12262 Suboptimal vmem hash table slows down boot

Review Request #2504 - Created Jan. 29, 2020 and submitted

Information
Marcel Telka
illumos-gate
master
12262
283c253...
Reviewers
general 
This change starts the periodic hash rescale for all vmem arenas before we load
protocol modules and drivers during boot.  Some drivers relies on heavy vmem
operations (e.g. i40e) and without the periodic vmem hash rescale their
performance could be really bad and the whole boot process would be very slow.
Without this change the boot process on affected machines was stuck for about
30 minutes in the i40e driver.  With the fix the delay is hardly noticeable.

I also confirmed that this change does not intruce any regression on tested
machines.
Gergő Mihály Doma
Marcel Telka
Review request changed

Status: Closed (submitted)

Change Summary:

commit 948761701ebc8a0cf820a973780b2fbb931c4390
Author:     Marcel Telka <marcel@telka.sk>
AuthorDate: Wed Jan 29 17:03:43 2020 +0100
Commit:     Dan McDonald <danmcd@joyent.com>
CommitDate: Wed Feb 5 10:41:03 2020 -0500

    12262 Suboptimal vmem hash table slows down boot
    Reviewed by: Stefan Behrens <sbehrens@giantdisaster.de>
    Reviewed by: Gergő Mihály Doma <domag02@gmail.com>
    Approved by: Dan McDonald <danmcd@joyent.com>

:100644 100644 aa58118e48 3579053899 M	usr/src/uts/common/os/main.c
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