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Benchmarking The Ubuntu "Low-Jitter" Linux Kernel

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  • Kano why the hell are you babbling on? I know very well how much cpu I need. and 4x1.8ghz is BY FAR enough.

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    • http://www.intel.com/content/www/us/...-i-o-demo.html

      Wow, reduced latency AND throughput. I mean someones mind is exploding soon, with bloated red cheeks. And orgasm of idiocy and fuckwitism. Next year they repeat it all at remote location, with lots of outhouses.

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      • Soon they are gonna go like this: http://www.youtube.com/watch?v=BYZmrtWjr9g

        Peace Be With You.

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        • You must really think that Xeon cpus are different than i7. For your purpose, get i5-3570K, GTX 660/670, 8 GB ram (or 16 as it is cheap anyway). I use i7-3770S, but i did not buy it, if i would need to pay for it it then would have been the i5-3570K or i7-3770K. S is really stupid for oc tests.

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          • Kano??? LOL. He is a joke as much as the others. "For my purpose" - did you even notice the topic of this thead? PS: "LOW JITTER".

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            • Kano, fess up. It was you.

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              • Have you seeneth him, whom playeth pacman?
                And alleges you of jinxeth it.
                He doth indeed hate low-jitter, and thinketh the blackmagic makes pac go the wrong way.

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                • THE PARADOX of death takes all/whatever. And luckily discussions like these. Nothing will remain, but nothing will be lost. Gods words never run out. And hopefully the local dealer can get their a** in gear, so I can get my low-jitter COMPUTER. Which again will ofcourse require a low-jitter kernel for maximal effect.
                  Last edited by Paradox Uncreated; 10-29-2012, 09:28 AM.

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                  • No more bitching? And I who hoped you were going to uphold this for atleast 10 more years, into dementia and hellfire itself. Remember human values is not what satan wants. Never admit.

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                    • Seems to be some posts that are disappearing? I can`t believe atleast 4-5 people are deleting their posts? I got this notification now: "I know what jitter is in electronics but kernels?" ?

                      Jitter in electronics is really the same thing. It`s timing jitter, division of clocks, waiting for delivery of signal. Ultimately the hardware sets the minmal jitter limit. Usually software systems, interrupt the software, with interrupts (drivers etc), preemption (context switching between multiple apps), daemons (mailcheckers, automounters, whatever) etc. And all this ultimately leads to clock-jitter on the overall system, which usually is called "Os-jiiter".

                      Peace Be With You.

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                      • This article measured jitter in the most false way possible. Maybe this is a better approach?

                        Frame latency analysis on Doom 3

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                        • Yes, then we have even seen numbers on low-jitter.

                          Summing up:

                          First of all, a kernel with "low latency desktop" enabled. You can edit Kconfig.hz and change 100 to 90. (search/replace).
                          You can add idle=poll and tick_skew=1 to boot options. And compile a shaved local kernel by doing "make localmodconfig" from a full distro kernel. (Also remember to turn of high_res_timers if enabled, because then hz will be 4016 or atleast high.)

                          CFS granularity should be set to 1158500nS. (Current setting is a bit high, and may give jitter)
                          Renice X to -20, to prevent X being a bottleneck.
                          Remove 60hz limit in doom 3, to avoid timing jitter. http://paradoxuncreated.com/tmp/AutoExec.cfg

                          Some nvidia-specific stuff on my blog aswell : http://paradoxuncreated.com/Blog/wordpress/?p=2268

                          A lot of people think SLAB has lower jitter than SLUB etc, aswell, and some tuning with regards to what kernel options execute the least code, least background activity can be done.

                          And then run your apps you want low-jitter in, reniced to -20. (doom 3, chromium-browser, wine (needs wine* + winappname*)

                          Praised Be God!

                          Peace Be With You.

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                          • Perfect.

                            So as I said, I ordered a computer with components optimized for latency. An E5 workstation, which I installed a GTX660 in also. HexaCore. What can I say, I am very pleased with the results. This is the kind of computer I have wanted for a long time. Highly recommened for all low-jitter enthusiasts, and media professionals. Even windows (xp) runs 1ms streams now, with webcam recording at the same time, without drop of frames or clicks.

                            Peace Be With You.

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