Return to BSD News archive
Received: by minnie.vk1xwt.ampr.org with NNTP id AA5868 ; Fri, 01 Jan 93 01:59:09 EST Path: sserve!manuel.anu.edu.au!munnari.oz.au!uunet!stanford.edu!morrow.stanford.edu!morrow!aoki From: aoki@risk.stanford.edu (ikuro aoki) Newsgroups: comp.unix.bsd Subject: Re: [386bsd] Queries for the new scsi driver. Date: 3 Jan 93 03:32:09 Organization: Stanford University, Stanford, CA, USA. Lines: 26 Message-ID: <AOKI.93Jan3033209@risk.Stanford.EDU> References: <3813@tansei1.tansei.cc.u-tokyo.ac.jp> NNTP-Posting-Host: risk.stanford.edu In-reply-to: mhiroshi@tansei.cc.u-tokyo.ac.jp's message of 3 Jan 93 09:48:59 GMT Hello, >> What is the advantage of the new scsi driver >> compared the old scsi drivers ? At least, it permits me using a faster aha1742a SCSI adapter instead of an aha1542b. And lots more useful features. >> Was the old scsi driver not using DMA transfer >> but program data transfer? Yes, the original scsi driver uses DMA transfer. I believe that the new scsi driver dosen't speed up your file access basicly if you use the same aha1542b adapter. The limitation is the transfer speed of the adapter. >> aha0 reading board settings, 150 nSEC ok, use 200 nSEC You may look into /sys/i386/isa/aha1542.c source code, especially around aha_set_bus_speed() function ~ 1383. It's better than descussing. # I don't have any idea for your Main problem. Excuse me. -- Ikuro Aoki aoki@risk.Stanford.EDU