Date: Mon, 21 Apr 2008 09:21:16 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: stable@freebsd.org, Garrett Wollman <wollman@hergotha.csail.mit.edu> Subject: Re: umass causes panic on 7 amd64 Message-ID: <1208766076.1940.35.camel@localhost> In-Reply-To: <20080418224605.GA19226@server.vk2pj.dyndns.org> References: <1208046195.00056100.1208036121@10.7.7.3> <539c60b90804141549u6a138ad9u9c77bbfcbbad0ff3@mail.gmail.com> <20080415175347.GA29045@slackbox.xs4all.nl> <539c60b90804151134q7a25a141m1205a1b04d8ffc2c@mail.gmail.com> <20080415192028.GA31706@slackbox.xs4all.nl> <539c60b90804160910q3a242d7amb474b40065d6c9c6@mail.gmail.com> <1208373797.00057829.1208362805@10.7.7.3> <48071956.2090103@icyb.net.ua> <767FB33508C0E8E4E3CAA61A@utd65257.utdallas.edu> <200804172313.m3HNDHFo006697@hergotha.csail.mit.edu> <20080418224605.GA19226@server.vk2pj.dyndns.org>
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--=-WFLc2VZMkY6UN91cMJPt Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Sat, 2008-04-19 at 08:46 +1000, Peter Jeremy wrote: > On Thu, Apr 17, 2008 at 07:13:17PM -0400, Garrett Wollman wrote: > >In my experience, umass over EHCI has never worked on any machine > >ever, going back to 5.x and over multiple kinds of umass devices. (I > >never saw panics, only triple-fault CPU resets.) >=20 > OTOH, I've had mixed results, though I haven't seen panics caused by > EHCI. umass has a tendency to panic when it trips over an interface > bug between bus_dmamem_alloc(9) and contigmalloc(9) which has been > present since at least 4.x, though the work-arounds have improved and > this is less of a problem than it was 3 years ago. >=20 > On my laptop (HP nx6125, ATI SB400 chipset), I haven't had any problems > with EHCI in 6.x or 7.0 (both amd64 - I can't recall if I've tried ECHI > whilst running i386). >=20 > My son's laptop (HP V6107au, nVIDIA MCP51 chipset, 6.x/amd64) gives > varying results (sometimes it works, sometimes it doesn't) and he's > found that plugging flashdisks into the USB hub on his keyboard gives > better results than plugging them into the system (which doesn't make > sense to me - they still show a attached to EHCI). >=20 > My work desktop (Dell OptiPlex GX620, Intel ICH7 chipset 7.0/amd64) > refuses to acknowledge EHCI devices - it just reports timeouts and > disables that USB port. [See my recent posting to -amd64]. >=20 Is the keyboard hub self powered? Maybe some devices draw more current than expected, causing fragile bus powered ports to fail (which would quickly cause a panic). Tom --=-WFLc2VZMkY6UN91cMJPt Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (FreeBSD) iEYEABECAAYFAkgMTnQACgkQlcRvFfyds/fHDACghh9UB+amW9yWdiMBpl9/Ee8U WIgAoME67h+FYjiRHkBpFSGJ5LlRbFG4 =cw3w -----END PGP SIGNATURE----- --=-WFLc2VZMkY6UN91cMJPt--
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