problem

[Eddie Kohler]

Hi Tom,

> I have made some kind of emulator in Click that can delay incoming packets. It
> works fine, except for one thing. I must say that I work in userlevel because
> files have to be loaded and I needed several standard C functions that didn't
> work in kernel mode. When I monitor how much the packets are delayed, for most
> of the packets this delay is almost perfect (a few micro seconds). But
> periodically, for example every second there are one or two packets which get 1
> till 2 milli seconds too much delay. I suppose that it is because the processor
> gets other interrupts from other processes. I have already set Click as highest
> priority and all other processes as lowest priority but I see no difference. Is
> there some way to decrease this influence or do I have to be satisfied with
> these results?

Hmm. On the one hand you may have to deal with this. But have you tried
manipulating the parameters in lib/routerthread.cc? If you raised
DRIVER_TASKS_PER_ITER and/or DRIVER_ITER_OS, you would go for longer times
without giving up control. Are you sure there isn't some periodic process
within the Click script itself?

Eddie