diff options
| author |   mikeb <mikeb@openbsd.org> | 2016-07-29 18:31:22 +0000 |
|---|---|---|
| committer | mikeb <mikeb@openbsd.org> | 2016-07-29 18:31:22 +0000 |
| commit | e9fd943502925210d46ad635c5dec91983a6d08b (patch) | |
| tree | 907b9cd39b9e2e0550ad648944d032f07d298a2a /sys | |
| parent | max name servers is currently 5, not 3, apparently; (diff) | |
| download | wireguard-openbsd-e9fd943502925210d46ad635c5dec91983a6d08b.tar.xz wireguard-openbsd-e9fd943502925210d46ad635c5dec91983a6d08b.zip | |
Reduce the amount of sent TX producer notifications; from FreeBSD
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/pv/if_xnf.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/sys/dev/pv/if_xnf.c b/sys/dev/pv/if_xnf.c index 1d8f2c4498f..35804176cc1 100644 --- a/sys/dev/pv/if_xnf.c +++ b/sys/dev/pv/if_xnf.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_xnf.c,v 1.24 2016/07/28 17:35:13 mikeb Exp $ */ +/* $OpenBSD: if_xnf.c,v 1.25 2016/07/29 18:31:22 mikeb Exp $ */ /* * Copyright (c) 2015, 2016 Mike Belopuhov @@ -468,7 +468,7 @@ xnf_start(struct ifnet *ifp) struct xnf_tx_ring *txr = sc->sc_tx_ring; struct mbuf *m; int pkts = 0; - uint32_t prod; + uint32_t prod, oprod; if (!(ifp->if_flags & IFF_RUNNING) || ifq_is_oactive(&ifp->if_snd)) return; @@ -476,7 +476,7 @@ xnf_start(struct ifnet *ifp) bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0, BUS_DMASYNC_POSTREAD); - prod = txr->txr_prod; + prod = oprod = txr->txr_prod; for (;;) { if ((XNF_TX_DESC - (prod - sc->sc_tx_cons)) < @@ -505,7 +505,10 @@ xnf_start(struct ifnet *ifp) } if (pkts > 0) { txr->txr_prod = prod; - xen_intr_signal(sc->sc_xih); + bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0, + BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); + if (prod - txr->txr_prod_event < prod - oprod) + xen_intr_signal(sc->sc_xih); ifp->if_timer = 5; } } |