On 5/11/2005 13:57, Tuomo Latto wrote:
Subhro wrote:
...
In Device Polled systems, the NIC does not generate any interrupt at
all. Instead whenever the packets arrive at a Network interface, they
are captured and put into a queue. The kernel scheduler checks the
quese at regular intervals and processes the packets which are
waiting. This interval is adjusted by the "options HZ=x" kernel option.
If the value of x is very high, there may eb two scenarios. In the
first scenario, the queue may fill up and subsequent packets are
dropped. In this case retransmission of the packets are required. In
the second scenario, the packets would be held up for excessive long
times which defeats the entire purpose of Device Polling. If the
value of x is very low, the scheduler would check the queue
frequently and would again defeat the entire idea of Device Polling.
It's the other way around. Large values indicate larger polling frequency
thus amounting to more checks. Or at least the name of the option would
suggest that anyway.
Silly me :(. I meant something, typed something else. Its indeed the
other way round. Thanks to everyone who pointed this out.
Regards
S.
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