发信人: neal()
整理人: (1999-04-22 02:52:40), 站内信件
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274x/294x/394x (或是 AIC7xxx) 的 TAG 必须自行打开, 其他如 NCR
是内定打开.
注意 : 2.1.0-RELEASE 以上才有支援喔, 不过 2.1.5R/2.2-CURRENT
的 2940 driver
比 2.1.0-R 的要稳定.
做法如下 :
1. add "options AHC_TAGENABLE" to kernel config file
(if success to boot, see Step-2.
if failed, you will need 2.2-current)
2. add "options AHC_SCBPAGING_ENABLE" to kernel
config file
This will enable SCB paging, which will extend your SCB
up to
255.
3. reboot
When you see those messages on booting :
ahc0 : target 0 Tagged Queuing Device
That means you have TAG_QUEUEING now !!
Note : if you are running 2.1.0R, that's a bug in SCBS(255)
calculation for
the new 2940 bios, already fixed in 2.2-current. (the real
SCBS is 16)
Q: TAG-QUEUE 有何用途啊 ?? 加大有何好处 ??
A: you can send more than one command to a device at a time.
will be MUCH faster in multi-tasking env.
A: 除了 AIC7xxx 的 driver 以外，还有 NCR driver 也支援 tag，内定启动。
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※ 来源:．网易 BBS bbs.netease.com．[FROM: dmx320.resnet.ust.hk]
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