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Fix queue depth for nda.

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1/4 of the number of queues times queue entries is too limiting. It
works up to about 4k IOPS / 3.0GB/s for hardware that can do
4.4k/3.2GB/s with nvd. 3/4 works better, though it highlights issues
in the fairness of nda's choice of TRIM vs READ. That will be fixed
separately.
This commit is contained in:
Warner Losh 2017-09-20 21:42:25 +00:00
parent 2c62ba7377
commit 5fff95cc1d
1 changed files with 1 additions and 1 deletions
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2
sys/dev/nvme/nvme_ctrlr.c
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@ -151,7 +151,7 @@ nvme_ctrlr_construct_io_qpairs(struct nvme_controller *ctrlr)
* not a hard limit and will need to be revisitted when the upper layers
* of the storage system grows multi-queue support.
*/
ctrlr->max_hw_pend_io = num_trackers * ctrlr->num_io_queues / 4;
ctrlr->max_hw_pend_io = num_trackers * ctrlr->num_io_queues * 3 / 4;
/*
* This was calculated previously when setting up interrupts, but