Date: Sun, 9 Feb 1997 12:46:07 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: rlb@mindspring.com (Ron Bolin) Cc: freebsd-current@freebsd.org Subject: Re: AHC Driver Throughput Question Message-ID: <Mutt.19970209124607.j@uriah.heep.sax.de> In-Reply-To: <32FD295D.41C67EA6@mindspring.com>; from Ron Bolin on Feb 8, 1997 20:33:17 -0500 References: <32FD295D.41C67EA6@mindspring.com>
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As Ron Bolin wrote: > I have an Adaptech 2940UW controller. I am interested in purchasing > an Ultra-Wide SCSI-3 drive with the capability of 40MB/sec throughput. > > After giving the driver source a quick look, it appears the Ultra > and Wide are supported, but not together since the max throughput > registered by the driver is 20MB/sec in 16 bit mode of operation. You're confusing MHz and MB/s. (Peak) throughput = sync rate * bus width. So either a 10 MHz 32-bit bus or a 20 MHz 16-bit bus would yield you 40 MB/s peak rate. (I'm not sure whether 32-bit does already work though.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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