diff options
| author | Jonathan Matthew <jmatthew@cvs.openbsd.org> | 2019-06-12 01:38:31 +0000 |
|---|---|---|
| committer | Jonathan Matthew <jmatthew@cvs.openbsd.org> | 2019-06-12 01:38:31 +0000 |
| commit | 824c2554ae55b76aa45cda4140510807b15ac86c (patch) | |
| tree | 4b2b72859b0e737677cd661d7eb5635c89f89571 /sys | |
| parent | d357c52bf710e7f1f545c0eb6681590c0d8a03c1 (diff) | |
Set interrupt moderation on the completion queue for around 10000
interrupts per second, or 90% of the cq size.
ok dlg@
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/pci/if_mcx.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sys/dev/pci/if_mcx.c b/sys/dev/pci/if_mcx.c index fba4c01a6a0..c1fcd15817c 100644 --- a/sys/dev/pci/if_mcx.c +++ b/sys/dev/pci/if_mcx.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_mcx.c,v 1.26 2019/06/11 06:28:09 dlg Exp $ */ +/* $OpenBSD: if_mcx.c,v 1.27 2019/06/12 01:38:30 jmatthew Exp $ */ /* * Copyright (c) 2017 David Gwynne <dlg@openbsd.org> @@ -75,6 +75,10 @@ #define MCX_LOG_RQ_SIZE 10 #define MCX_LOG_SQ_SIZE 11 +/* completion event moderation - about 10khz, or 90% of the cq */ +#define MCX_CQ_MOD_PERIOD 50 +#define MCX_CQ_MOD_COUNTER (((1 << (MCX_LOG_CQ_SIZE - 1)) * 9) / 10) + #define MCX_LOG_SQ_ENTRY_SIZE 6 #define MCX_SQ_ENTRY_MAX_SLOTS 4 #define MCX_SQ_SEGS_PER_SLOT \ @@ -3879,7 +3883,9 @@ mcx_create_cq(struct mcx_softc *sc, int eqn) mbin->cmd_cq_ctx.cq_uar_size = htobe32( (MCX_LOG_CQ_SIZE << MCX_CQ_CTX_LOG_CQ_SIZE_SHIFT) | sc->sc_uar); mbin->cmd_cq_ctx.cq_eqn = htobe32(eqn); - /* set event moderation bits here */ + mbin->cmd_cq_ctx.cq_period_max_count = htobe32( + (MCX_CQ_MOD_PERIOD << MCX_CQ_CTX_PERIOD_SHIFT) | + MCX_CQ_MOD_COUNTER); mbin->cmd_cq_ctx.cq_doorbell = htobe64( MCX_DMA_DVA(&sc->sc_doorbell_mem) + MCX_CQ_DOORBELL_OFFSET + (MCX_CQ_DOORBELL_SIZE * sc->sc_num_cq)); |