Date: Fri, 10 Dec 2004 11:38:57 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-gnats-submit@freebsd.org Subject: Re: misc/74786: Smartlink Modem causes interrupt storm onRELENG_4 and RELENG_5 Message-ID: <20041210112604.T28756@delplex.bde.org> In-Reply-To: <6.2.0.14.0.20041208105236.05427760@64.7.153.2> References: <200412062027.iB6KR1jE096684@www.freebsd.org> <6.2.0.14.0.20041207100615.0335e328@64.7.153.2> <6.2.0.14.0.20041208105236.05427760@64.7.153.2>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 8 Dec 2004, Mike Tancsa wrote: > At 02:22 AM 08/12/2004, Bruce Evans wrote: > > >Try this fix. For the uhci-sio conflict, it should avoid problem (1) > >(please try it with the RF_SHAREABLE flag removed so that if this is > .... > >115200 bps provided the UART is buffered and HZ >= 1000. With > >unbuffered UARTs and HZ = 100, only 4800 bos mostly works. Oops. "4800 bos" should be "600 bps" (a 1-byte fifo drained 100 times per second gives at most 100 cps or 1000 bps; 600 gives a safety margin). > > Note, > When removing the RF_SHAREABLE flag from the patch as applied to the > default src code for RELENG_5, the modem is not usable. RELENG_5 stil has a reasonable default for HZ (100) so the maximum cps wth a 16-byte fifo is 16 * 100 * 10 = 16000. I guess you use the default and don't use a 2400 bps modem that would work with a max of 16000. > With RF_SHAREABLE, > all *seems* to work with the modem, but I dont have any real tests, other > than dialing up and doing a fetch of a large file. Lost characters would be reported as silo overflows. Any protocol with error handling would recover from a few OK. Bruce
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20041210112604.T28756>