>Number:         29831
>Category:       kern
>Synopsis:       interface reset on rx ring overrun
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 30 02:41:00 +0000 2005
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 3.99.1
>Organization:

>Environment:
	
	
System: NetBSD kaeru 3.99.1 NetBSD 3.99.1 (build.kaeru) #304: Tue Mar 29 13:54:14 JST 2005 takashi@kaeru:/home/takashi/work/kernel/build.kaeru i386
Architecture: i386
Machine: i386
>Description:
	some drivers including wm(4) reset the interface on rx ring overrun.
	it just makes the situation worse, if the overrun is merely a symptom
	of too heavy load.
>How-To-Repeat:
>Fix:

Index: if_wm.c
===================================================================
--- if_wm.c	(revision 1095)
+++ if_wm.c	(working copy)
@@ -2042,11 +2044,13 @@ wm_intr(void *arg)
 			wm_linkintr(sc, icr);
 		}
 
+#if 0
 		if (icr & ICR_RXO) {
 			log(LOG_WARNING, "%s: Receive overrun\n",
 			    sc->sc_dev.dv_xname);
 			wantinit = 1;
 		}
+#endif
 	}
 
 	if (handled) {
@@ -2709,7 +2713,7 @@ wm_init(struct ifnet *ifp)
 	 */
 	CSR_WRITE(sc, WMREG_IMC, 0xffffffffU);
 	sc->sc_icr = ICR_TXDW | ICR_LSC | ICR_RXSEQ | ICR_RXDMT0 |
-	    ICR_RXO | ICR_RXT0;
+	    /* ICR_RXO | */ ICR_RXT0;
 	if ((sc->sc_flags & WM_F_HAS_MII) == 0)
 		sc->sc_icr |= ICR_RXCFG;
 	CSR_WRITE(sc, WMREG_IMS, sc->sc_icr);

>Unformatted: