From e459dd08f45d2aa68abb0c02f8ab045cf8a598b8 Mon Sep 17 00:00:00 2001 From: Corrado Zoccolo Date: Thu, 26 Nov 2009 10:02:57 +0100 Subject: cfq-iosched: fix ncq detection code CFQ's detection of queueing devices initially assumes a queuing device and detects if the queue depth reaches a certain threshold. However, it will reconsider this choice periodically. Unfortunately, if device is considered not queuing, CFQ will force a unit queue depth for some workloads, thus defeating the detection logic. This leads to poor performance on queuing hardware, since the idle window remains enabled. Given this premise, switching to hw_tag = 0 after we have proved at least once that the device is NCQ capable is not a good choice. The new detection code starts in an indeterminate state, in which CFQ behaves as if hw_tag = 1, and then, if for a long observation period we never saw large depth, we switch to hw_tag = 0, otherwise we stick to hw_tag = 1, without reconsidering it again. Signed-off-by: Corrado Zoccolo Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) (limited to 'block/cfq-iosched.c') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index c2ef5d17608c..47abd24617be 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -191,8 +191,14 @@ struct cfq_data { */ int rq_queued; int hw_tag; - int hw_tag_samples; - int rq_in_driver_peak; + /* + * hw_tag can be + * -1 => indeterminate, (cfq will behave as if NCQ is present, to allow better detection) + * 1 => NCQ is present (hw_tag_est_depth is the estimated max depth) + * 0 => no NCQ + */ + int hw_tag_est_depth; + unsigned int hw_tag_samples; /* * idle window management @@ -2518,8 +2524,11 @@ static void cfq_update_hw_tag(struct cfq_data *cfqd) { struct cfq_queue *cfqq = cfqd->active_queue; - if (rq_in_driver(cfqd) > cfqd->rq_in_driver_peak) - cfqd->rq_in_driver_peak = rq_in_driver(cfqd); + if (rq_in_driver(cfqd) > cfqd->hw_tag_est_depth) + cfqd->hw_tag_est_depth = rq_in_driver(cfqd); + + if (cfqd->hw_tag == 1) + return; if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && rq_in_driver(cfqd) <= CFQ_HW_QUEUE_MIN) @@ -2538,13 +2547,10 @@ static void cfq_update_hw_tag(struct cfq_data *cfqd) if (cfqd->hw_tag_samples++ < 50) return; - if (cfqd->rq_in_driver_peak >= CFQ_HW_QUEUE_MIN) + if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) cfqd->hw_tag = 1; else cfqd->hw_tag = 0; - - cfqd->hw_tag_samples = 0; - cfqd->rq_in_driver_peak = 0; } static void cfq_completed_request(struct request_queue *q, struct request *rq) @@ -2951,7 +2957,7 @@ static void *cfq_init_queue(struct request_queue *q) cfqd->cfq_slice_async_rq = cfq_slice_async_rq; cfqd->cfq_slice_idle = cfq_slice_idle; cfqd->cfq_latency = 1; - cfqd->hw_tag = 1; + cfqd->hw_tag = -1; cfqd->last_end_sync_rq = jiffies; return cfqd; } -- cgit v1.2.2