From owner-freebsd-scsi Thu Oct 7 23:42:45 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from thelab.hub.org (nat203.183.mpoweredpc.net [142.177.203.183]) by hub.freebsd.org (Postfix) with ESMTP id CD03114CC3 for ; Thu, 7 Oct 1999 23:42:31 -0700 (PDT) (envelope-from scrappy@hub.org) Received: from localhost (scrappy@localhost) by thelab.hub.org (8.9.3/8.9.1) with ESMTP id BAA65446; Fri, 8 Oct 1999 01:07:21 -0300 (ADT) (envelope-from scrappy@hub.org) X-Authentication-Warning: thelab.hub.org: scrappy owned process doing -bs Date: Fri, 8 Oct 1999 01:07:21 -0300 (ADT) From: The Hermit Hacker To: Tom Cc: freebsd-scsi@freebsd.org Subject: Re: DPT Controller options ... one question In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Okay, thanks... If there are cache's on the DPT controllers, does the OS make use of that, or is it automagic and transparent to the OS? Just want to make sure I'm getting full use of these things... Thanks... On Thu, 7 Oct 1999, Tom wrote: > > On Thu, 7 Oct 1999, The Hermit Hacker wrote: > > > # DPT_FREELIST_IS_STACK For optimal L{1,2} CPU cache utilization, > > # enable this option. Otherwise, the transaction > > # queue is a LIFO. I cannot measure the performance > > # gain. > > > > First part seems to indicate its a good thing to enable, second part seems > > to indicate it makes no different whether I do or not...*raised eyebrow* > > As I understand, the feature looked good on the drawing board, but once > implemented didn't hold as much benefit as it would thought it could. The > feature was left in anyways. As I understand, it makes about 1 to 2% > difference. > > > Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy > > Systems Administrator @ hub.org > > primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org > > Tom > Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy Systems Administrator @ hub.org primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message