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2 | 3COM PCI TOKEN LINK VELOCITY XL TOKEN RING CARDS README | ||
3 | |||
4 | Release 0.9.0 - Release | ||
5 | Jul 17th 2000 Mike Phillips | ||
6 | |||
7 | 1.2.0 - Final | ||
8 | Feb 17th 2002 Mike Phillips | ||
9 | Updated for submission to the 2.4.x kernel. | ||
10 | |||
11 | Thanks: | ||
12 | Terry Murphy from 3Com for tech docs and support, | ||
13 | Adam D. Ligas for testing the driver. | ||
14 | |||
15 | Note: | ||
16 | This driver will NOT work with the 3C339 Token Ring cards, you need | ||
17 | to use the tms380 driver instead. | ||
18 | |||
19 | Options: | ||
20 | |||
21 | The driver accepts three options: ringspeed, pkt_buf_sz and message_level. | ||
22 | |||
23 | These options can be specified differently for each card found. | ||
24 | |||
25 | ringspeed: Has one of three settings 0 (default), 4 or 16. 0 will | ||
26 | make the card autosense the ringspeed and join at the appropriate speed, | ||
27 | this will be the default option for most people. 4 or 16 allow you to | ||
28 | explicitly force the card to operate at a certain speed. The card will fail | ||
29 | if you try to insert it at the wrong speed. (Although some hubs will allow | ||
30 | this so be *very* careful). The main purpose for explicitly setting the ring | ||
31 | speed is for when the card is first on the ring. In autosense mode, if the card | ||
32 | cannot detect any active monitors on the ring it will open at the same speed as | ||
33 | its last opening. This can be hazardous if this speed does not match the speed | ||
34 | you want the ring to operate at. | ||
35 | |||
36 | pkt_buf_sz: This is this initial receive buffer allocation size. This will | ||
37 | default to 4096 if no value is entered. You may increase performance of the | ||
38 | driver by setting this to a value larger than the network packet size, although | ||
39 | the driver now re-sizes buffers based on MTU settings as well. | ||
40 | |||
41 | message_level: Controls level of messages created by the driver. Defaults to 0: | ||
42 | which only displays start-up and critical messages. Presently any non-zero | ||
43 | value will display all soft messages as well. NB This does not turn | ||
44 | debugging messages on, that must be done by modified the source code. | ||
45 | |||
46 | Variable MTU size: | ||
47 | |||
48 | The driver can handle a MTU size up to either 4500 or 18000 depending upon | ||
49 | ring speed. The driver also changes the size of the receive buffers as part | ||
50 | of the mtu re-sizing, so if you set mtu = 18000, you will need to be able | ||
51 | to allocate 16 * (sk_buff with 18000 buffer size) call it 18500 bytes per ring | ||
52 | position = 296,000 bytes of memory space, plus of course anything | ||
53 | necessary for the tx sk_buff's. Remember this is per card, so if you are | ||
54 | building routers, gateway's etc, you could start to use a lot of memory | ||
55 | real fast. | ||
56 | |||
57 | 2/17/02 Mike Phillips | ||
58 | |||