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
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