trevor@trevan.uucp (Trevor J. Harris) (09/24/89)
Is anybody runing a Telibit Trailblazer at 19200 on V/AT 2.4. I am not sure if the Microport drivers will support that speed so I was thinking about using the async driver posted to the net recently. I would be grateful for any advice regards trevor -- ------------------------------------------------------------------------- Trevor J. Harris ukc!trevan!trevor
john@wa3wbu.UUCP (John Gayman) (09/25/89)
In article <1989Sep24.135744.5857@trevan.uucp>, trevor@trevan.uucp (Trevor J. Harris) writes: > Is anybody runing a Telibit Trailblazer at 19200 on V/AT 2.4. > I am not sure if the Microport drivers will support that speed so I was > thinking about using the async driver posted to the net recently. > I would be grateful for any advice > When I was still running V/AT 2.4 and 2.3 on a 8Mhz box, I could not get satisfactory results from 19.2K. Keep in mind I dont even think the standard uucp will support that speed. After upgrading to HDB at least I could configure the port but modem operation was *very* irratic if operable at all. I ran 9600 which worked like a charm. Even after I upgraded to a 16 Mhz 386 and installed V/386 I still was not satisfied with 19.2K. I could communicate with the modem and even get a uucp running. But if I did any other serial or console activity on the machine, the modem would stop and then start again. Overall throughput was terrible. Again, I am running now 9600 and it works very smoothly. I can have a 9600 baud News feed coming in at the same time I have two 1200 baud RF-modems running and all is well. I might point out Im using a Digiboard 8-port non-intelligent serial board. Your mileage may vary. John -- John Gayman, WA3WBU | UUCP: uunet!wa3wbu!john 1869 Valley Rd. | ARPA: john@wa3wbu.uu.net Marysville, PA 17053 | Packet: WA3WBU @ AK3P
rd@tarpit.UUCP (Bob Thrush) (09/29/89)
In article <1989Sep24.135744.5857@trevan.uucp> trevor@trevan.uucp (Trevor J. Harris) writes: >Is anybody runing a Telibit Trailblazer at 19200 on V/AT 2.4. >I am not sure if the Microport drivers will support that speed so I was >thinking about using the async driver posted to the net recently. >I would be grateful for any advice I'm running V/AT 2.4, a TB+ at 19.2 kb, and HDB. I would offer the following suggestions/recommendations: 1. If you haven't already done so, replace the 16450 UARTs with 16550's. 2. Replace the Microport serial driver with the Murray driver. (It automatically detects the 16550 and uses the fifos.) 3. Setup the TB to use hardware handshake (the Microport driver does *not* support this.) s58=2, s68=255 is what I use. The 16550 UART has a 16 byte receive and transmit fifo which the Murray driver detects and uses. On the receive side, this results in a significant reduction of the no. of interrupts serviced (from one per character to one per 14 characters). It also reduces (in my case eliminates) character overruns. On the transmit side, each time the output fifo is emptied an interrupt is generated and, at interrupt time, the fifo (16 chars) is refilled. This results in fewer interrupts thereby reducing the interrupt load on the rest of the system. There was a cosmetic change I made to the driver to define open_device() and close_device() static to match an earlier declaration. I also changed the Makefile to additionally rm /dev/ttym[01] and chmod 666 /dev/tty[01] and chmod 622 /dev/ttyM[01]. This system is running a 10 Mhz 0ws 286 and is able (with no other processes) to receive at peak rates of >1400 cps with an overall average of about 1100-1200 cps. The average modem traffic (for August) was ~20 Mb a day with a TB+ and a Hayes SM2400. > regards trevor >-- >------------------------------------------------------------------------- >Trevor J. Harris ukc!trevan!trevor -- Bob Thrush rd@aii.com or uunet!tarpit!rd Automation Intelligence,Inc.,1200 W. Colonial Drive, Orlando, FL 32804