From owner-freebsd-bugs  Mon May 24 11:10: 9 1999
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Date: Mon, 24 May 1999 11:08:34 -0700 (PDT)
From: delaitt@cpc.wmin.ac.uk
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Subject: kern/11872: change of disk throughput when using FreeBSD-3.2-STABLE
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>Number:         11872
>Category:       kern
>Synopsis:       change of disk throughput when using FreeBSD-3.2-STABLE
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 24 11:10:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Thierry Delaitre
>Release:        3.2-STABLE FreeBSD 3.2-STABLE
>Organization:
Centre for Parallel Computing
>Environment:
FreeBSD seth.cpc.wmin.ac.uk 3.2-STABLE FreeBSD 3.2-STABLE #2: Mon May 24 15:12:26 BST 1999     root@seth.cpc.wmin.ac.uk:/usr/src/sys/compile/SETH  i386
>Description:
The problem is that the throughput of the SCSI disk was set to 80MB/s when using FreeBSD-3.2-19990522-STABLE
but the throughput has now been set to 11MB/s when using FreeBSD 3.2-STABLE
I updated my kernel sources using cvsup. This is particularly strange !

da0 at ahc0 bus 0 target 0 lun 0
May 23 11:23:11 gnu /kernel: da0: <QUANTUM VIKING II 4.5WLS 4110> Fixed Direct Access SCSI-2 device 
May 23 11:23:11 gnu /kernel: da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
May 23 11:23:11 gnu /kernel: da0: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C)

da0 at ahc0 bus 0 target 0 lun 0
da0: <QUANTUM VIKING II 4.5WLS 4110> Fixed Direct Access SCSI-2 device 
da0: 11.626MB/s transfers (5.813MHz, offset 31, 16bit)
da0: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C)

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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