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Dynamically increase TX start threshold if TX underruns are detected.

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This commit is contained in:
Bill Paul 1999-05-05 17:05:07 +00:00
parent 1e58fe3903
commit b346e4e2e4
2 changed files with 14 additions and 5 deletions
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16
sys/pci/if_xl.c
View File

@ -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 1.101 1999/05/05 16:54:54 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 1.101 1999/05/05 16:54:54 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.

3
sys/pci/if_xlreg.h
View File

@ -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 1.28 1999/05/05 15:01:27 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;