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SteamOS beta "Alchemist" arrives

SteamOS beta "Alchemist" arrives

Posted Dec 20, 2013 8:17 UTC (Fri) by boucman2 (subscriber, #81743)
In reply to: SteamOS beta "Alchemist" arrives by jezuch
Parent article: SteamOS beta "Alchemist" arrives

there is a bit of misunderstanding on what exactly is real-time here...

real-time is only about guarenteed response time on the kernel level. it won't change the frame rate unless the whole graphic stack is made realtime... and afaik X.org is not. So I wouldn't expect any real gain here...

which again asks the question "why the realtime patch"

it's not a bad thing per-se, and the patch is used in some very demanding situations so it's already heavily tested... but why ?


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SteamOS beta "Alchemist" arrives

Posted Dec 20, 2013 13:24 UTC (Fri) by mjg59 (subscriber, #23239) [Link]

The real-time patch is present in the source package because Debian build both real-time and vanilla versions of the kernel. The SteamOS binary package contains the vanilla kernel, not the real-time one.

SteamOS beta "Alchemist" arrives

Posted Dec 24, 2013 1:21 UTC (Tue) by gabrbedd (guest, #90145) [Link]

It's audio and haptics that stand to benefit the most from an RT-patch kernel, not video. While the difference between a 1ms and 8ms response will be nil as far as video is concerned... it's not unreasonable that some people will hear/feel the difference.

Also, in practice the scheduler for the RT-patch kernel is a little more reliable for SCHED_FIFO threads/processes. This allows them to run smaller rendering buffers without fear that the buffer will under-run because they didn't get scheduled at the right time.

You can get "good" results with a vanilla kernel (in practice, around 20ms). With an RT-patch you can potentially get "better." Most probably won't notice the difference, but some might.


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