Author: imp
Date: Wed Sep 20 21:42:25 2017
New Revision: 323834
URL: https://svnweb.freebsd.org/changeset/base/323834
Log:
Fix queue depth for nda.
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.
Modified:
head/sys/dev/nvme/nvme_ctrlr.c
Modified: head/sys/dev/nvme/nvme_ctrlr.c
==============================================================================
--- head/sys/dev/nvme/nvme_ctrlr.c Wed Sep 20 21:29:54 2017
(r323833)
+++ head/sys/dev/nvme/nvme_ctrlr.c Wed Sep 20 21:42:25 2017
(r323834)
@@ -151,7 +151,7 @@ nvme_ctrlr_construct_io_qpairs(struct nvme_controller
* 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
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