2 files changed, 14 insertions, 5 deletions

diff --git a/sys/pci/if_xl.c b/sys/pci/if_xl.c
index b76634735689..f5e95e97e714 100644
--- a/sys/pci/if_xl.c
+++ b/sys/pci/if_xl.c
@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: if_xl.c,v 1.99 1999/05/04 20:29:58 wpaul Exp $
+ *	$Id: if_xl.c,v 1.36 1999/05/05 17:05:06 wpaul Exp $
  */
 
 /*
@@ -159,7 +159,7 @@
 
 #if !defined(lint)
 static const char rcsid[] =
-	"$Id: if_xl.c,v 1.99 1999/05/04 20:29:58 wpaul Exp $";
+	"$Id: if_xl.c,v 1.36 1999/05/05 17:05:06 wpaul Exp $";
 #endif
 
 /*
@@ -2113,8 +2113,15 @@ static void xl_txeoc(sc)
 			 * first generation 3c90X chips.
 			 */
 			CSR_WRITE_1(sc, XL_TX_FREETHRESH, XL_PACKET_SIZE >> 8);
+			if (txstat & XL_TXSTATUS_UNDERRUN &&
+			    sc->xl_tx_thresh < XL_PACKET_SIZE) {
+				sc->xl_tx_thresh += XL_MIN_FRAMELEN;
+				printf("xl%d: tx underrun, increasing tx start"
+				    " threshold to %d bytes\n", sc->xl_unit,
+				    sc->xl_tx_thresh);
+			}
 			CSR_WRITE_2(sc, XL_COMMAND,
-			    XL_CMD_TX_SET_START|XL_MIN_FRAMELEN);
+			    XL_CMD_TX_SET_START|sc->xl_tx_thresh);
 			if (sc->xl_type == XL_TYPE_905B) {
 				CSR_WRITE_2(sc, XL_COMMAND,
 				XL_CMD_SET_TX_RECLAIM|(XL_PACKET_SIZE >> 4));
@@ -2512,7 +2519,8 @@ static void xl_init(xsc)
 	CSR_WRITE_1(sc, XL_TX_FREETHRESH, XL_PACKET_SIZE >> 8);
 
 	/* Set the TX start threshold for best performance. */
-	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_SET_START|XL_MIN_FRAMELEN);
+	sc->xl_tx_thresh = XL_MIN_FRAMELEN;
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_SET_START|sc->xl_tx_thresh);
 
 	/*
 	 * If this is a 3c905B, also set the tx reclaim threshold.
diff --git a/sys/pci/if_xlreg.h b/sys/pci/if_xlreg.h
index 312839942467..76614f9962b8 100644
--- a/sys/pci/if_xlreg.h
+++ b/sys/pci/if_xlreg.h
@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: if_xlreg.h,v 1.27 1999/04/29 17:56:55 wpaul Exp $
+ *	$Id: if_xlreg.h,v 1.15 1999/05/05 17:05:07 wpaul Exp $
  */
 
 #define XL_EE_READ	0x0080	/* read, 5 bit address */
@@ -553,6 +553,7 @@ struct xl_softc {
 	u_int8_t		xl_want_auto;
 	u_int8_t		xl_autoneg;
 	u_int8_t		xl_stats_no_timeout;
+	u_int16_t		xl_tx_thresh;
 	caddr_t			xl_ldata_ptr;
 	struct xl_list_data	*xl_ldata;
 	struct xl_chain_data	xl_cdata;