Cc: David P. Reed <dpreed@...>, David Woodhouse <dwmw2@...>, Rene Herman <rene.herman@...>, Zachary Amsden <zach@...>, H. Peter Anvin <hpa@...>, Christer Weinigel <christer@...>, Ondrej Zary <linux@...>, Bodo Eggert <7eggert@...>, Ingo Molnar <mingo@...>, Paul Rolland <rol@...>, Pavel Machek <pavel@...>, Thomas Gleixner <tglx@...>, <linux-kernel@...>, Ingo Molnar <mingo@...>, rol <rol@...>
In the early days of clone PCs, as you know but perhaps many on this
list might not, the bus speed could be changed, but this was
user-selectable. For such a machine, delay values can be pre-calculated
for each bus speed, and a kernel parameter set accordingly. Or are you
saying that the characteristics of the bus on a given machine vary for
reasons other than user selection?
The fact that busses run at different speeds on different machines is
not a problem because the delay value can be determined for each given
machine.
The question is, for a given machine, can we determine a delay value
instead of using a junk I/O?
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