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Implemented a better, dynamic, mechanism for adjusting the transmit

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threshold.
This commit is contained in:
David Greenman 1996-09-19 09:15:20 +00:00
parent 1aa04dd1f3
commit f9be9005ce
2 changed files with 38 additions and 4 deletions
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21
sys/dev/fxp/if_fxp.c
View File

@ -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 $
*/
/*
@ -151,6 +151,13 @@ 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.
@ -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;
/*
@ -677,6 +684,15 @@ fxp_stats_update(arg)
sp->rx_rnr_errors +
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;

21
sys/pci/if_fxp.c
View File

@ -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 $
*/
/*
@ -151,6 +151,13 @@ 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.
@ -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;
/*
@ -677,6 +684,15 @@ fxp_stats_update(arg)
sp->rx_rnr_errors +
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;