VMMR3

Timestamp:

May 30, 2023 6:18:41 AM (20 months ago)

Author:

vboxsync

Message:

VMM/NEMR3Native-darwin-armv8: Lower the timespan when to start halting, bugref:10390

File:

trunk/src/VBox/VMM/VMMR3/NEMR3Native-darwin-armv8.cpp

-              r100001
+              r100003
                 uint64_t cNanoSecsVTimerToExpire = ASMMultU64ByU32DivByU32(cTicksVTimerToExpire, RT_NS_1SEC, (uint32_t)pVM->nem.s.u64CntFrqHz);
+                /* Our halt method doesn't work with sub millisecond granularity at the moment causing a huge slowdown. */
+                if (cNanoSecsVTimerToExpire < 20 * RT_NS_1MS)
+                /*
+                 * Our halt method doesn't work with sub millisecond granularity at the moment causing a huge slowdown
+                 * + scheduling overhead which would increase the wakeup latency.
+                 * So only halt when the threshold is exceeded (needs more experimentation but 5ms turned out to be a good compromise
+                 * between CPU load when the guest is idle and performance).
+                 */
+                if (cNanoSecsVTimerToExpire < 5 * RT_NS_1MS)
                     return VINF_SUCCESS;

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