From owner-freebsd-hackers Wed Jan 8 05:09:32 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id FAA04003 for hackers-outgoing; Wed, 8 Jan 1997 05:09:32 -0800 (PST) Received: from smtp-gw01.ny.us.ibm.net (smtp-gw01.ny.us.ibm.net [165.87.194.252]) by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id FAA03998 for ; Wed, 8 Jan 1997 05:09:30 -0800 (PST) Received: (from uucp@localhost) by smtp-gw01.ny.us.ibm.net (8.6.9/8.6.9) id NAA198420; Wed, 8 Jan 1997 13:09:29 GMT Message-Id: <199701081309.NAA198420@smtp-gw01.ny.us.ibm.net> Received: from slip166-72-229-168.va.us.ibm.net(166.72.229.168) by smtp-gw01.ny.us.ibm.net via smap (V1.3mjr) id smaOrYCrx; Wed Jan 8 13:09:19 1997 Reply-To: From: "Steve Sims" To: "Hackers" Cc: Subject: Bounce Buffers and CCD Date: Wed, 8 Jan 1997 08:07:39 -0500 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_01BBFD3B.03CA2DA0" Content-Transfer-Encoding: 7bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk This is a multi-part message in MIME format. ------=_NextPart_000_01BBFD3B.03CA2DA0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I've had a bounty of problems getting `ccd` to work with my Adaptech 1542-CF. Under 2.2-mumble the symptoms were the dreaded: vm_bounce_alloc: b_bufsize(0x80) < b_count(0x200) !! panic: vm_bounce_alloc error. Worked fine with only 16 Meg installed, I assumed that this "might" have been fixed in -CURRENT, sup'd that, rebuilt everything. Still no go. So I turned to the archives to see if this was FAQ and stumbled across the attached message (patch included). I figured that I had nothing to lose, so I 'patch < /tmp/foo', rebuilt kernel, reboot - SUCCESS! (Thanks, John!) Question: Is there any reason that this one-liner has not been folded in to -CURRENT, -STABLE, and kin? Related point: I believe it was Terry Lambert that stated in previous messages (words to the effect) that "option BOUNCE_BUFFERS" is not *strictly* needed; that this functionality is automatically enabled on ISA systems with >16Meg and that including "options BOUNCE_BUFFERS" in late-model kernel configs only serves to *force* BOUNCE_BUFFERS on ISA systems with =< 16Meg. I don't concur. Removing "options BOUNCE_BUFFERS" on a 32Meg system will page-fault-panic a booting box as quickly as anything else I've ever tried! (Terry, I hope I haven't quoted you out of context, but I'm here to tell ya': BOUNCE-BUFFERS is a MANDATORY option for >16M systems, at least on 3.0-CURRENT with my mo-bo having PCI, ISA and VESA!) ...sjs... ------=_NextPart_000_01BBFD3B.03CA2DA0 Content-Type: application/octet-stream; name="ccd_pat.txt" Content-Transfer-Encoding: quoted-printable Content-Description: ccd_pat (Text Document) Content-Disposition: attachment; filename="ccd_pat.txt" Date: Fri, 6 Sep 1996 22:50:07 -0500 (EST) From: "John S. Dyson" To: gordon@drogon.net (Gordon Henderson) Cc: questions@freebsd.org, scsi@freebsd.org Sender: owner-questions@freebsd.org Subject: Re: CCD Setup woes ... (Kernel Panic) >=20 > I'm tring to get a CCD going as an experiment and it's causing the = kernel > to panic.=20 >=20 Yep, there is a problem with CCD using the FreeBSD bounce scheme. Of = course, it is only noticed on ISA systems. >=20 > which resulted in a kernel panic. The message is: >=20 > vm_bounce_alloc: b_bufsize(0x80) < b_count(0x200) !! > panic: vm_bounce_alloc >=20 b_bufsize is not being setup correctly in ccd (I think). > > followed by the usual syncing disks bit. The number in the b_bufsize() = > varies from crash to crash. >=20 > Am I doing anything obviously wrong? >=20 No. Hope the following works for you!!! If it does, let me know so that I can commit it. Try this patch to ccd relative to -current (the equiv patch might work for -stable), I haven't tested this though: Index: ccd.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D RCS file: /local/home/ncvs/src/sys/dev/ccd/ccd.c,v retrieving revision 1.16 diff -C5 -r1.16 ccd.c *** ccd.c 1996/07/24 23:45:24 1.16 --- ccd.c 1996/09/07 03:46:27 *************** *** 909,918 **** --- 909,920 ---- else cbp->cb_buf.b_bcount =3D dbtob(cs->sc_ileave - cboff); if (cbp->cb_buf.b_bcount > bcount) cbp->cb_buf.b_bcount =3D bcount; =20 + cbp->cb_buf.b_bufsize =3D cbp->cb_buf.b_bcount; +=20 /* * context for ccdiodone */ cbp->cb_obp =3D bp; cbp->cb_unit =3D cs - ccd_softc; ------------------------------------------------------------------------ www@freebsd.org ------=_NextPart_000_01BBFD3B.03CA2DA0--