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Yield while spinning on APs and avoid announcing all CPUs unless bootverbose

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is set. These improve startup performance on massively multithreaded systems
with 8-way SMT and dozens to hundreds of CPUs.

MFC after:	3 weeks
This commit is contained in:
Nathan Whitehorn 2017-11-25 22:01:55 +00:00
parent de2dd83fb9
commit f04a8fd6a9
1 changed files with 5 additions and 1 deletions
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6
sys/powerpc/powerpc/mp_machdep.c
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@ -78,7 +78,8 @@ machdep_ap_bootstrap(void)
__asm __volatile("msync; isync");
while (ap_letgo == 0)
;
__asm __volatile("or 27,27,27");
__asm __volatile("or 6,6,6");
/* Initialize DEC and TB, sync with the BSP values */
platform_smp_timebase_sync(ap_timebase, 1);
@ -177,6 +178,9 @@ cpu_mp_announce(void)
struct pcpu *pc;
int i;
if (!bootverbose)
return;
CPU_FOREACH(i) {
pc = pcpu_find(i);
if (pc == NULL)