svn commit: r207071 - head/sys/dev/sge

[Pyun YongHyeon]

Author: yongari
Date: Thu Apr 22 20:25:07 2010
New Revision: 207071
URL: http://svn.freebsd.org/changeset/base/207071

Log:
  Intialize interrupt moderation control register. The magic value
  was chosen by lots of trial and errors. The chosen value shows
  good interrupt moderation without additional latency.
  Without this change, controller can generate more than 140k
  interrupts per second under high network load.
  
  Submitted by:	xclin <xclin <> cs dot nctu dot edu dot tw >

Modified:
  head/sys/dev/sge/if_sge.c

Modified: head/sys/dev/sge/if_sge.c
==============================================================================
--- head/sys/dev/sge/if_sge.c	Thu Apr 22 19:18:10 2010	(r207070)
+++ head/sys/dev/sge/if_sge.c	Thu Apr 22 20:25:07 2010	(r207071)
@@ -1551,10 +1551,13 @@ sge_init_locked(struct sge_softc *sc)
 	/*
 	 * XXX Try to mitigate interrupts.
 	 */
+	CSR_WRITE_4(sc, IntrControl, 0x08880000);
+#ifdef notyet
 	if (sc->sge_intrcontrol != 0)
 		CSR_WRITE_4(sc, IntrControl, sc->sge_intrcontrol);
 	if (sc->sge_intrtimer != 0)
 		CSR_WRITE_4(sc, IntrTimer, sc->sge_intrtimer);
+#endif
 
 	/*
 	 * Clear and enable interrupts.