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Re: [RFC] ATH9K: infinite loop in Tasklet

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On 2 January 2013 09:15, voncken <cedric.voncken@xxxxxxxxx> wrote:
>         Yes,
>
>         I used an mpc8314 at 400Mhz, with 128 Mbit of RAM for my test.

Ah!

>         To find it, I measured the time elapsing in ath_rxbuf_alloc(..) with
> the kernel function local_clock().
>
>         With SLOB I found around 123 us (and I have an infinite loop in
> ath9k tasklet, because when I have consumed one packet the next packet is
> ready to rx process)
>         With SLAB I found around 22 us
>         With SLUB I found around 10 us

Cool. That's significantly more CPU.. :-)

So yes, the right thing to do here is to break out after a limit is
reached, and if we hit that limit, re-schedule that tasklet to run.


Adrian
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