Date: Thu, 8 Oct 1998 01:01:56 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: dan@math.berkeley.edu (Dan Strick) Cc: tlambert@primenet.com, dan@math.berkeley.edu, freebsd-smp@FreeBSD.ORG Subject: Re: hw platform Q - what's a good smp choice these days? Message-ID: <199810080101.SAA27130@usr08.primenet.com> In-Reply-To: <199810072111.OAA00662@math.berkeley.edu> from "Dan Strick" at Oct 7, 98 02:11:25 pm
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> > > > > Might be faster IO per drive with SCSI, but I'd rather have twice the > > > > > capacity and spend the remainder on more RAM. > > > > The I/O is faster by a factor of N, where N is the number of tagged > > commands supported by the drive. For IBM drives, SCSI can be as much > > as 64 times faster than IDE because it can be as much as 64 times more > > concurrent. > > Did I ever buy a used car from you? N times the driver-controller-drive + drive-controller-drive latency. TCP/IP sliding windows work the same way: instead of N latencies for N packets, you get 1 latency amortized across N packets. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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