advocacy/73642: More AHC_ALLOW_MEMIO
Wei-Kai Wu
wkwu at csie.nctu.edu.tw
Sun Nov 7 07:40:28 PST 2004
>Number: 73642
>Category: advocacy
>Synopsis: More AHC_ALLOW_MEMIO
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-advocacy
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun Nov 07 15:40:27 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Wei-Kai Wu
>Release: FreeBSD 4.10-STABLE i386
>Organization:
Kavalan
>Environment:
System: FreeBSD 4.X-Series , 5.X-Series
>Description:
The adaptec SCSI controller such as Aic7892 (29160 SCSI adapter) uses "ahc"
driver which has an option "AHC_ALLOW_MEMIO".
The AHC_ALLOW_MEMIO enhances the I/O performance a lot compared with those
SCSI drivers have no MEMIO option.
I have tried Adaptec AIC7902 Ultra320 SCSI adapter (which has no MEMIO option),
and the performance is really bad compared with Aic7892 MEMIO option.
I doubt why there is no MEMIO option for other SCSI controllers?
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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