Re: [Xenomai-help] Running xeno-test

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Martin Shepherd wrote:
> On Sat, 11 Apr 2009, Gilles Chanteperdrix wrote:
>> We have just discovered that FPU handling on x86 had a few bugs, one of
>> them involving CPUs without fxsr (check /proc/cpuinfo).
> 
> The AMD Athlon that I am using, does have fxsr, according to
> /proc/cpuinfo. Regardless, now that I have seen lockups during the
> latency tests as well, I don't think that the problem can be related
> to floating point. It looks more like an interrupt problem.

Ok. But the patch mentioned previously also fixes kernels using FPU in
kernel-space, which the Athlon does according to Konfig. So, please try
the FPU patch or select K6 instead of Athlon.

> 
> Xeno-test sporadically locks up the computer during both the latency
> tests and the switching tests. It just happens more often during the
> switching test. When the computer is in the locked-up state, the clock
> stops updating, any ssh sessions to the computer hang, and I can't
> either start a new ssh session, or ping the computer from an external
> computer. This persists indefinitely. However all that I have to do to
> unhang the computer, is move the mouse, or hit any keyboard key on the
> offending PC. Then xeno-test resumes, pings get through etc, until the
> next hang. Also, occasionally, moving the mouse or hitting any key
> when xeno-test is running, will cause xeno-test to freeze for a
> moment, and then report a multi-millisecond latency when I resume it
> by moving the mouse.
> 
> My guess is that when it hangs, it is waiting for a timer interrupt
> that for some reason never arives, and that moving the mouse or
> hitting a key on the keyboard generates an interrupt that wakes it
> up. Both the keyboard and mouse are PS/2 devices, which presumably go
> through the i8042 driver. The contents of /proc/interrupts, shown
> below, don't indicate anything attempting to share interrupts with
> this.
>  	    CPU0
>     0:    2545784    XT-PIC-XT        timer
>     1:       9149    XT-PIC-XT        i8042
>     2:          0    XT-PIC-XT        cascade
>     3:          3    XT-PIC-XT
>     4:          3    XT-PIC-XT
>     5:       2755    XT-PIC-XT        VIA686A
>     7:          1    XT-PIC-XT        parport0
>     8:          1    XT-PIC-XT        rtc0
>     9:          0    XT-PIC-XT        acpi, uhci_hcd:usb1, uhci_hcd:usb2
>    11:    8410900    XT-PIC-XT        eth0, radeon@domain.hid
>    12:      70922    XT-PIC-XT        i8042
>    14:     847875    XT-PIC-XT        pata_via
>    15:          0    XT-PIC-XT        pata_via
>   NMI:          0   Non-maskable interrupts
>   ERR:          0
> 
> Any ideas?

Could you tell us the versions of Linux and Xenomai you are using and
post your .config ?

-- 
					    Gilles.