1 files changed, 3 insertions, 8 deletions
diff --git a/util/throttle.c b/util/throttle.c
index b2a52b8b34..9a6bda813c 100644
--- a/util/throttle.c
+++ b/util/throttle.c
@@ -366,14 +366,9 @@ static void throttle_fix_bucket(LeakyBucket *bkt)
     /* zero bucket level */
     bkt->level = bkt->burst_level = 0;
 
-    /* The following is done to cope with the Linux CFQ block scheduler
-     * which regroup reads and writes by block of 100ms in the guest.
-     * When they are two process one making reads and one making writes cfq
-     * make a pattern looking like the following:
-     * WWWWWWWWWWWRRRRRRRRRRRRRRWWWWWWWWWWWWWwRRRRRRRRRRRRRRRRR
-     * Having a max burst value of 100ms of the average will help smooth the
-     * throttling
-     */
+    /* If bkt->max is 0 we still want to allow short bursts of I/O
+     * from the guest, otherwise every other request will be throttled
+     * and performance will suffer considerably. */
     min = bkt->avg / 10;
     if (bkt->avg && !bkt->max) {
         bkt->max = min;