From b72a6f8a8f2fa2fa1eb5cd1bb136528bdc08ecfe Mon Sep 17 00:00:00 2001 From: Alexander Motin Date: Tue, 24 May 2016 12:40:03 +0000 Subject: [PATCH] Re-enable write combining, disabled by default at r295486. if_ntb(4) strongly benefits from WC, improving throughput from 350Mbit/s to 8-10Gbit/s on my tests. MFC after: 1 week --- sys/dev/ntb/if_ntb/if_ntb.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sys/dev/ntb/if_ntb/if_ntb.c b/sys/dev/ntb/if_ntb/if_ntb.c index 6684edd7d2f..b172cf3b6be 100644 --- a/sys/dev/ntb/if_ntb/if_ntb.c +++ b/sys/dev/ntb/if_ntb/if_ntb.c @@ -616,6 +616,10 @@ ntb_transport_probe(struct ntb_softc *ntb) mw->xlat_size = 0; mw->virt_addr = NULL; mw->dma_addr = 0; + + rc = ntb_mw_set_wc(nt->ntb, i, VM_MEMATTR_WRITE_COMBINING); + if (rc) + ntb_printf(0, "Unable to set mw%d caching\n", i); } qp_bitmap = ntb_db_valid_mask(ntb);