT+01:00 Michele Belotti <miki.belotti@gmail.com>:

> Hello everybody, many thanks for the prompt support.
> I have tested yesterday the latest version of 2.6 branch but it does not
> help.
>
> The kernel I'm using is the v3.10.32 and I try ipipe 4 and 7 without any
> improvement.
> The latency is around 100 ns and always start with a max value of 30 and
> it degenerates during time.
>
>
> The worst case trace is hereafter obtaind with latency -f
>
> I-pipe worst-case tracing service on 3.10.32_xenomai-2.6_20160224_1/ipipe
> release #4
> -------------------------------------------------------------
> CPU: 0, Begin: 357409893008 cycles, Trace Points: 12 (-10/+1), Length:
> 31523 us
> Calibrated minimum trace-point overhead: 0.078 us
>
>  +----- Hard IRQs ('|': locked)
>  |+-- Xenomai
>  ||+- Linux ('*': domain stalled, '+': current, '#': current+stalled)
>  |||                      +---------- Delay flag ('+': > 1 us, '!': > 10
> us)
>  |||                      |        +- NMI noise ('N')
>  |||                      |        |
>           Type    User Val.   Time    Delay  Function (Parent)
>  |   #begin   0x80000000  -143    0.123  ipipe_unstall_root+0x1c
> (_raw_spin_unlock_irq+0x11)
>  |   #func                -143    0.185  ipipe_root_only+0x0
> (ipipe_unstall_root+0x21)
>  |   +end     0x80000000  -143    0.114  ipipe_trace_end+0x19
> (ipipe_unstall_root+0x59)
>      +func                -143    0.123  sub_preempt_count+0x0
> (_raw_spin_unlock_irq+0x1b)
>      +func                -142    0.141  add_preempt_count+0x0
> (cpu_stopper_thread+0x97)
>      +func                -142    0.134  stop_machine_cpu_stop+0x0
> (cpu_stopper_thread+0x9d)
>  |   +begin   0x80000001  -142    0.160  debug_smp_processor_id+0x3f
> (stop_machine_cpu_stop+0x1a)
>  |   +end     0x80000001  -142  142.114  ipipe_trace_end+0x19
> (debug_smp_processor_id+0x76)
>      #func                   0    0.235  mtrr_rendezvous_handler+0x0
> (stop_machine_cpu_stop+0xe6)
>      #func                   0    0.174  generic_set_mtrr+0x0
> (mtrr_rendezvous_handler+0x67)
> >|   #begin   0x80000001     0    0.132  generic_set_mtrr+0x1af
> (mtrr_rendezvous_handler+0x67)
> :|   #func                   0    0.137  prepare_set+0x0
> (generic_set_mtrr+0x80)
> :|   #func                   0    0.131  _raw_spin_lock+0x0
> (prepare_set+0x15)
> :|   #func                   0! 30160.710  add_preempt_count+0x0
> (_raw_spin_lock+0x17)
> :|   #func               30161! 1072.522  mtrr_wrmsr+0x0 (prepare_set+0x7a)
> :|   #func               31233!  77.451  mtrr_wrmsr+0x0
> (generic_set_mtrr+0x149)
> :|   #func               31311!  76.539  mtrr_wrmsr+0x0
> (generic_set_mtrr+0x160)
> :|   #func               31387!  78.262  post_set+0x0
> (generic_set_mtrr+0x165)
> :|   #func               31465!  55.673  mtrr_wrmsr+0x0 (post_set+0x25)
> :|   #func               31521+   1.141  _raw_spin_unlock+0x0
> (post_set+0x52)
> :|   #func               31522    0.496  sub_preempt_count+0x0
> (_raw_spin_unlock+0x16)
> <|   #end     0x80000001 31523    0.829  ipipe_trace_end+0x19
> (generic_set_mtrr+0x17a)
>  |   #begin   0x000000ef 31524    0.000  apic_timer_interrupt+0x6d
> (generic_set_mtrr+0xc2)
>
>
> The dynamic parameters used are
> BOOT_IMAGE=/boot/vmlinuz-3.10.32_xenomai-2.6_20160224_1
> root=UUID=2e4bd84d-b2ce-4ac9-8b10-377b2fa26437 ro crashkernel=auto rhgb
> quiet LANG=en_US.UTF-8 systemd.debug ro xeno_nucleus.xenomai_gid=1001
>
>
> I also verify that the ACPI is disables and Hyperthreading is
> desactivated.
> About the Smi workaround what you intend that some message are triggered?
>   Warning disappears and I can see that the message
>
> Xenomai: SMI workaround failed!
>
> is not present. I guess that it is not working. But what I need to do in the kernel ?
>
>
> Many thanks
>
> Michele
>
>
>
>
>>
>