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Date: Sun, 18 May 2003 17:11:12 -0500 (CDT)
From: Derek Ragona <derek@computinginnovations.com>
Reply-To: Derek Ragona <derek@computinginnovations.com>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: SCSI U320 on SMP server won't run faster than 80 MB/S without kernel panic
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>Number:         52638
>Category:       kern
>Synopsis:       [panic] SCSI U320 on SMP server won't run faster than 80 MB/S without kernel panic
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-scsi
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 24 04:20:19 PDT 2003
>Closed-Date:    Thu Apr 11 00:40:05 UTC 2013
>Last-Modified:  Thu Apr 11 00:40:05 UTC 2013
>Originator:     Derek Ragona
>Release:        FreeBSD 5.1-BETA i386
>Organization:
>Environment:
System: FreeBSD mp2.m0nk.com 5.1-BETA FreeBSD 5.1-BETA #0: Sun May 18 15:42:40 CDT 2003 root@mp2.m0nk.com:/usr/obj/usr/src/sys/GENERICSMP i386


	Intel SE7501WV2 motherboard with SCSI onboard, it uses the Adaptec 7902 SCSI chip, This problem has been with FreeBSD 5.0 Release to Current.
>Description:
	With this motherboard, which has two Xeon hyperthreaded CPU's running at 2.66 GHz, compile a kernel from GENERIC uncommenting the two lines for SMP support.  The kernel panics when the SCSI bus is run any faster than 80 MB/s.  It drops into the debugger on boot, with 5.1 beta. In 5.0 release, it would give an error message about an invalid block and lockup.
>How-To-Repeat:
	Use a multi-processor motherboard that also has U320 SCSI, and a u320 SCSI hard drive.
	Compile and install a SMP kernel from GENERIC, uncommenting the two SMP lines.
	reboot, during the reboot set the SCSI bus in the SCSI BIOS to full speed, 320 MB/s
	Just after the SCSI devices settle you will fall into the debugger.

	If you reset the server and start to reboot, you can set the SCSI bus speed to 160 MB/s in the SCSI BIOS.
	You will have the same result as you did at 320 MB/s

	If you reset the server ans start to reboot, you can set the SCSI bus speed to 80 MB/s in the SCSI BIOS.
	The server will boot and run fine.
>Fix:

	The work around is to set the bus speed at no faster than 80 MB/s.


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-i386->freebsd-scsi 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Thu Oct 27 01:33:28 GMT 2005 
Responsible-Changed-Why:  
This sounds scsi-specific. 

To submitter: is this still a problem? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=52638 
State-Changed-From-To: open->closed 
State-Changed-By: sbruno 
State-Changed-When: Thu Apr 11 00:39:13 UTC 2013 
State-Changed-Why:  
No submitter feedback in 6 years, no kernel panic and no information  
in this ticket. on FreeBSD5.  If this is still an issue, please submit 
a new PR and let's get it fixed. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=52638 
>Unformatted:
