repository: /home/avi/kvm
branch: master
commit 65e61cf88af1ae527b2fd610e1ad8955ad7fce13
Author: Uri Lublin <[EMAIL PROTECTED]>
Date: Sun Aug 26 12:41:40 2007 +0300
migration: make bandwidth limitation adaptive
When there seems to be no-progress (pages are getting dirty faster
than pages are getting transferred), try harder by increasing (double)
the bandwidth limitation.
diff --git a/qemu/migration.c b/qemu/migration.c
index cb866d7..f6e2754 100644
--- a/qemu/migration.c
+++ b/qemu/migration.c
@@ -32,7 +32,7 @@
#define MIN_FINALIZE_SIZE (200 << 10)
#define MAX_ITERATIONS 30
-#define MAX_RAPID_WRITES 2
+#define MAX_RAPID_WRITES 5
typedef struct MigrationState
{
@@ -349,6 +349,8 @@ static void migrate_write(void *opaque)
if ((s->iteration) && (s->last_updated_pages <= s->updated_pages)) {
s->rapid_writes++; /* "dirt-speed" is faster than transfer speed */
+ if (max_throttle < (1 << 30))
+ max_throttle *= 2; /* try harder */
}
s->last_updated_pages = s->updated_pages;
s->updated_pages = 0;
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