[usb] Suspend -- Performance Analysis

["Srikanth K S" <skashyap@tataelxsi.co.in>]

Hi Vikas,
Thanx 4 the compliments!!!
Have u explored the use of selective suspend/resume to a certain port of a hub (Section11.9, Suspend and Resume)?
This feature may be used to manage resume activity on the bus to yield the desired performance objective.
I only suggest that we have to do a performance analysis of the system at hand b4 we decide on the methodology of using the
select feature "port suspend" command supported by HCD.
Regards,
Srikanth
====================================
But I don't have to know an answer. I don't feel
frightened by not knowing things, by being lost in  the
mysterious universe without having any purpose, which
is the way it really is, as far as I can tell, possibly.
It doesn't frighten me.
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Vikas T Rao wrote:

> ** Proprietary **
>
> hi srikanth,
>
> nice to see ur detailed mail.
>
> let the bus be idle and all the devices are in their suspended state. suppose the host wants to talk to a particular device, then it will be waking all the devices. till the bus goes into idle state again, all other devices will be in their active state only. even though the other devices are not expected to respond, they will be unnecessarily consuming more power. if the devices are all bus powered, then the power at the host/hub will be used inefficiently.
>
> is this the limitation of USB or any misinterpretation by me?
>
> can u clear my thoughts.
>
> regards,
> vikas.

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