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| author | luigi <luigi@FreeBSD.org> | 2001-10-27 00:59:17 +0000 |
|---|---|---|
| committer | luigi <luigi@FreeBSD.org> | 2001-10-27 00:59:17 +0000 |
| commit | 8972891811456ffcfe6a96c0a9797ae64f8129ab (patch) | |
| tree | 6db691be501b22b362b4e637cc9e7620c4b7b732 /sys/dev/dc | |
| parent | eb0ad6222d1267073df7b5ea3413ec5cd9477ce2 (diff) | |
| download | FreeBSD-src-8972891811456ffcfe6a96c0a9797ae64f8129ab.zip FreeBSD-src-8972891811456ffcfe6a96c0a9797ae64f8129ab.tar.gz | |
Enable round-robin arbitration between transmit and receive unit
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
Diffstat (limited to 'sys/dev/dc')
| -rw-r--r-- | sys/dev/dc/if_dc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c index 0d22729..d887464 100644 --- a/sys/dev/dc/if_dc.c +++ b/sys/dev/dc/if_dc.c @@ -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 { |
