Date: Sun, 29 Nov 2009 12:58:14 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: PUC Serial I/O problem - copy of gnats-filed bug report (as discussed previously) Message-ID: <20091129205814.GB77530@icarus.home.lan> In-Reply-To: <4B11EDDD.8060108@denninger.net> References: <4B100262.6000900@denninger.net> <4B102059.6040003@denninger.net> <20091127190319.GA12437@icarus.home.lan> <4B102C41.6040205@denninger.net> <4B11EDDD.8060108@denninger.net>
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On Sat, Nov 28, 2009 at 09:43:25PM -0600, Karl Denninger wrote: > Karl Denninger wrote: > > Jeremy Chadwick wrote: > > > >> On Fri, Nov 27, 2009 at 12:54:17PM -0600, Karl Denninger wrote: > >> > >> > >>> For what its worth, USB-based serial adapters also fail in the same way, > >>> but faster (they have NEVER been reliable in this regard, and this > >>> hasn't improved) > >>> > >>> > >> There must be a regression of some kind, given that some FreeBSD > >> developers have stated in the past that FTDI-based USB serial adapters > >> work great: > >> > >> http://lists.freebsd.org/pipermail/freebsd-stable/2008-March/041615.html > >> > >> Original thread: > >> > >> http://lists.freebsd.org/pipermail/freebsd-stable/2008-March/041610.html > >> > >> > > I don't know where "works great" has come from. Certainly not my > > experience in "heavy" use. > > > > For non-modem-control heavy use, it works ok. I use an 8-port fanout on > > 7.x to drive process control and it's stable. > > > > However, for heavy modem use (e.g. Hylafax) it has NEVER been stable - > > although in 8.x it won't even manage to send ONE 10-page fax most of the > > time, where under 7.x it would randomly fail in that use. Then again > > the puc() driver based serial I/O was completely stable under 7.x and > > now, with the "new architecture" it will get one or two jobs through it > > before it blows up. > > > > -- Karl > > > FYI I downgraded back to 7.2-STABLE (it was a bit hairy but I got it to > work after a small amount of screwing around) via sources > and again the machine and those serial ports are 100% stable with the > old driver infrastructure. > > The uart() infrastructure in 8.x has to be considered broken and > unusable for modems at this point folks. I recognize that nobody > flagged it until just before the release (I hadn't tried it until RC2, > and thus didn't know) but this is a literal dagger in the heart of > anyone who needs to put an actual modem on an 8.x box using the common > cards out there, and I assume it will bite just as hard for things like > a dial-in console as it will for a fax server. Karl, I agree with you in this regard. However, I'm not sure what to recommend to you with regards to getting this issue the proper attention it needs. I fully agree with the Severity (serious) and Priority (high) of the PR: http://www.freebsd.org/cgi/query-pr.cgi?pr=i386/140947 Ed Schouten appears to be giving this attention, but I'd recommend that Email communication include marcel@FreeBSD.org, "just in case" it turns out that puc(4) needs some changes. I'm certain Ed will do his best to assist tracking this one down. :-) -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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