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Since BGE_MBX_TX_HOST_PROD0_LO register is write-only to software,

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we can cache its value in the softc. Eliminates one PCI register
write per call to bge_start().

A 1.8% speedup for UDP_RR test on my old box.

Obtained from:	NetBSD(jonathan) via delphij
This commit is contained in:
Gleb Smirnoff 2005-12-18 20:26:12 +00:00
parent 0eb88f2029
commit 14bbd30f2e
2 changed files with 11 additions and 4 deletions
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14
sys/dev/bge/if_bge.c
View file

@ -947,11 +947,15 @@ bge_init_tx_ring(sc)
sc->bge_txcnt = 0;
sc->bge_tx_saved_considx = 0;
CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, 0);
/* Initialize transmit producer index for host-memory send ring. */
sc->bge_tx_prodidx = 0;
CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, sc->bge_tx_prodidx);
/* 5700 b2 errata */
if (sc->bge_chiprev == BGE_CHIPREV_5700_BX)
CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, 0);
CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, sc->bge_tx_prodidx);
/* NIC-memory send ring not used; initialize to zero. */
CSR_WRITE_4(sc, BGE_MBX_TX_NIC_PROD0_LO, 0);
/* 5700 b2 errata */
if (sc->bge_chiprev == BGE_CHIPREV_5700_BX)
@ -3040,7 +3044,7 @@ bge_start_locked(ifp)
{
struct bge_softc *sc;
struct mbuf *m_head = NULL;
u_int32_t prodidx = 0;
uint32_t prodidx;
int count = 0;
sc = ifp->if_softc;
@ -3048,7 +3052,7 @@ bge_start_locked(ifp)
if (!sc->bge_link || IFQ_DRV_IS_EMPTY(&ifp->if_snd))
return;
prodidx = CSR_READ_4(sc, BGE_MBX_TX_HOST_PROD0_LO);
prodidx = sc->bge_tx_prodidx;
while(sc->bge_cdata.bge_tx_chain[prodidx] == NULL) {
IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
@ -3108,6 +3112,8 @@ bge_start_locked(ifp)
if (sc->bge_chiprev == BGE_CHIPREV_5700_BX)
CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, prodidx);
sc->bge_tx_prodidx = prodidx;
/*
* Set a timeout in case the chip goes out to lunch.
*/

1
sys/dev/bge/if_bgereg.h
View file

@ -2416,6 +2416,7 @@ struct bge_softc {
u_int32_t bge_stat_ticks;
u_int32_t bge_rx_coal_ticks;
u_int32_t bge_tx_coal_ticks;
u_int32_t bge_tx_prodidx;
u_int32_t bge_rx_max_coal_bds;
u_int32_t bge_tx_max_coal_bds;
u_int32_t bge_tx_buf_ratio;