Changeset 52911 in vbox for trunk/src/VBox

Timestamp:

Oct 1, 2014 9:45:51 AM (10 years ago)

Author:

vboxsync

Message:

HostDrivers/Support: Disable interrupts per-iteration while measuring TSC deltas, real problem on Windows.

File:

• trunk/src/VBox/HostDrivers/Support/SUPDrv.c (modified) (2 diffs)

trunk/src/VBox/HostDrivers/Support/SUPDrv.c

@@ -6166 +6166 @@
         unsigned    i;
         uint64_t    uMinCmpReadTime = UINT64_MAX;
-        RTCCUINTREG uFlags = ASMIntDisableFlags();          /* Disable interrupts for the duration of a try. */
         for (i = 0; i < GIP_TSC_DELTA_LOOPS; i++)
         {
-            ASMCompilerBarrier();
+            RTCCUINTREG uFlags = ASMIntDisableFlags();   /* Disable interrupts per-iteration, see @bugref{6710} comment #38. */
             if (idCpu == idMaster)
             {
@@ -6254 +6253 @@
                     ASMNopPause();
             }
-        }
-        ASMSetFlags(uFlags);
+
+            ASMSetFlags(uFlags);
+        }
 
         if (pGipCpuWorker->i64TSCDelta != INT64_MAX)