[vbox-dev] [PATCH] open virtual disk file with O_DIRECT

[Howard Su]

I am not sure how big diff this change will bring in. But I think this
is worth trying. I enable this unconditional because i believe the
most write for disk file doesn't need cache in host (guest already
handle it.)

Index: VD.cpp
===================================================================
--- VD.cpp      (revision 35998)
+++ VD.cpp      (working copy)
@@ -2333,7 +2333,7 @@
     pStorage->pfnCompleted = pfnCompleted;

     /* Open the file. */
-    int rc = RTFileOpen(&pStorage->File, pszLocation, fOpen);
+    int rc = RTFileOpen(&pStorage->File, pszLocation, fOpen |
RTFILE_O_NO_CACHE);
     if (RT_SUCCESS(rc))
     {
         *ppStorage = pStorage;


-- 
-Howard