From owner-freebsd-hackers Thu Mar 7 14:06:55 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id OAA17847 for hackers-outgoing; Thu, 7 Mar 1996 14:06:55 -0800 (PST) Received: from ns.okbmei.msk.su (ns.okbmei.msk.su [194.190.170.40]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id OAA17808 for ; Thu, 7 Mar 1996 14:06:44 -0800 (PST) Received: from kiae.UUCP by ns.okbmei.msk.su with UUCP id AA24718 (5.67c8/IDA-1.5); Fri, 8 Mar 1996 00:41:00 +0300 Received: from freefall.FreeBSD.ORG by sequent.kiae.su with SMTP id AA27194 (5.65.kiae-2 for ); Fri, 8 Mar 1996 00:26:43 +0300 Received: from localhost (daemon@localhost) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id LAA03023 Thu, 7 Mar 1996 11:39:55 -0800 (PST) Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id LAA02840 for hackers-outgoing; Thu, 7 Mar 1996 11:36:54 -0800 (PST) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id LAA02833 for ; Thu, 7 Mar 1996 11:36:50 -0800 (PST) Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id GAA04954; Fri, 8 Mar 1996 06:33:19 +1100 Date: Fri, 8 Mar 1996 06:33:19 +1100 From: Bruce Evans Message-Id: <199603071933.GAA04954@godzilla.zeta.org.au> To: imb@scgt.oz.au, mtaylor@cybernet.com Subject: Re: Proper FreeBSD news machine Cc: hackers@FreeBSD.org X-Charset: KOI8-R X-Char-Esc: 29 Sender: owner-hackers@FreeBSD.org Precedence: bulk >This is highly dependent on the motherboard you have to put it in (stating >the bleeding obvious :-)) .. PCI is better than VESA or EISA is better than >ISA. Any decent card, Adaptec or BusLogic will do what you need. Note one >specific exception - a BT445S is of absolutely no benefit at all over a 1542 >through its inability to avoid the use of "bounce-buffers". According to /sys/i386/isa/bt5xx-445.c, only "OLD bt445s Revision A,B,C,D (nowired)" have broken 32 bit addressing. However, /sys/i386/scsi/bt.c now enables bounce buffering for all bt445s's. You can still avoid it by using option BOUNCE_BUFFERS. Option BOUNCE_BUFFERS also gives unnecessary bounce buffering for the ultrastor U24F (EISA) and U34F (VLB) controllers since ultra14f.c always enables bounce buffering in case the system is ISA or broken. I think the bt445s is still better than a 1542 because it is a newer design and is designed for VLB. Bruce