From owner-freebsd-questions Fri Apr 17 14:20:12 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id OAA29513 for freebsd-questions-outgoing; Fri, 17 Apr 1998 14:20:12 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from solaris.matti.ee (root@solaris.matti.ee [194.126.98.135]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id VAA29358 for ; Fri, 17 Apr 1998 21:19:57 GMT (envelope-from vallo@matti.ee) Received: from localhost (vallo@localhost [127.0.0.1]) by solaris.matti.ee (8.8.8/8.8.8.s) with SMTP id AAA18152 for ; Sat, 18 Apr 1998 00:19:51 +0300 (EET DST) Date: Sat, 18 Apr 1998 00:19:50 +0300 (EET DST) From: Vallo Kallaste X-Sender: vallo@solaris To: freebsd-questions@FreeBSD.ORG Subject: Re: One more ccdconfig question In-Reply-To: <35377B78.95B430AE@tdx.co.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, 17 Apr 1998, Karl Pielorz wrote: > In truth it is _very_ hard to work out the 'best' interleave factor for > CCD... > I run 2 CCD arrays on my system at the moment, one is set to 32 for the > interleave - and the other is 512... > > I would like to think what ever figure you use (apart from some real > 'oddball' ones like '1' or '2' etc.) is going to give some speed increase... > *** Ok, this is very nice answer, too ;) Very informative, but I know all this, so it can't help. I think this needs very good knowledge about disks and controllers and some programming experience in this area, huh. Unfortunately I don't have any. Btw, what program or method you suggest for benchmarking ? I mean something which simulates _real_ workload and puts hard stress for disk subsystem. All this must be measurable and comparable, certainly. Thanks Vallo Kallaste vallo@matti.ee To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message