linux-kernel - [PATCH] bfq: default slice

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Date:   Mon,  7 Mar 2022 16:02:53 -0800
From:   Khazhismel Kumykov <khazhy@...gle.com>
To:     Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Khazhismel Kumykov <khazhy@...gle.com>
Subject: [PATCH] bfq: default slice_idle to 0 for SSD

This improves performance on SSDs dramatically, and was default for CFQ

Signed-off-by: Khazhismel Kumykov <khazhy@...gle.com>
---
 block/bfq-iosched.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 36a66e97e3c2..f3196036940c 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -7105,7 +7105,8 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_type *e)
 	bfqd->bfq_fifo_expire[1] = bfq_fifo_expire[1];
 	bfqd->bfq_back_max = bfq_back_max;
 	bfqd->bfq_back_penalty = bfq_back_penalty;
-	bfqd->bfq_slice_idle = bfq_slice_idle;
+	/* Default to no idling for SSDs */
+	bfqd->bfq_slice_idle = blk_queue_nonrot(q) ? 0 : bfq_slice_idle;
 	bfqd->bfq_timeout = bfq_timeout;
 
 	bfqd->bfq_large_burst_thresh = 8;
-- 
2.35.1.616.g0bdcbb4464-goog