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authorJoseph Qi <joseph.qi@linux.alibaba.com>2021-02-23 04:55:28 +0300
committerJens Axboe <axboe@kernel.dk>2021-03-02 21:25:38 +0300
commit4168a8d27ed3a00f160e7f885c956f060d2a0741 (patch)
tree8189c7bea8cf69b4f8d8c155cc446691e01bb84e
parente4ef09e512940846fad77b1934065c166870b85a (diff)
downloadlinux-4168a8d27ed3a00f160e7f885c956f060d2a0741.tar.xz
block/bfq: update comments and default value in docs for fifo_expire
Correct the comments since bfq_fifo_expire[0] is for async request, while bfq_fifo_expire[1] is for sync request. Also update docs, according the source code, the default fifo_expire_async is 250ms, and fifo_expire_sync is 125ms. Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com> Acked-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--Documentation/block/bfq-iosched.rst4
-rw-r--r--block/bfq-iosched.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/block/bfq-iosched.rst b/Documentation/block/bfq-iosched.rst
index 19d4d1570cee..66c5a4e54130 100644
--- a/Documentation/block/bfq-iosched.rst
+++ b/Documentation/block/bfq-iosched.rst
@@ -430,13 +430,13 @@ fifo_expire_async
-----------------
This parameter is used to set the timeout of asynchronous requests. Default
-value of this is 248ms.
+value of this is 250ms.
fifo_expire_sync
----------------
This parameter is used to set the timeout of synchronous requests. Default
-value of this is 124ms. In case to favor synchronous requests over asynchronous
+value of this is 125ms. In case to favor synchronous requests over asynchronous
one, this value should be decreased relative to fifo_expire_async.
low_latency
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index ec482e6641ff..95586137194e 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -162,7 +162,7 @@ BFQ_BFQQ_FNS(split_coop);
BFQ_BFQQ_FNS(softrt_update);
#undef BFQ_BFQQ_FNS \
-/* Expiration time of sync (0) and async (1) requests, in ns. */
+/* Expiration time of async (0) and sync (1) requests, in ns. */
static const u64 bfq_fifo_expire[2] = { NSEC_PER_SEC / 4, NSEC_PER_SEC / 8 };
/* Maximum backwards seek (magic number lifted from CFQ), in KiB. */