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Change the default Rx FIFO drain threshold to 128 bytes; this

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reduces the likelihood of Rx FIFO overruns on machines with wimpy
PCI busses, while still allowing the interface to burst with a
reasonable size.
This commit is contained in:
thorpej 2002-02-28 20:08:11 +00:00
parent 759f452292
commit 2ba5de1eb1
1 changed files with 5 additions and 10 deletions
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15
sys/dev/pci/if_sip.c
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@ -1,4 +1,4 @@
/* $NetBSD: if_sip.c,v 1.46 2002/02/28 19:10:16 thorpej Exp $ */
/* $NetBSD: if_sip.c,v 1.47 2002/02/28 20:08:11 thorpej Exp $ */
/*-
* Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
@ -82,7 +82,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_sip.c,v 1.46 2002/02/28 19:10:16 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_sip.c,v 1.47 2002/02/28 20:08:11 thorpej Exp $");
#include "bpfilter.h"
@ -907,19 +907,14 @@ SIP_DECL(attach)(struct device *parent, struct device *self, void *aux)
sc->sc_tx_drain_thresh = 512 / 32;
/*
* Initialize the Rx FIFO drain threshold. We want to start
* dumping the packet into memory very quickly, especially
* at Gigabot speeds (the value we use is very aggressive).
* Initialize the Rx FIFO drain threshold.
*
* This is in units of 8 bytes.
*
* We should never set this value lower than 2; 14 bytes are
* required to filter the packet.
*/
#if 0
sc->sc_rx_drain_thresh = 4;
#else
sc->sc_rx_drain_thresh = RXCFG_DRTH >> RXCFG_DRTH_SHIFT;
#endif
sc->sc_rx_drain_thresh = 128 / 8;
#ifdef SIP_EVENT_COUNTERS
/*