[Click] About dynamic polling

[Beyers Cronje]

That's the nature of a polling driver, it continually polls for packets. If
the 100% utilization is such an issue for you then use FromDevice instead of
PollDevice.

Alternatively, a couple of years ago Joonwoo released a patch on the list to
enable NAPI support for PollDevice, see
http://permalink.gmane.org/gmane.network.routing.click/4405

<http://permalink.gmane.org/gmane.network.routing.click/4405>These patches
can also be downloaded at the bottom of page
http://permalink.gmane.org/gmane.network.routing.click/4411

<http://permalink.gmane.org/gmane.network.routing.click/4411>Not sure how
valid these patches still are. Joonwoo, if you are reading this care to
comment?

Beyers

On Wed, Apr 13, 2011 at 6:29 PM, shule ney <neyshule at gmail.com> wrote:

> Ok, but once I start kernel click, it's always 100%, this should not be the
> case that other tasks take the whole CPU.
>
> 2011/4/13 Adam Greenhalgh <a.greenhalgh at cs.ucl.ac.uk>
>
> > But if click is only running as part of the kernel idle loop it
> > shouldn't matter if the incoming packet rate is low , the CPU should
> > switch to undertake what ever tasks are being demanded of it leaving
> > click to run when it isn't doing anything else.
> >
> > adam
> >
> > On 13 April 2011 17:06, shule ney <neyshule at gmail.com> wrote:
> > > What I'm thinking about is when the incoming packet rate is low, high
> > rate
> > > polling is not needed and you can make use of CPU to do other tasks,
> > while
> > > if you are always 100%, it's not possible.
> > >
> > > 2011/4/13 Adam Greenhalgh <a.greenhalgh at cs.ucl.ac.uk>
> > >>
> > >> Unless I'm wrong, the click router exploits the idle cycles of the
> > >> kernel to undertake its polling and other tasks. So unless you are
> > >> wanting to undertake power management, why are you worried about the
> > >> CPU being at 100% if click is just filling the idle tasks ? I am sure
> > >> Eddie or someone else will correct me if I am wrong.
> > >>
> > >> adam
> > >>
> > >> On 13 April 2011 16:40, shule ney <neyshule at gmail.com> wrote:
> > >> > Hi all:
> > >> > I'm using intel 8254 family NIC, now I want to make the polling
> > >> > mechanism dynamically(now it's constant rate polling and CPU usage
> is
> > >> > always
> > >> > 100%), is there any suitable patch for my setups? Thanks very much
> to
> > >> > reply.
> > >> > _______________________________________________
> > >> > click mailing list
> > >> > click at amsterdam.lcs.mit.edu
> > >> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> > >> >
> > >
> > >
> >
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