The attached patch creates the following bge loader tunables:
hw.bge.rxd=512
Number of standard receive descriptors allocated by the driver.
The default value is 256. The maximum value is 512.
hw.bge.rx_int_delay=500
This value delays the generation of receive interrupts in microseconds.
The default value is 150 microseconds.
hw.bge.tx_int_delay=500
This value delays the generation of transmit interrupts in microseconds.
The default value is 150 microseconds.
hw.bge.rx_coal_desc=64
This value delays the generation of receive interrupts until specified
number of packets will be received. The default value is 10.
hw.bge.tx_coal_desc=128
This value delays the generation of transmit interrupts until specified
number of packets will be transmited. The default value is 10.
--
Igor Sysoev
http://sysoev.ru/en/
--- sys/dev/bge/if_bge.c 2007-09-30 15:05:14.000000000 +0400
+++ sys/dev/bge/if_bge.c 2007-11-15 23:01:57.000000000 +0300
@@ -426,8 +426,18 @@
DRIVER_MODULE(miibus, bge, miibus_driver, miibus_devclass, 0, 0);
static int bge_allow_asf = 0;
+static int bge_rxd = BGE_SSLOTS;
+static int bge_rx_coal_ticks = 150;
+static int bge_tx_coal_ticks = 150;
+static int bge_rx_max_coal_bds = 10;
+static int bge_tx_max_coal_bds = 10;
TUNABLE_INT("hw.bge.allow_asf", &bge_allow_asf);
+TUNABLE_INT("hw.bge.rxd", &bge_rxd);
+TUNABLE_INT("hw.bge.rx_int_delay", &bge_rx_coal_ticks);
+TUNABLE_INT("hw.bge.tx_int_delay", &bge_tx_coal_ticks);
+TUNABLE_INT("hw.bge.rx_coal_desc", &bge_rx_max_coal_bds);
+TUNABLE_INT("hw.bge.tx_coal_desc", &bge_tx_max_coal_bds);
SYSCTL_NODE(_hw, OID_AUTO, bge, CTLFLAG_RD, 0, "BGE driver parameters");
SYSCTL_INT(_hw_bge, OID_AUTO, allow_asf, CTLFLAG_RD, &bge_allow_asf, 0,
@@ -877,10 +887,10 @@
{
int i;
- for (i = 0; i < BGE_SSLOTS; i++) {
+ for (i = 0; i < bge_rxd; i++) {
if (bge_newbuf_std(sc, i, NULL) == ENOBUFS)
return (ENOBUFS);
- };
+ }
bus_dmamap_sync(sc->bge_cdata.bge_rx_std_ring_tag,
sc->bge_cdata.bge_rx_std_ring_map,
@@ -2453,10 +2463,10 @@
/* Set default tuneable values. */
sc->bge_stat_ticks = BGE_TICKS_PER_SEC;
- sc->bge_rx_coal_ticks = 150;
- sc->bge_tx_coal_ticks = 150;
- sc->bge_rx_max_coal_bds = 10;
- sc->bge_tx_max_coal_bds = 10;
+ sc->bge_rx_coal_ticks = bge_rx_coal_ticks;
+ sc->bge_tx_coal_ticks = bge_tx_coal_ticks;
+ sc->bge_rx_max_coal_bds = bge_rx_max_coal_bds;
+ sc->bge_tx_max_coal_bds = bge_tx_max_coal_bds;
/* Set up ifnet structure */
ifp = sc->bge_ifp = if_alloc(IFT_ETHER);
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