diff options
Diffstat (limited to 'sys/dev/fxp')
| -rw-r--r-- | sys/dev/fxp/if_fxp.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/sys/dev/fxp/if_fxp.c b/sys/dev/fxp/if_fxp.c index 52d4253942b9b..7e72bec68b63e 100644 --- a/sys/dev/fxp/if_fxp.c +++ b/sys/dev/fxp/if_fxp.c @@ -24,7 +24,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: if_fxp.c,v 1.14 1996/09/06 23:08:52 phk Exp $ + * $Id: if_fxp.c,v 1.15 1996/09/18 16:18:05 davidg Exp $ */ /* @@ -152,6 +152,13 @@ static struct pci_device fxp_device = { DATA_SET(pcidevice_set, fxp_device); /* + * Set initial transmit threshold at 64 (512 bytes). This is + * increased by 64 (512 bytes) at a time, to maximum of 192 + * (1536 bytes), if an underrun occurs. + */ +static int tx_threshold = 64; + +/* * Number of transmit control blocks. This determines the number * of transmit buffers that can be chained in the CB list. * This must be a power of two. @@ -491,7 +498,7 @@ tbdinit: txp->cb_status = 0; txp->cb_command = FXP_CB_COMMAND_XMIT | FXP_CB_COMMAND_SF | FXP_CB_COMMAND_S; - txp->tx_threshold = 128; /* bytes*8 = 1024 */ + txp->tx_threshold = tx_threshold; txp->mb_head = mb_head; /* @@ -678,6 +685,15 @@ fxp_stats_update(arg) sp->rx_overrun_errors + sp->rx_shortframes; /* + * If any transmit underruns occured, bump up the transmit + * threshold by another 512 bytes (64 * 8). + */ + if (sp->tx_underruns) { + ifp->if_oerrors += sp->tx_underruns; + if (tx_threshold < 192) + tx_threshold += 64; + } + /* * If there is no pending command, start another stats * dump. Otherwise punt for now. */ @@ -696,6 +712,7 @@ fxp_stats_update(arg) * next timer event to update them. */ sp->tx_good = 0; + sp->tx_underruns = 0; sp->tx_total_collisions = 0; sp->rx_good = 0; |