diff options
| author | Mike Belopuhov <mikeb@cvs.openbsd.org> | 2012-07-05 14:47:29 +0000 |
|---|---|---|
| committer | Mike Belopuhov <mikeb@cvs.openbsd.org> | 2012-07-05 14:47:29 +0000 |
| commit | 4cd2b471e698fb7c2290949d9cc373f4f25236f5 (patch) | |
| tree | 60e46ae10860592f0e79dad26ad6b59c4acb7e8c | |
| parent | 002ae7ed11711796174e19577bab47db218185ee (diff) | |
set the prefetch threshold for 99'er as well. provides some additional
performance improvement. obtained from freebsd.
| -rw-r--r-- | sys/dev/pci/if_ix.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/dev/pci/if_ix.c b/sys/dev/pci/if_ix.c index b1a173ae03d..9649ff8af94 100644 --- a/sys/dev/pci/if_ix.c +++ b/sys/dev/pci/if_ix.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_ix.c,v 1.63 2012/07/05 14:36:22 mikeb Exp $ */ +/* $OpenBSD: if_ix.c,v 1.64 2012/07/05 14:47:28 mikeb Exp $ */ /****************************************************************************** @@ -728,6 +728,12 @@ ixgbe_init(void *arg) txdctl |= IXGBE_TXDCTL_ENABLE; /* Set WTHRESH to 8, burst writeback */ txdctl |= (8 << 16); + /* + * When the internal queue falls below PTHRESH (16), + * start prefetching as long as there are at least + * HTHRESH (1) buffers ready. + */ + txdctl |= (16 << 0) | (1 << 8); IXGBE_WRITE_REG(&sc->hw, IXGBE_TXDCTL(i), txdctl); } |