[Xen-users] XEN boot time optimization

[Subhasree P V <subhasree.pv@xxxxxxxxxxxxxxxxxxx>]

Hi,

I'm currently working on boot time optimization of xen in ODROID XU4 Board.I have disabled the boot scrubbing and disabled the prints. My current log for xen is like below.

[2020-03-10 14:42:21.018] Starting kernel ...
[2020-03-10 14:42:21.019]
[2020-03-10 14:42:21.043] (XEN) Checking for initrd in /chosen
[2020-03-10 14:42:21.561]  Xen 4.6.0
[2020-03-10 14:42:21.574] (XEN) Brought up 8 CPUs
[2020-03-10 14:42:21.574] (XEN) *** LOADING DOMAIN 0 ***
[2020-03-10 14:42:22.870] (XEN) Freed 264kB init memory.
[2020-03-10 14:42:25.587] [    0.000000] [c0] Booting Linux on physical CPU 0x0

I can see a delay of about 2.720s after Freed 264kB init memory and before the dom0 kernel load.please see the below log

[2020-03-10 14:42:22.870] (XEN) Freed 264kB init memory.
[2020-03-10 14:42:25.587] [    0.000000] [c0] Booting Linux on physical CPU 0x0

I'm not able to figure out where the delay is actually coming from.Is it the time taken for the processing of interrupts or for the kernel initialization?Is there any way to reduce that delay?somebody please help me to solve this.

Thanks & Regards,

subhasree

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