Date: Tue, 21 Apr 1998 16:37:08 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Doug White <dwhite@resnet.uoregon.edu>, Vallo Kallaste <vallo@matti.ee> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: ncrcontrol and dmesg differences Message-ID: <19980421163708.A5161@emsphone.com> In-Reply-To: <Pine.BSF.3.96.980421124722.4074X-100000@gdi.uoregon.edu>; from "Doug White" on Tue Apr 21 12:48:08 GMT 1998 References: <Pine.GSO.3.96.980421201832.9864A-100000@solaris> <Pine.BSF.3.96.980421124722.4074X-100000@gdi.uoregon.edu>
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In the last episode (Apr 21), Doug White said: > On Tue, 21 Apr 1998, Vallo Kallaste wrote: > > > T:L Vendor Device Rev Speed Max Wide Tags > > 0:0 TOSHIBA CD-ROM XM-6201TA 1030 10.0 20.0 8 - > > 5:0 QUANTUM VIKING 4.5 WSE 880R 20.0 20.0 16 8 > > 6:0 QUANTUM VIKING 4.5 WSE 880R 20.0 20.0 16 8 > > > > but dmesg are different: > > > > cd0 at scbus0 target 0 lun 0 > > cd0: 10.0 MB/s (100 ns, offset 16) > > sd0 at scbus0 target 5 lun 0 > > sd0: WIDE SCSI (16 bit) > > sd0: 40.0 MB/s (50 ns, offset 16) > > > > Why dmesg shows me 40 MB/s and ncrcontrol 20 MB/s ? SCSI BIOS boot message > > shows me 40 MB/s for hard drives, too. Are there something incorrect ? Of > > course I need the full capabilities of my new drives and adapter :) dmesg's output shows max throughput; 40.0MB/s. Note that the cycle timing is listed at 50 ns, which would mean a bus frequency of 20Mhz. NCRcontrol's "max" column is the bus frequency; 20Mhz. Multiply that by 16 bits per operation, and you get 40MB/sec. At least that's what it looks like from here. -Dan Nelson dnelson@emsphone.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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