Date: Sun, 9 Feb 1997 18:36:51 -0800 (PST) From: asami@vader.cs.berkeley.edu (Satoshi Asami) To: rlb@mindspring.com Cc: freebsd-current@freebsd.org Subject: Re: AHC Driver Throughput Question Message-ID: <199702100236.SAA21100@silvia.HIP.Berkeley.EDU> In-Reply-To: <32FD295D.41C67EA6@mindspring.com> (message from Ron Bolin on Sat, 08 Feb 1997 20:33:17 -0500)
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* Am I wrong in thinking that purchasing a Ultra-Wide SCSI-3 drive
^
!
* with an advertised max throughput of 40MB/sec would not be
* fully realized using the current driver?
You are half right. The adapter is able to work in 40MB/s mode
(20MHz, 16-bit wide). However, a single drive will not give you
anywhere near 40MB/s in terms of sustained throughput. (It's a
different story if you read the same block repeatedly but you don't
need a disk to do that.)
You will need at least 2 of today's fastest drive before you start
feeling the limitation of the Fast-Wide bus.
Satoshi
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