- Fix Yukon ram sizing.
- Lower interrupt moderation timer to improve performance.
- Keep tx queue running by kicking the tx bmu repeatedly.
- Handle if_timer a bit better.

From NetBSD

Index: if_sk.c
================================================== =================
RCS file: /cvs/src/sys/dev/pci/if_sk.c,v
retrieving revision 1.47
diff -u -p -r1.47 if_sk.c
--- if_sk.c 14 Oct 2004 15:27:39 -0000 1.47
+++ if_sk.c 17 Oct 2004 04:30:39 -0000
@@ -1118,7 +1118,7 @@ void sk_reset(struct sk_softc *sc)
* register represents 18.825ns, so to specify a timeout in
* microseconds, we have to multiply by 54.
*/
- sk_win_write_4(sc, SK_IMTIMERINIT, SK_IM_USECS(200));
+ sk_win_write_4(sc, SK_IMTIMERINIT, SK_IM_USECS(100));
sk_win_write_4(sc, SK_IMMR, SK_ISR_TX1_S_EOF|SK_ISR_TX2_S_EOF|
SK_ISR_RX1_EOF|SK_ISR_RX2_EOF);
sk_win_write_1(sc, SK_IMTIMERCTL, SK_IMCTL_START);
@@ -1528,19 +1528,16 @@ skc_attach(struct device *parent, struct
goto fail;
break;
}
-
- DPRINTFN(2, ("skc_attach: ramsize=%d(%dk), rboff=%d\n",
- sc->sk_ramsize, sc->sk_ramsize / 1024,
- sc->sk_rboff));
} else {
- sc->sk_ramsize = 0x20000;
+ u_int8_t val = sk_win_read_1(sc, SK_EPROM0);
+ sc->sk_ramsize = ( val == 0 ) ? 0x20000 : (( val * 4 )*1024);
sc->sk_rboff = SK_RBOFF_0;
-
- DPRINTFN(2, ("skc_attach: ramsize=%dk (%d), rboff=%d\n",
- sc->sk_ramsize / 1024, sc->sk_ramsize,
- sc->sk_rboff));
}

+ DPRINTFN(2, ("skc_attach: ramsize=%d (%dk), rboff=%d\n",
+ sc->sk_ramsize, sc->sk_ramsize / 1024,
+ sc->sk_rboff));
+
/* Read and save physical media type */
switch(sk_win_read_1(sc, SK_PMDTYPE)) {
case SK_PMD_1000BASESX:
@@ -1949,8 +1946,11 @@ sk_txeof(struct sk_if_softc *sc_if)
}
sc_if->sk_cdata.sk_tx_cnt--;
SK_INC(idx, SK_TX_RING_CNT);
- ifp->if_timer = 0;
}
+ if (sc_if->sk_cdata.sk_tx_cnt == 0)
+ ifp->if_timer = 0;
+ else /* nudge chip to keep tx ring moving */
+ CSR_WRITE_4(sc, sc_if->sk_tx_bmu, SK_TXBMU_TX_START);

sc_if->sk_cdata.sk_tx_cons = idx;