Author Topic: 5600 Preemptive ROM & VNCServer (Read 7729 times)

grey_moon · « **Reply #15 on:** February 27, 2004, 11:25:23 am »

Not too sure if this will help too

http://www.currybrothers.com/zaurus/sl5600...00_patches.html

tumnus · « **Reply #16 on:** February 27, 2004, 12:00:04 pm »

Thanks, but no. The fbvncserver for the Sharp ROM works fine with the standard Sharp kernel. Also it does respond, but as soon as you do anything with the screen it does about 1 screen update and then crashes a Qtopia process. It doesn\'t consume 100% of the CPU, but Qtopia acts like it. Only a reboot seems to sort it out.

tumnus · « **Reply #17 on:** February 28, 2004, 07:06:28 pm »

I\'ve done some more research. Sadly it looks like it is a problem with turning off the XScale cache bug workaround off. I tried VNC server with the standard Sharp kernel and it worked fine. I then tried it with the standard Sharp kernel with the only difference being the XScale cache bug workaround was turned off and it caused the screen to stop updating (And yes I recalibrated the VNC touchscreen settings and recompiled the only VNC kernel module)

Ho hum. In any case I\'ve compiled a new \'Special\' kernel which is not overclocked by default, but the CPU speed can be increased if you want. I have also removed the pre-emptive patch as it gave negligible benefit and broke module compatibility. All standard kernel modules should work fine with this. The XScale cache bug workaround is still turned off to give you the full 400MHz (otherwise there would be no point in this kernel). Apart from this VNC Server problem I do not know of any other problems. It should appear on the page linked below soon, as Special kernel v1.2, and means we don\'t have to maintain two kernels (with and without overclocking) and two sets of modules.

http://www.zaurususergroup.com/modules.php...download&sid=53

w4lna · « **Reply #18 on:** February 28, 2004, 09:46:49 pm »

Quote

The general and special kernel building instructions are in the ZUG howtos.

I have the cross-compiler installed, but can\'t seem to find the kernel source mentioned in the special kernel build instructions. Is there any other places that I can find it?

tumnus · « **Reply #19 on:** February 28, 2004, 09:54:53 pm »

Ignore v1.2 of the Special Kernel when it appears on the download pages as I didn\'t get the module compatibility quite right. Look for v1.3 instead.

As for the kernel source, a quick google turned up this:
http://developer.ezaurus.com/sl_j/source/c...rom1_10.tar.bz2
I guess I\'ll have to update the descriptions.

It would be nice if we could get rid of all the kernels apart from Special Kernel v1.3 (when it is approved) since that is all that should be needed now.

w4lna · « **Reply #20 on:** February 28, 2004, 10:04:13 pm »

Quote

Ignore v1.2 of the Special Kernel when it appears on the download pages as I didn\'t get the module compatibility quite right. Look for v1.3 instead.

As for the kernel source, a quick google turned up this:
http://developer.ezaurus.com/sl_j/source/c...rom1_10.tar.bz2
I guess I\'ll have to update the descriptions.

Thanks, I found it at another site too...

Found a little error in the setup of the Qtopia development enviironment. It should mention copying \"tmake.conf\" *after* the Qtopia environment is installed. Fedora also did not need the extra packages called out for RH9.

grey_moon · « **Reply #21 on:** March 04, 2004, 03:31:18 pm »

What modules does the preemptive patch break please?

tumnus · « **Reply #22 on:** March 04, 2004, 05:49:54 pm »

Lots, that\'s why I took it out.

Anonymous · « **Reply #23 on:** March 04, 2004, 06:35:07 pm »

HI,
So the 1.3 release of special kernel (by default) will fix the pxa250 problems? It will make it equivalent to the pxa255 then?
Also, how would you change the clock speed , is there a dynamic way, and will this cause a problem with the vnc server?
Does this special 1.3 kernel have the wireless extensions built into it?

Thanks and regards.

grey_moon · « **Reply #24 on:** March 04, 2004, 06:42:31 pm »

doh, I guess i\'ll spend tomorrow night redoing my kernel... I have netfilter and routing functionality in mine
one thing... if i dont use the preemtive patch, I\'m guessing that mean si dont need to worry about the bluez patches

cheers
moon

tumnus · « **Reply #25 on:** March 05, 2004, 03:20:13 am »

Quote

So the 1.3 release of special kernel (by default) will fix the pxa250 problems?

Generally speaking, yes.

Quote

It will make it equivalent to the pxa255 then?

Not quite. Same speed, but the PXA255 also includes a few power efficiency improvements.

Quote

Also, how would you change the clock speed , is there a dynamic way, and will this cause a problem with the vnc server?
Does this special 1.3 kernel have the wireless extensions built into it?

Please read the v1.3 Special Kernel description:
http://www.zaurususergroup.com/modules.php...download&sid=53

grey_moon · « **Reply #26 on:** March 06, 2004, 10:06:03 am »

Well I redid my kernel with out the preemptive patch and i got an increase in my drhystone test

***
special kernel with preemptive
Dhrystone Benchmark, Version 2.1 (Language: C)
Register option not selected.
Microseconds for one loop: 2.1
Dhrystones per second: 477463.7
VAX MIPS rating: 271.749

***
special kernel without preemptive
Dhrystone Benchmark, Version 2.1 (Language: C)
Register option not selected.
Microseconds for one loop: 2.1
Dhrystones per second: 479892.5
VAX MIPS rating: 273.132

Notice the increase!
From what i gather premptive reduces the latency of the kernel by preassigning time slices to every process, so I guess a batch task like the dhrystone test would benefit from not having the preemptive patch..
*scratches his head and goes and does some more reading*

Cheers
Moon

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Author Topic: 5600 Preemptive ROM & VNCServer (Read 7729 times)

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