diff options
| -rw-r--r-- | util/throttle.c | 11 |
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; |