Changeset 5244 in vbox for trunk/src/VBox/VMM

Timestamp:

Oct 11, 2007 4:33:17 PM (17 years ago)

Author:

vboxsync

Message:

Some more tuning wheels and nobs.

File:

• trunk/src/VBox/VMM/VMMR0/GVMMR0.cpp (modified) (5 diffs)

trunk/src/VBox/VMM/VMMR0/GVMMR0.cpp

@@ -108 +108 @@
     GVMHANDLE           aHandles[128];
 
-    /** The minimum sleep time, in nano seconds.
-     * @gcfgm   /GVMM/MinSleep      32-bit  0..100000000
-     */
-    uint32_t            nsMinSleep;
+    /** The number of VMs that means we no longer considers ourselves along on a CPU/Core.
+     * @gcfgm   /GVMM/cVMsMeansCompany 32-bit  0..UINT32_MAX
+     */
+    uint32_t            cVMsMeansCompany;
+    /** The minimum sleep time for when we're alone, in nano seconds.
+     * @gcfgm   /GVMM/MinSleepAlone     32-bit  0..100000000
+     */
+    uint32_t            nsMinSleepAlone;
+    /** The minimum sleep time for when we've got company, in nano seconds.
+     * @gcfgm   /GVMM/MinSleepCompany   32-bit  0..100000000
+     */
+    uint32_t            nsMinSleepCompany;
     /** The limit for the first round of early wakeups, given in nano seconds.
-     * @gcfgm   /GVMM/EarlyWakeUp1  32-bit  0..100000000
+     * @gcfgm   /GVMM/EarlyWakeUp1      32-bit  0..100000000
      */
     uint32_t            nsEarlyWakeUp1;
     /** The limit for the second round of early wakeups, given in nano seconds.
-     * @gcfgm   /GVMM/EarlyWakeUp2  32-bit  0..100000000
+     * @gcfgm   /GVMM/EarlyWakeUp2      32-bit  0..100000000
      */
     uint32_t            nsEarlyWakeUp2;
@@ -216 +224 @@
 
             /* The default configuration values. */
-            pGVMM->nsMinSleep     = 750000 /* ns (0.750 ms) */; /** @todo this should be adjusted to be 75% (or something) of the scheduler granularity... */
-            pGVMM->nsEarlyWakeUp1 =  25000 /* ns (0.025 ms) */;
-            pGVMM->nsEarlyWakeUp2 =  50000 /* ns (0.050 ms) */;
+            pGVMM->cVMsMeansCompany  = 1;                           /** @todo should be adjusted to relative to the cpu count or something... */
+            pGVMM->nsMinSleepAlone   = 750000 /* ns (0.750 ms) */;  /** @todo this should be adjusted to be 75% (or something) of the scheduler granularity... */
+            pGVMM->nsMinSleepCompany =  15000 /* ns (0.015 ms) */;
+            pGVMM->nsEarlyWakeUp1    =  25000 /* ns (0.025 ms) */;
+            pGVMM->nsEarlyWakeUp2    =  50000 /* ns (0.050 ms) */;
 
             g_pGVMM = pGVMM;
@@ -296 +306 @@
     int rc = VINF_SUCCESS;
     pszName += sizeof("/GVMM/") - 1;
-    if (!strcmp(pszName, "MinSleep"))
+    if (!strcmp(pszName, "cVMsMeansCompany"))
+    {
+        if (u64Value <= UINT32_MAX)
+            pGVMM->cVMsMeansCompany = u64Value;
+        else
+            rc = VERR_OUT_OF_RANGE;
+    }
+    else if (!strcmp(pszName, "MinSleepAlone"))
     {
         if (u64Value <= 100000000)
-            pGVMM->nsMinSleep = u64Value;
+            pGVMM->nsMinSleepAlone = u64Value;
+        else
+            rc = VERR_OUT_OF_RANGE;
+    }
+    else if (!strcmp(pszName, "MinSleepCompany"))
+    {
+        if (u64Value <= 100000000)
+            pGVMM->nsMinSleepCompany = u64Value;
         else
             rc = VERR_OUT_OF_RANGE;
@@ -350 +374 @@
     int rc = VINF_SUCCESS;
     pszName += sizeof("/GVMM/") - 1;
-    if (!strcmp(pszName, "MinSleep"))
-        *pu64Value = pGVMM->nsMinSleep;
+    if (!strcmp(pszName, "cVMsMeansCompany"))
+        *pu64Value = pGVMM->cVMsMeansCompany;
+    else if (!strcmp(pszName, "MinSleepAlone"))
+        *pu64Value = pGVMM->nsMinSleepAlone;
+    else if (!strcmp(pszName, "MinSleepCompany"))
+        *pu64Value = pGVMM->nsMinSleepCompany;
     else if (!strcmp(pszName, "EarlyWakeUp1"))
         *pu64Value = pGVMM->nsEarlyWakeUp1;
@@ -1348 +1376 @@
      */
     if (    u64Now < u64ExpireGipTime
-        &&  (   pGVMM->cVMs > 1
-             || (u64ExpireGipTime - u64Now >= pGVMM->nsMinSleep)))
+        &&  u64ExpireGipTime - u64Now > (pGVMM->cVMs > pGVMM->cVMsMeansCompany
+                                         ? pGVMM->nsMinSleepCompany
+                                         : pGVMM->nsMinSleepAlone))
     {
         pGVM->gvmm.s.StatsSched.cHaltBlocking++;