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| H A D | blk-merge.c | diff 668ffc03418bc779f699797c72ecf968cd6525a9 Mon Nov 19 19:52:37 CST 2018 Damien Le Moal <damien.lemoal@wdc.com> block: prevent merging of requests with different priorities
Growing in size a high priority request by merging it with a lower
priority BIO or request will increase the request execution time. This
is the opposite result of the desired effect of high I/O priorities,
namely getting low I/O latencies. Prevent merging of requests and BIOs
that have different I/O priorities to fix this.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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| H A D | blk-core.c | diff 668ffc03418bc779f699797c72ecf968cd6525a9 Mon Nov 19 19:52:37 CST 2018 Damien Le Moal <damien.lemoal@wdc.com> block: prevent merging of requests with different priorities
Growing in size a high priority request by merging it with a lower
priority BIO or request will increase the request execution time. This
is the opposite result of the desired effect of high I/O priorities,
namely getting low I/O latencies. Prevent merging of requests and BIOs
that have different I/O priorities to fix this.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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