On Sep 8, 2005, at 10:42, Bogdan Costescu wrote:
On Thu, 8 Sep 2005, Tommy Christensen wrote:
Personally, I'd prefer the delay to be < 10 seconds.
If you sample every 60 seconds ? Teach Shannon how to do it ;-)
If you mean to reduce the sampling period, there is a very good
reason not to do it: these MDIO operations are expensive - it's a
serial protocol. vortex_timer() might do 2 (and with the discussed
change - 3) of them - there are better things to do for the CPU
than wait for these I/O operations. Plus, vortex_timer() also
disables the interrupt...
The Tornado and at least some Cyclone chips support generating an
interrupt whenever the link changes, which can be used instead of
polling for link state. This feature is not used in the 3c59x
driver and could give you much less than 10 seconds accuracy - but
you have to code it. ;-)
The new PHY Layer (drivers/net/phy/*) can provide all these features
for you without much difficulty, I suspect. The layer supports
handling the interrupts for you, or (if it's shared with your
controller's interrupt) provides simple hooks to make supporting
interrupts easy.
Is the cost of an extra read every minute really too high? It's such
a small fraction of the CPU time, and provides a better user experience.
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