[crossbow-discuss] flow properties

[venugopal iyer]

On Thu, 24 Jan 2008, David Edmondson wrote:

> In looking at the flowadm.1m manual page (from npt.sfbay) we see:
>
> FLOW PROPERTIES
>
>     The following flow properties are supported. Note  that
>     the ability to set a given property to a given value depends
>     on the driver and hardware.
>
>
>     maxbw   Sets the full duplex bandwidth for the link. The
>             bandwidth is specified as an integer with one of the
>             scale suffixes(K, M, or G for Kbps, Mbps, and Gbps).
>
>     priority
>             Sets the relative priority for the  link. The value may
>             be given as one of the tokens  rt(real time), high,
>             normal,
>             or low.
>
>     cpus    Bind the processing of packets for a given flow to
>             a processor or a set of processors. The value can be
>             a comma separated list of one or more processor id.
>             If the list consists of more than one processor,
>             the processing will spread out to all the processors
>             although connection to processor affinity and packet
>             ordering for packets of any individual connection will
>             be maintained.
>
>             The processor or set of processors are not exclusively
>             reserved  for the network device. Only the kernel
>             threads and interrupt  associated with processing of
>             the device are bound to the processor or the set of
>             processor specified. In case, it is desired that
>             processors be dedicated to the device, psrset(1M) can
>             be used to create a processor_set and then
>             specifiying the processors from  the processor_set to
>             bind the device to.
>
>             If the link was already bound to processor or set
>             of processors  due to a previous operation, the binding
>             will be removed and the  new set of processors will be
>             used instead.
>
> Shouldn't the word 'link' be replaced with 'flow' in most (all?)
> cases?

Yes.

>
> I'm only really interested in setting properties on flows that
> represent a whole link (there's no need to partition the traffic). The
> flowadm syntax appears to require that I provide some attributes. Is
> that correct?

Yes. I am not sure I understand "flows that represent a whole link". You
don't want to assign the property to the link itself?

-venu

>
> dme.
> -- 
> David Edmondson, Sun Microsystems, http://dme.org
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