MobileRead Forums - View Single Post - iRex Iliad was not designed for Suspend/Hibernate

Mike Kostousov · 11-01-2006, 10:12 AM

I think that problem with suspend could be unsolvable just if iRex made special hardware which wakes up cpu each 1milisecond. But then iRex needed special conclusion and effort for that.
I also read some papers about PXA255. It is cleary said that processor can have idle state and idle 33mhz state just by it self, without spesial hardware. As I understood, cpu can also have sleep mode, but there must be some hardware which awakes cpu. And, as I saw in /proc, there is no clock scale code for PXA255 in kernel. The good using of power scaling can consume at least half energy.
The question for scotty1024. Can you create some code in ipdf and idjvu which will just measure how much time it uses to render a page, and all cached pages? How much time isn't it doing anything?

11-01-2006, 10:12 AM	#17
Mike Kostousov Connoisseur Posts: 50 Karma: 861 Join Date: Aug 2006 Device: Zaurus C1000/iLiad/SE K750i	I think that problem with suspend could be unsolvable just if iRex made special hardware which wakes up cpu each 1milisecond. But then iRex needed special conclusion and effort for that. I also read some papers about PXA255. It is cleary said that processor can have idle state and idle 33mhz state just by it self, without spesial hardware. As I understood, cpu can also have sleep mode, but there must be some hardware which awakes cpu. And, as I saw in /proc, there is no clock scale code for PXA255 in kernel. The good using of power scaling can consume at least half energy. The question for scotty1024. Can you create some code in ipdf and idjvu which will just measure how much time it uses to render a page, and all cached pages? How much time isn't it doing anything?