rtems-record-lttng: Corrupted timestamps after translating to CTF

[Jan.Sommer at dlr.de]

> -----Original Message-----
> From: Sebastian Huber <sebastian.huber at embedded-brains.de>
> Sent: Friday, March 19, 2021 6:25 AM
> To: Sommer, Jan <Jan.Sommer at dlr.de>; users at rtems.org
> Subject: Re: rtems-record-lttng: Corrupted timestamps after translating to
> CTF
> 
> On 18/03/2021 23:06, Jan.Sommer at dlr.de wrote:
> 
> >>> The to_bt_scaler is quite a large value and I don't fully get what it scales.
> >> Does someone have some hints?
> >> It could be related to ring buffer overflows. Do you get
> >> RTEMS_RECORD_PER_CPU_OVERFLOW items? There could be also some
> bugs in
> >> record-client.c. More unit tests for it would be helpful.
> >>
> > I had some more time to look at this.
> > It turns out that the RTEMS_RECORD_UPTIME_* events are always
> assigned to cpu 0.
> > I checked the watchdog and indeed the _Record_Watchdog
> (https://git.rtems.org/rtems/tree/cpukit/libtrace/record/record-
> sysinit.c#n64) is executed twice, but always on cpu 0.
> >
> > I tested with the rv32imac bsp with 2 cores, each with its own
> RTEMS_SCHEDULER_PRIORITY_SMP and with the following defines:
> >
> > #define CONFIGURE_RECORD_PER_PROCESSOR_ITEMS 2048 #define
> > CONFIGURE_RECORD_EXTENSIONS_ENABLED
> > #define CONFIGURE_RECORD_FATAL_DUMP_BASE64_ZLIB
> >
> > Do I need to configure something else? I am not familiar with the watchdog
> part. The initialization looks good as far as I can tell.
> Ok, I thought you use the Zynq. In a production SMP system, the clock driver
> interrupt must fire on all processors used by the system. That the current
> RISC-V clock driver uses only the boot processor is a known limitation and
> you see this in the smpclock01 test failure. I would fix the clock driver and use
> an approach similar to the Arm Generic Timer clock driver.
> 

Thanks, I will have a look.
In the meantime, is there an ARM BSP which is supported by qemu with 8 or more cores?

Best regards,

    Jan

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