diff options
| -rw-r--r-- | sys/dev/ixgbe/ixgbe.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/dev/ixgbe/ixgbe.c b/sys/dev/ixgbe/ixgbe.c index bbaacc4..32a2884 100644 --- a/sys/dev/ixgbe/ixgbe.c +++ b/sys/dev/ixgbe/ixgbe.c @@ -1143,6 +1143,14 @@ ixgbe_init_locked(struct adapter *adapter) txdctl |= IXGBE_TXDCTL_ENABLE; /* Set WTHRESH to 8, burst writeback */ txdctl |= (8 << 16); + /* + * When the internal queue falls below PTHRESH (32), + * start prefetching as long as there are at least + * HTHRESH (1) buffers ready. The values are taken + * from the Intel linux driver 3.8.21. + * Prefetching enables tx line rate even with 1 queue. + */ + txdctl |= (16 << 0) | (1 << 8); IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(i), txdctl); } |
