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Enable round-robin arbitration between transmit and receive unit

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in the 21143, instead of giving priority to the receive unit.
This gives a 10-15% performance improvement in the forwarding rate
under heavy load.

Reviewed-by: Bill Paul
This commit is contained in:
Luigi Rizzo 2001-10-27 00:59:17 +00:00
parent a4c0058691
commit 935fe01014
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85571
2 changed files with 10 additions and 0 deletions
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5
sys/dev/dc/if_dc.c
View file

@ -3057,6 +3057,11 @@ static void dc_init(xsc)
CSR_WRITE_4(sc, DC_BUSCTL, 0);
else
CSR_WRITE_4(sc, DC_BUSCTL, DC_BUSCTL_MRME|DC_BUSCTL_MRLE);
/*
* Evenly share the bus between receive and transmit process.
*/
if (DC_IS_INTEL(sc))
DC_SETBIT(sc, DC_BUSCTL, DC_BUSCTL_ARBITRATION);
if (DC_IS_DAVICOM(sc) || DC_IS_INTEL(sc)) {
DC_SETBIT(sc, DC_BUSCTL, DC_BURSTLEN_USECA);
} else {

5
sys/pci/if_dc.c
View file

@ -3057,6 +3057,11 @@ static void dc_init(xsc)
CSR_WRITE_4(sc, DC_BUSCTL, 0);
else
CSR_WRITE_4(sc, DC_BUSCTL, DC_BUSCTL_MRME|DC_BUSCTL_MRLE);
/*
* Evenly share the bus between receive and transmit process.
*/
if (DC_IS_INTEL(sc))
DC_SETBIT(sc, DC_BUSCTL, DC_BUSCTL_ARBITRATION);
if (DC_IS_DAVICOM(sc) || DC_IS_INTEL(sc)) {
DC_SETBIT(sc, DC_BUSCTL, DC_BURSTLEN_USECA);
} else {