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Re: Boot time and 3 sec in warning_print
- To: Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 15 Feb 2021 15:00:42 +0000
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jürgen Groß <jgross@xxxxxxxx>, Anders Törnqvist <anders.tornqvist@xxxxxxxxx>
- Delivery-date: Mon, 15 Feb 2021 15:01:17 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15/02/2021 10:41, Jan Beulich wrote:
> On 15.02.2021 11:35, Julien Grall wrote:
>> On 15/02/2021 08:38, Jan Beulich wrote:
>>> On 15.02.2021 09:13, Jürgen Groß wrote:
>> What was just an "annoyance" for boot can now completely wreck your
>> guests and system (not many software can tolerate large downtime).
>>
>> So I think we either want to drop the 3s pause completely or allow the
>> user to decide whether he/she cares about it via a command line option.
>>
>> I am leaning towards the former at the moment.
> I'm afraid I'm -2 towards complete removal. I'm at least -1 towards
> shortening of the pause, as already indicated.
A 3s delay on boot doesn't even cause most people to notice. The
infrastructure has failed at its intended purpose.
Therefore, we should consider now to replace this largely-failed
experiment with something better.
Personally, I think ARM is abusing this in the first place. Adding a 3
second delay for someone who's explicitly chosen hmp_unsafe is petty.
So is adding a 3 second delay for anyone who's explicitly chosen a
non-default configuration. In retrospect, I think the delay for hvm_fep
is also wrong, especially as we also have a taint for it.
The *only* way to make users deal with the warnings is to surface them
very obviously in the UI they use to interact with their Xen system.
That is XenCenter/XenOrchestra/virt-manager/etc, and possibly the SSH
MOTD - not a logfile that approximately noone reads.
To make this happen, warnings need to be available somewhere which isn't
the dmesg ring. hypfs would be the obvious candidate at the moment.
~Andrew
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