[HOWTO]Watch 720p videos on n900 [09.12.2011 VIDEOCALL WORKS] - Page 84 - maemo.org

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maacruz	2012-01-17 , 19:17
Posts: 1,101 \| Thanked: 1,185 times \| Joined on Aug 2008 @ Spain	#831

Originally Posted by freemangordon

Well, CONFIG_NO_HZ=y in KP, I am lost what actually CONFIG_HZ=256 and CONFIG_OMAP_32K_TIMER_HZ=256 (or 512) is doing.

From Red Hat documentation

3.4. Tickless Kernel
Previously, the Linux kernel periodically interrupted each CPU on a system at a predetermined frequency — 100 Hz, 250 Hz, or 1000 Hz, depending on the platform. The kernel queried the CPU about the processes that it was executing, and used the results for process accounting and load balancing. Known as the timer tick, the kernel performed this interrupt regardless of the power state of the CPU. Therefore, even an idle CPU was responding to up to 1000 of these requests every second. On systems that implemented power saving measures for idle CPUs, the timer tick prevented the CPU from remaining idle long enough for the system to benefit from these power savings.
A tickless kernel replaces the old periodic timer interrupts with on-demand interrupts. Therefore, idle CPUs are allowed to remain idle until a new task is queued for processing, and CPUs that have entered lower power states can remain in these states longer.

So, a tickless kernel is tickless only when the cpu is sleeping so the clock doesn't interrupt the powersaving sleeping state, it uses the clock for scheduling as before when not.

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	dr_frost_dk	2012-01-18 , 01:07
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#832

Sorry to state the obvious, but how do we (kinda kernal noobs) compile a kernel with the 512 setting?

or can we download an already compiled kernel?

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	Gusse	2012-01-18 , 10:43
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I made an additional patch for rx51_defconfig -file and changed frequencies in there (quick and dirty way, I think...). Then added file to debian/patch -directoty and added it to series -file.

I'm counting me too to 'noob' section when comes to kernel topics. More competent developers can tell how it should have been done

(remove .txt from attachement)

EDIT: Attachement updated

Attached Files

rx51_defconfig_HZ_mod.diff.txt (314 Bytes, 125 views)

Last edited by Gusse; 2012-01-18 at 11:49.

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freemangordon	2012-01-18 , 11:29
Posts: 3,074 \| Thanked: 12,964 times \| Joined on Mar 2010 @ Sofia,Bulgaria	#834

Originally Posted by Gusse

I made an additional patch for rx51_defconfig -file and changed frequencies in there (quick and dirty way, I think...). Then added file to debian/patch -directoty and added it to series -file.

I'm counting me too to 'noob' section when comes to kernel topics. More competent developers can tell how it should have been done

(remove .txt from attachement)

Seems like windoze-style line endings, not sure if that is ok.

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	Gusse	2012-01-18 , 11:44
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Originally Posted by freemangordon

Seems like windoze-style line endings, not sure if that is ok.

Damn, I did open it with Windows WordPad before uploading and propably hit the save button... I'll upload a brand new. Thanks!
EDIT: Now the attachement in 2 post back should be OK (without Windows infections

)

Last edited by Gusse; 2012-01-18 at 14:45.

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	dr_frost_dk	2012-01-18 , 13:05
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Originally Posted by Gusse

I made an additional patch for rx51_defconfig -file and changed frequencies in there (quick and dirty way, I think...). Then added file to debian/patch -directoty and added it to series -file.

I'm counting me too to 'noob' section when comes to kernel topics. More competent developers can tell how it should have been done

(remove .txt from attachement)

EDIT: Attachement updated

Really sorry to be the noob again here, but where do i put this/run it?

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vi_	2012-01-18 , 13:14
Posts: 1,680 \| Thanked: 3,685 times \| Joined on Jan 2011	#837

You don't. What has been provided is a 'diff'. That is a file that denotes the changes in a piece of code in order to patch it. What you would need to do is download the diff, use it to patch your source tree then compile a new whatever (in this case kernel). However, the supplied diff has been infected with windos fail and now all the carriage returns at the end of the lines are ballsaxed up (yes windows sucks so much a55 that it cannot even terminate a line in a text file properly).

In short, hold yer horses mate! It will come! There is not even any proof it is a good change yet.

(alternatively, install the maemo SDK and compile the kp50 sources with the parameter denoted in the diff)

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Last edited by vi_; 2012-01-18 at 13:16.

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	dr_frost_dk	2012-01-18 , 21:45
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#838

Thanks to Gusse im also trying the 512hz, and it has improved the recording, 576p now almost gets full frame-rate in viewfinder doing recording. (recording is still spotless)
720p still drops frames, better then before tho.

OC right now LV 500-850

Also on a side note, all programs start faster, multitasking seems to have gotten a boost, also in the way that the N900 dedicates more power to the program being used, makes sense since it now does 512hz vs 128hz so in the same second now it can give 4x more time to processes

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	Estel	2012-01-18 , 23:41
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#839

Just don't get too excited, it may be a placebo effect. As for viewfinder during 720p video recording - AFAIK it *should* drop framers, to not interrupt video itself.

I'm not pretty convinced to this "wake up more often" thing, so I really recommend a little wait - freemangordon is (most likely) going to check if it *really* help video recording, by measurable means, not only "feeling".

/Estel

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freemangordon	2012-01-19 , 06:38
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Originally Posted by dr_frost_dk

Thanks to Gusse im also trying the 512hz, and it has improved the recording, 576p now almost gets full frame-rate in viewfinder doing recording. (recording is still spotless)
720p still drops frames, better then before tho.

OC right now LV 500-850

Also on a side note, all programs start faster, multitasking seems to have gotten a boost, also in the way that the N900 dedicates more power to the program being used, makes sense since it now does 512hz vs 128hz so in the same second now it can give 4x more time to processes

Well, the most important thing is how is the recorded video framerate againt the one with 128Hz kernel. I won't be able to check the things until next week, so you can experiment a little.
But make sure you are using camera-ui from latest CSSU-T

BTW if that modification does not have ill effects on battery life while making device more responsive, it still could be usefull (even if video recording is not affected)