Author: mav
Date: Tue May 24 12:40:03 2016
New Revision: 300610
URL: https://svnweb.freebsd.org/changeset/base/300610
Log:
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
Modified:
head/sys/dev/ntb/if_ntb/if_ntb.c
Modified: head/sys/dev/ntb/if_ntb/if_ntb.c
==============================================================================
--- head/sys/dev/ntb/if_ntb/if_ntb.c Tue May 24 12:20:23 2016
(r300609)
+++ head/sys/dev/ntb/if_ntb/if_ntb.c Tue May 24 12:40:03 2016
(r300610)
@@ -616,6 +616,10 @@ ntb_transport_probe(struct ntb_softc *nt
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);
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