From owner-freebsd-current Wed Mar 3 22:43:26 1999 Delivered-To: freebsd-current@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id EDEDA14E12; Wed, 3 Mar 1999 22:43:03 -0800 (PST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (harmony [10.0.0.6]) by rover.village.org (8.9.3/8.6.6) with ESMTP id GAA36272; Thu, 4 Mar 1999 06:42:43 GMT Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.3/8.8.3) with ESMTP id XAA27813; Wed, 3 Mar 1999 23:44:02 -0700 (MST) Message-Id: <199903040644.XAA27813@harmony.village.org> To: "Kenneth D. Merry" Subject: Re: aic0 and CAM Cc: mi@aldan.algebra.com, current@FreeBSD.ORG, nate@FreeBSD.ORG, gconnor@cisco.com In-reply-to: Your message of "Wed, 03 Mar 1999 13:50:38 MST." <199903032050.NAA86828@panzer.plutotech.com> References: <199903032050.NAA86828@panzer.plutotech.com> Date: Wed, 03 Mar 1999 23:44:02 -0700 From: Warner Losh Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <199903032050.NAA86828@panzer.plutotech.com> "Kenneth D. Merry" writes: : The 152x boards are programmed I/O only, I believe. They don't do DMA. : So it won't matter if the driver is rewritten for CAM, you'll still get : lousy performance from the board. They can do DMA, but I don't think there is a good way to know if you have a board that supports DMA and it is enabled. Even with DMA, you are limited to horrible perfomance :-( Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message