> Date: Tue, 31 Aug 2010 22:30:42 +0100
quoted text
> From: Stuart Henderson <stu@spacehopper.org>
> 
> running with this seems to help.

Can you try this diff instead?

Index: if_vr.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_vr.c,v
retrieving revision 1.105
diff -u -p -r1.105 if_vr.c
--- if_vr.c	19 May 2010 15:27:35 -0000	1.105
+++ if_vr.c	31 Aug 2010 21:57:55 -0000
@@ -1562,6 +1562,10 @@ vr_alloc_mbuf(struct vr_softc *sc, struc
 	d = r->vr_ptr;
 	d->vr_data = htole32(r->vr_map->dm_segs[0].ds_addr);
 	d->vr_ctl = htole32(VR_RXCTL | VR_RXLEN);
+
+	bus_dmamap_sync(sc->sc_dmat, sc->sc_listmap, 0,
+	    sc->sc_listmap->dm_mapsize, BUS_DMASYNC_PREWRITE);
+
 	d->vr_status = htole32(VR_RXSTAT);
 
 	bus_dmamap_sync(sc->sc_dmat, sc->sc_listmap, 0,