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  (8.6.12/D) Fri, 8 Aug 1997 11:13:10 +0400
From: bag@sinbin.demos.su (Alex G. Bulushev)
Message-Id: <199708080713.LAA26524@sinbin.demos.su>
Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it)
In-Reply-To: <199708080427.XAA02012@dyson.iquest.net> from "John S. Dyson" at "Aug 7, 97 11:27:18 pm"
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To: toor@dyson.iquest.net (John S. Dyson)
Date: Fri, 8 Aug 1997 11:13:09 +0400 (MSD)
Cc: freebsd@atipa.com, dyson@FreeBSD.ORG, ggm@connect.com.au,
        current@FreeBSD.ORG
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> This is the result of my "slow" recent, but not the latest, greatest
> IDE drive (WD 4GB drive.):
> 
> Command overhead is 88 usec (time_4096 = 348, time_8192 = 607)
> transfer speed is 1.57828e+07 bytes/sec
> 
> dd if=/dev/rwd1 of=/dev/null count=1600 bs=64k
> 1600+0 records in
> 1600+0 records out
> 104857600 bytes transferred in 10.881267 secs (9636525 bytes/sec)
> 

This is results for Seagate Barracuda 9GB on second channel of
adaptec 3940UW (no TAG, MEMIO etc in kernel):

dmesg output:
-------------
Probing for devices on PCI bus 2:
ahc2 <Adaptec 3940 Ultra SCSI host adapter> rev 0 int a irq 11 on pci2:4
ahc2: aic7880 Wide Channel A, SCSI Id=7, 16 SCBs
ahc2 waiting for scsi devices to settle
(ahc2:0:0): "SEAGATE ST19171W 0023" type 0 fixed SCSI 2
	     ^^^^^^^^^^^^^^^^^^^^^


dd output:
----------
dd if=/dev/rsd7e of=/dev/null count=1600 bs=64k
1600+0 records in
1600+0 records out
104857600 bytes transferred in 9.480124 secs (11060784 bytes/sec)
					      ^^^^^^^^^^^^^^^^^^

   Alex.