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Re: [Xen-users] Xen boot time optimization

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From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>

Date: Thu, 5 Mar 2020 17:17:11 +0000

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Cc: nd <nd@xxxxxxx>, Subhasree P V <subhasree.pv@xxxxxxxxxxxxxxxxxxx>

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Thread-topic: [Xen-users] Xen boot time optimization

Hi,

On 4 Mar 2020, at 10:40, Subhasree P V <subhasree.pv@xxxxxxxxxxxxxxxxxxx> wrote:

Hi,

I have been working with using XEN on ODROID-XU4 board.I would like to optimize the boot time of XEN to 3s. Currently it is taking about 5s to boot.I have disabled the prints.There is about 4s delay before kernel load.

Below is the log before disabling prints.

[2020-02-13 12:53:18.791] (XEN) Brought up 8 CPUs
[2020-02-13 12:53:18.791] (XEN) P2M: 40-bit IPA
[2020-02-13 12:53:18.791] (XEN) P2M: 3 levels with order-1 root, VTCR 0x80003558
[2020-02-13 12:53:18.797] (XEN) I/O virtualisation disabled
[2020-02-13 12:53:18.802] (XEN) *** LOADING DOMAIN 0 ***
[2020-02-13 12:53:18.802] (XEN) Loading kernel from boot module @ 0000000060000000
[2020-02-13 12:53:18.808] (XEN) Allocating 1:1 mappings totalling 1024MB for dom0:
[2020-02-13 12:53:19.578] (XEN) BANK[0] 0x00000070000000-0x000000b0000000 (1024MB)
[2020-02-13 12:53:19.578] (XEN) Grant table range: 0x000000be800000-0x000000be861000
[2020-02-13 12:53:19.624] (XEN) Loading zImage from 0000000060000000 to 0000000077c00000-0000000077f08f60
[2020-02-13 12:53:19.649] (XEN) Allocating PPI 16 for event channel interrupt
[2020-02-13 12:53:19.649] (XEN) Loading dom0 DTB to 0x0000000078000000-0x000000007800c2f0
[2020-02-13 12:53:19.654] (XEN) Scrubbing Free RAM on 1 nodes using 8 CPUs

You probably want to disable scrubbing memory to speed up your boot (add bootscrub=no to your command line).

Regards

Bertrand

[2020-02-13 12:53:19.915] (XEN) ..done.
[2020-02-13 12:53:20.168] (XEN) Initial low memory virq threshold set at 0x4000 pages.
[2020-02-13 12:53:20.174] (XEN) Std. Loglevel: All
[2020-02-13 12:53:20.174] (XEN) Guest Loglevel: All
[2020-02-13 12:53:20.174] (XEN) Freed 264kB init memory.
[2020-02-13 12:53:24.274] [ 0.000000] [c0] Booting Linux on physical CPU 0x0

I'm getting a delay after Freed 264kB init memory.I'm not able to figure out the reason for delay.Is there any way to reduce the delay?Please help me to solve this.

Thank you.

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