From owner-freebsd-scsi Thu Oct 7 20:55:52 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from misery.sdf.com (misery.sdf.com [204.244.213.49]) by hub.freebsd.org (Postfix) with ESMTP id A075F14F25 for ; Thu, 7 Oct 1999 20:55:42 -0700 (PDT) (envelope-from tom@sdf.com) Received: from tom (helo=localhost) by misery.sdf.com with local-esmtp (Exim 2.12 #1) id 11ZPdd-0004eg-00; Thu, 7 Oct 1999 19:20:05 -0700 Date: Thu, 7 Oct 1999 19:20:04 -0700 (PDT) From: Tom To: The Hermit Hacker 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 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message