On 27.07.20 08:25, Peng Fan wrote:
Hi Jan
...
I tested the SDEI on i.MX8MM, it shows the jitter became smaller.
Without SDEI, the gic-demo jitter is 999ns+
With SDEI, the gic-demo jitter is 124ns~246ns.
Indeed no more vmexits.
But the max jitter, some times SDEI bigger only when program start up, mostly
because of CACHE WARM UP I think.
That is one source. If you add a warm-up period, they can be mitigated,
though.
The other source might be last-level cache sharing. If there are
cache-miss counters, maybe you can check if those increase along the peaks.
Will you move SDEI support to jailhouse mainline?
Once the to-dos are addressed. Any contributions?
BTW, did you have to patch ATF for your experiment? Will you upstream
that patch?
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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