Author: yongari Date: Fri Nov 26 01:48:29 2010 New Revision: 215847 URL: http://svn.freebsd.org/changeset/base/215847
Log: Disable retrying RX descriptor loading. The counter is used to set number of retry to be performed whenever controller found RX descriptor was empty. RX empty interrupt is generated only when the retry counter is over. Experimentation shows retrying RX descriptor loading increased number of dropped frames under flow-control enabled environments so disable it and have controller generate RX empty interrupt as fast as it can. While I'm here fix RXCSR_DESC_RT_CNT macro. Modified: head/sys/dev/jme/if_jmereg.h Modified: head/sys/dev/jme/if_jmereg.h ============================================================================== --- head/sys/dev/jme/if_jmereg.h Thu Nov 25 22:56:26 2010 (r215846) +++ head/sys/dev/jme/if_jmereg.h Fri Nov 26 01:48:29 2010 (r215847) @@ -275,8 +275,8 @@ #define RXCSR_RXQ2 2 #define RXCSR_RXQ3 3 #define RXCSR_DESC_RT_CNT(x) \ - ((((x) / 4) << RXCSR_DESC_RT_CNT_SHIFT) & RXCSR_DESC_RT_CNT_MASK) -#define RXCSR_DESC_RT_CNT_DEFAULT 32 + (((x) << RXCSR_DESC_RT_CNT_SHIFT) & RXCSR_DESC_RT_CNT_MASK) +#define RXCSR_DESC_RT_CNT_DEFAULT 0 /* Rx queue descriptor base address. 16bytes alignment needed. */ #define JME_RXDBA_LO 0x0024 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
