From owner-cvs-all Tue Jan 19 23:32:03 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA17826 for cvs-all-outgoing; Tue, 19 Jan 1999 23:32:03 -0800 (PST) (envelope-from owner-cvs-all@FreeBSD.ORG) Received: from apollo.backplane.com (apollo.backplane.com [209.157.86.2]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA17759; Tue, 19 Jan 1999 23:31:59 -0800 (PST) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.9.2/8.9.1) id XAA00578; Tue, 19 Jan 1999 23:31:50 -0800 (PST) (envelope-from dillon) Date: Tue, 19 Jan 1999 23:31:50 -0800 (PST) From: Matthew Dillon Message-Id: <199901200731.XAA00578@apollo.backplane.com> To: Matthew Jacob Cc: "Kenneth D. Merry" , cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/cam cam_xpt.c References: Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk :Yes, that's true. Sorry- I wasn't thinking clearly. It is just that :retrofitting for breakage is a losing game. : :It might make more sense to limit tags to something lower *unless* there's :a quirks that says this drive can take a lot. By and large I'd really :wonder that > 8 per spindle makes any sense at all. : Oh yah, it definitely makes sense. I dunno about reversing the state of the quirk, but there are major performance benefits to being able to queue a large number of commands to a drive on a heavily loaded system. Not only that, but a SCSI unit might not address just a single HD. A RADI SCSI unit, for example, might fan-out to many drives and limiting the tags to 8 would have a severe effect on performance. -Matt Matthew Dillon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message