migration: add XFER_LIMIT_RATIO
The "magic" divisions by 10 are there because of the value of BUFFER_DELAY.
Introduce a constant to explain them better.
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Juan Quintela <[email protected]>
diff --git a/migration.c b/migration.c
index 2937c87..15f22ea 100644
--- a/migration.c
+++ b/migration.c
@@ -44,6 +44,11 @@
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
+/* Amount of time to allocate to each "chunk" of bandwidth-throttled
+ * data. */
+#define BUFFER_DELAY 100
+#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
+
/* Migration XBZRLE default cache size */
#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
@@ -743,9 +748,6 @@
return s->xfer_limit;
}
-/* 100ms xfer_limit is the limit that we should write each 100ms */
-#define BUFFER_DELAY 100
-
static void *buffered_file_thread(void *opaque)
{
QEMUFileBuffered *s = opaque;
@@ -808,7 +810,7 @@
s = g_malloc0(sizeof(*s));
s->migration_state = migration_state;
- s->xfer_limit = migration_state->bandwidth_limit / 10;
+ s->xfer_limit = s->migration_state->bandwidth_limit / XFER_LIMIT_RATIO;
s->migration_state->complete = false;
s->file = qemu_fopen_ops(s, &buffered_file_ops);
