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MarekGibek · 09-27-2013, 03:41 PM

A very simple change (of 1 line of code) in the kernel sources will give you ~15 MB more memory (RAM) on your kobo. The change is:
https://github.com/marek-g/kobo-kern...7d3b4a487ed200

If you are using my image (https://www.mobileread.com/forums/sho...d.php?t=220350) with Firefox it will give you much better web browsing experience.

So what's the price?

The parameter reduces number of video buffers used for concurrent screen updates. eInk controller can update up to 15 screen regions at the same time (if requested). But most of the time large areas are updated and having too many buffers makes no sense if you can trade it for memory.

I was suprised that I couldn't see almost any negative impact after that change. Except less frequent updates of mouse cursor in X11 (which I would like to hide anyway). I even think that overall experience is even better now:

less crazy flickering of motion areas that could trigger multiple refreshes before
less CPU usage

Original kobo firmware works as always (no difference noticed). Having more memory original kobo's web browser will crash later

09-27-2013, 03:41 PM	#1
MarekGibek Zealot Posts: 129 Karma: 34471 Join Date: Aug 2013 Location: Cracow, Poland Device: Kobo Touch N905C	15 MB more memory (RAM) A very simple change (of 1 line of code) in the kernel sources will give you ~15 MB more memory (RAM) on your kobo. The change is: https://github.com/marek-g/kobo-kern...7d3b4a487ed200 If you are using my image (https://www.mobileread.com/forums/sho...d.php?t=220350) with Firefox it will give you much better web browsing experience. So what's the price? The parameter reduces number of video buffers used for concurrent screen updates. eInk controller can update up to 15 screen regions at the same time (if requested). But most of the time large areas are updated and having too many buffers makes no sense if you can trade it for memory. I was suprised that I couldn't see almost any negative impact after that change. Except less frequent updates of mouse cursor in X11 (which I would like to hide anyway). I even think that overall experience is even better now: less crazy flickering of motion areas that could trigger multiple refreshes before less CPU usage Original kobo firmware works as always (no difference noticed). Having more memory original kobo's web browser will crash later Last edited by MarekGibek; 09-27-2013 at 03:45 PM.