<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Patch-ID# 101247-01
Keywords: LX, performance, audio, speakerbox
Synopsis: SunOS 4.1.3C: Performance degradations on SPARCstation-LX without speaker box
Date: Sep/08/93

Solaris Release: 1.1C

SunOS Release: 4.1.3C

Unbundled Product: 

Unbundled Release: 

Topic: Performance degradations on SPARCstation-LX without speaker box

BugId's fixed with this patch: 1136828 1136856

Architectures for which this patch is available: sun4m

Patches which may conflict with this patch: 

Obsoleted by: 4.1.3_U1

Files included with this patch: dbri_mmcodec.o
                                dbri_subr.o

Problem Description: 

	When no speaker box is plugged into a SPARCstation-LX,
	a high dbri interrupt load occurs (~3000/sec).  This
	load can cause a fairly dramatic impact on system
	performance (~25% loss).

	The dbri chip is initialized with the wrong sbus burst
	size causing the driver to display an error/warning
	message.
 
Install Instructions: 

       (1) Save the original version of dbri_mmcodec.o and dbri_subr.o.


	    mv /sys/sun4m/OBJ/dbri_mmcodec.o /sys/sun4m/OBJ/dbri_mmcodec.o.FCS

	    mv /sys/sun4m/OBJ/dbri_subr.o /sys/sun4m/OBJ/dbri_subr.o.FCS  
      
       (2) Copy the patched file to the OBJ directory

	    cp 413c/sun4m/dbri_mmcodec.o /sys/sun4m/OBJ/dbri_mmcodec.o

	    cp 413c/sun4m/dbri_subr.o /sys/sun4m/OBJ/dbri_subr.o

       (3) build, install, and boot a new kernel.  Please refer to the
    	   System and Network Administration Manual.

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