From owner-freebsd-current  Sun Mar 28 23:45:26 1999
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From: Soren Schmidt <sos@freebsd.dk>
Message-Id: <199903290745.JAA57288@freebsd.dk>
Subject: Re: UPDATE4: ATA/ATAPI driver new version available.
In-Reply-To: <Pine.BSF.4.05.9903281748170.78386-100000@janus.syracuse.net> from Brian Feldman at "Mar 28, 1999  5:55:55 pm"
To: green@unixhelp.org (Brian Feldman)
Date: Mon, 29 Mar 1999 09:45:01 +0200 (CEST)
Cc: current@FreeBSD.ORG
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It seems Brian Feldman wrote:
>    I tried this out just as soon as I saw the announcement! Your driver is
> really coming along well. I have three basic problems with it:
> 
> 	1. A hard reset is necessary to get the CD-ROM drive to work with acd.
> 
> wdc0: unit 1 (atapi): <NEC                 CD-ROM DRIVE:285/3.04>, removable, dma, iordy
> wcd0: drive speed 2067KB/sec, 128KB cache
> wcd0: supported read types: CD-R, CD-DA
> wcd0: Audio: play, 16 volume levels
> wcd0: Mechanism: ejectable tray
> wcd0: Medium: no/blank disc inside, unlocked

Ugh, one of those NEC's again, it seems there are many problems with
their CDROM's, I'll try to get ahold of some...

> 
> 	2. My LS-120 still has no reliability with the driver, as reads are
> corrupted extremely often.
> 
> wdc1: unit 0 (atapi): <LS-120 COSM   02              UHD Floppy/0271C09T>, removable, iordy
> wfd0: medium type unknown (no disk)

Hmm, my ZIP works just fine, I'll see what I can come up with..

> 	3. DMA is ineffective with file-system use. I can read from the raw
> device rad0 at 4.5MB/s with a 1mb block size, but when I use iozone performance
> is around 2.5MB/s. Mounting wd shouldn't affect that, should it? I used the
> same device special files to mount as before, with ATA_STATIC being used,
> and noticed this. Better yet, I'll try this with a corrected fstab then
> report back. 

This is more likely due to the last changes Julian/Matt has committed to
vfs_bio.c et all, it hoses our I/O performance pretty badly. There is
work underways to fix it though.

-Søren


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