Date: Fri, 8 Aug 1997 11:13:09 +0400 (MSD) From: bag@sinbin.demos.su (Alex G. Bulushev) To: toor@dyson.iquest.net (John S. Dyson) Cc: freebsd@atipa.com, dyson@FreeBSD.ORG, ggm@connect.com.au, current@FreeBSD.ORG Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) Message-ID: <199708080713.LAA26524@sinbin.demos.su> In-Reply-To: <199708080427.XAA02012@dyson.iquest.net> from "John S. Dyson" at "Aug 7, 97 11:27:18 pm"
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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.
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