Date: Wed, 30 Mar 2005 14:49:24 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-usb@freebsd.org Subject: Re: uplcom / ucom problems on RELENG_5 Message-ID: <20050330124923.GR33677@cicely12.cicely.de> In-Reply-To: <6.2.1.2.0.20050330071753.055388b8@64.7.153.2> References: <6.2.1.2.0.20050329222822.04f7c500@64.7.153.2> <20050330104102.GK33677@cicely12.cicely.de> <6.2.1.2.0.20050330071753.055388b8@64.7.153.2>
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On Wed, Mar 30, 2005 at 07:22:07AM -0500, Mike Tancsa wrote: > At 05:41 AM 30/03/2005, Bernd Walter wrote: > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> putc to a clist with no reserved cblocks > >> > >> fill up the console. At this point, ppp is totally hung, and I cannot > >kill > >> ppp > > > >You need a way to notice a connection failure. > >In case of modem or line failure you should see DCD loss. > >Does your cabling release DCD, or do you use LQR in your configuration? > >Have you compared the same configuration with a classical 16550 based > >serial? > > Hi, > PPP does see the loss, the problem is that its totally wedged and > cant do anything else. In the case where there is not too much data going > across the serial line, the connection dropping has no adverse effect. I > have LCP keep alives enbled and it does detect the link going away and does > properly redial. However, it seems where there is too much outstanding > data things get into trouble. That's possible - currently we can't control the transmit/receive buffers inside the USB device. > Like I said, at this point I cant even kill -9 ppp. That fits - the device buffers even survive a reopen of the tty. > What more information can I provide to help track this problem down ? We need to implement complete flushing support for uplcom. -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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