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Date: Tue, 7 Nov 2000 20:13:10 -0800 (PST)
From: Jin Guojun (DSD staff) <jin@iss-p1.lbl.gov>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/22680: ATA driver think Ultra ATA-100 drive is ATA-33
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>Number:         22680
>Category:       kern
>Synopsis:       ATA driver think Ultra ATA-100 drive is ATA-33
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Nov 07 20:20:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Jin Guojun (DSD staff)
>Release:        FreeBSD 4.1-RELEASE i386
>Organization:
>Environment:

	FreeBSD 4.1
	ASUS K7V, Intel 810E, etc., that have UDMA66 (Ultra ATA-66) or better
	 EIDE controllers
	WDC200BB Ultra ATA-100 drive	(failed to recognize)
	WDC100AA, and Maxtor 54098U8 Ultra ATA-66 (OK)

>Description:

	With above hardware, FreeBSD 4.x can recognize Ultra ATA-66 EIDE
	drives, such WDC100AA, Maxtor 54098U8, etc., and the Tx speed is
	reasonable. e.g., WDC100AA Tx rate is 22.5 MBps, and 54098U8 Tx
	rate is 29.5MBps per single disk.
	However, for Ultra ATA-100 drive, such as WDC200BB, the FreeBSD
	ATA driver thinks that is a UDMA-33 drive and drop its TX rate
	from 40 MBps (on spec., and Linux can get 34MBps) to 22.5 MBps.

>How-To-Repeat:

	Connect Ultra ATA-100 type drives to a motherboard that has
	Ultra ATA-66 or Ultra ATA-100 EIDE, boot FreeBSD and see the boot
	message or, do dmesg after boot.

>Fix:

	Do not know. But if someone can point me where should I look at it,
	I will try to finger it out.


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


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