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Increate HMB limit from 1% to 5%.

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SSD capacity in laptops is growing faster then RAM size, so my original
guess seems too low on second thought.  Hopefully nobody will build large
array of those crappy SSDs.

MFC after:	2 weeks
X-MFC-with:	356474
This commit is contained in:
Alexander Motin 2020-01-07 23:10:38 +00:00
parent 6f5bc35d94
commit 1c7dd40e58
1 changed files with 2 additions and 2 deletions
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4
sys/dev/nvme/nvme_ctrlr.c
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@ -881,8 +881,8 @@ nvme_ctrlr_hmb_alloc(struct nvme_controller *ctrlr)
int err, i;
uint64_t max;
/* Limit HMB to 1% of RAM size per device by default. */
max = (uint64_t)physmem * PAGE_SIZE / 100;
/* Limit HMB to 5% of RAM size per device by default. */
max = (uint64_t)physmem * PAGE_SIZE / 20;
TUNABLE_UINT64_FETCH("hw.nvme.hmb_max", &max);
min = (long long unsigned)ctrlr->cdata.hmmin * 4096;