Changeset 2828 in vbox

Timestamp:

May 23, 2007 4:20:24 PM (18 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

21443

Message:

If the TSC isn't fixed, spin instead of sleeping when reading out the the TSC frequency.

File:

• trunk/src/VBox/VMM/TM.cpp (modified) (1 diff)

trunk/src/VBox/VMM/TM.cpp

@@ -570 +570 @@
         else
         {
-            RTThreadSleep(32);              /* To preserve old behaviour and to get a good CpuHz at startup. */
+            if (tmR3HasFixedTSC())
+                /* Sleep a bit to get a more reliable CpuHz value. */
+                RTThreadSleep(32);              
+            else
+            {
+                /* Spin for 40ms to try push up the CPU frequency and get a more reliable CpuHz value. */
+                const uint64_t u64 = RTTimeMilliTS();
+                while ((RTTimeMilliTS() - u64) < 40 /*ms*/)
+                    /* nothing */;
+            }
+
             pGip = g_pSUPGlobalInfoPage;
             if (    pGip