From owner-freebsd-hackers Thu Jan 9 13:50:47 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id NAA23471 for hackers-outgoing; Thu, 9 Jan 1997 13:50:47 -0800 (PST) Received: from thelab.hub.org (hal-ns1-28.netcom.ca [207.181.94.92]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id NAA23464 for ; Thu, 9 Jan 1997 13:50:43 -0800 (PST) Received: from localhost (scrappy@localhost) by thelab.hub.org (8.8.4/8.8.2) with SMTP id RAA09039; Thu, 9 Jan 1997 17:49:06 -0400 (AST) X-Authentication-Warning: thelab.hub.org: scrappy owned process doing -bs Date: Thu, 9 Jan 1997 17:49:05 -0400 (AST) From: The Hermit Hacker To: Joe Greco cc: Joe McGuckin , freebsd-hackers@freebsd.org Subject: Re: CCD questions (news server) In-Reply-To: <199701092014.OAA07665@solaria.sol.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Thu, 9 Jan 1997, Joe Greco wrote: > > I just switched over our news machine from a tired old Sun SS2 (with Weitek > > upgrade) to a 133Mhz pentium with 12G of Barracudas ccd'd together, > > > > I arbitrarily set the interleave to 64. Is there a good method to derive > > the optimal interleave factor? > > Yes - search the hackers mailing list archive for usenet, news, ccd, > interleave, etc. and you will find one of my several essays on the subject. > > You are killing your performance with such a low number. > Now I'm curious, what interleave are you using? I don't assume its possible to *change* the interleave once the device is created, is it? I'm running even lower (32), since...well...I didn't know better :( Should maybe add a note to the man page that states a recommended value for a news server, or something like that? :)