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<blockquote data-quote="tourettes" data-source="post: 656334" data-attributes="member: 10858">The problem is not the inaccurate timers itself, those could be firing of on good accuracy - but the issue comes from the thread scheduling. It wont help if the timer fires when OS kernel doesn't allow the thread to be working. This is why MMCSS was added in Vista. It will allow thread priority to be boosted when there is timing critical work to be done - <a href="http://msdn.microsoft.com/en-us/library/ms684247%28VS.85%29.aspx" target="_blank">Multimedia Class Scheduler Service (Windows)</a>At least on the audio renderer side there was / is huge difference how accurate the thread wakeup times are when MMCSS was enabled.Probably that same (or much better) accuracy would be gained if MMCSS would be used for the scheduling thread (and maybe for other threads as well). I would say that adding the 2nd timer is not going to help that much since all is just being limited by the OS thread scheduling - as written earlier the timers itself aren't inaccurate.I'll do some small experimenting with the MMCSS off/on with the audio renderer and post the timer / thread wakeup accuracy data.Indeed <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" /></blockquote>

[QUOTE="tourettes, post: 656334, member: 10858"] The problem is not the inaccurate timers itself, those could be firing of on good accuracy - but the issue comes from the thread scheduling. It wont help if the timer fires when OS kernel doesn't allow the thread to be working. This is why MMCSS was added in Vista. It will allow thread priority to be boosted when there is timing critical work to be done - [url=http://msdn.microsoft.com/en-us/library/ms684247%28VS.85%29.aspx]Multimedia Class Scheduler Service (Windows)[/url] At least on the audio renderer side there was / is huge difference how accurate the thread wakeup times are when MMCSS was enabled. Probably that same (or much better) accuracy would be gained if MMCSS would be used for the scheduling thread (and maybe for other threads as well). I would say that adding the 2nd timer is not going to help that much since all is just being limited by the OS thread scheduling - as written earlier the timers itself aren't inaccurate. I'll do some small experimenting with the MMCSS off/on with the audio renderer and post the timer / thread wakeup accuracy data. Indeed :P [/QUOTE]

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