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Disable boot-time memory test on i386 be default.

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With the current 24G memory limit for GENERIC, the boot time test
causes quite visible delay, amplified by the default
debug.late_console = 0.

The comment text is copied from the same setting explanation for
amd64.

Suggested by:	bde
Discussed with:	emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	2 months
This commit is contained in:
kib 2019-02-01 21:09:36 +00:00
parent 9125922c5e
commit c0d866da71
1 changed files with 8 additions and 6 deletions
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14
sys/i386/i386/machdep.c
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@ -2005,13 +2005,15 @@ getmemsize(int first)
Maxmem = atop(physmap[physmap_idx + 1]);
/*
* By default enable the memory test on real hardware, and disable
* it if we appear to be running in a VM. This avoids touching all
* pages unnecessarily, which doesn't matter on real hardware but is
* bad for shared VM hosts. Use a general name so that
* one could eventually do more with the code than just disable it.
* The boot memory test is disabled by default, as it takes a
* significant amount of time on large-memory systems, and is
* unfriendly to virtual machines as it unnecessarily touches all
* pages.
*
* A general name is used as the code may be extended to support
* additional tests beyond the current "page present" test.
*/
memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1;
memtest = 0;
TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
if (atop(physmap[physmap_idx + 1]) != Maxmem &&