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marmistrz is offline marmistrz
2015-07-20 , 19:26
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#1
According to this link [1], preempt kernel is slower than generic. Why are we building the kernel as preempt? Do we really need low latency?

[1] http://askubuntu.com/questions/12666...-realtime-ones
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reinob is offline reinob
2015-07-21 , 06:29
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#2
Originally Posted by marmistrz View Post
According to this link [1], preempt kernel is slower than generic. Why are we building the kernel as preempt? Do we really need low latency?

[1] http://askubuntu.com/questions/12666...-realtime-ones
It's usually recommended for desktop systems (and mobile fits the definition), as low latency is considered more important than high troughput (on a server you'd have it the other way).
 

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pichlo is offline pichlo
2015-07-21 , 06:56
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#3
Originally Posted by reinob View Post
desktop systems (and mobile fits the definition)
In the (software) company I worked a while ago, we used the word "endpoint" to cover desktops and mobile devices. As opposed to "servers".
 

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reinob is offline reinob
2015-07-21 , 08:46
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#4
Originally Posted by pichlo View Post
In the (software) company I worked a while ago, we used the word "endpoint" to cover desktops and mobile devices. As opposed to "servers".
To me a server is also an endpoint

Where I work, most of the time, they're all a "general-purpose computer", unless they do something really special
 

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marmistrz is offline marmistrz
2015-07-21 , 08:59
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#5
Yep, but the Ubuntu wiki says one should use the generic kernel unless there are reasons to do otherwise.

https://help.ubuntu.com/community/Ub...RealTimeKernel
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pichlo is offline pichlo
2015-07-21 , 09:36
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#6
Originally Posted by marmistrz View Post
https://help.ubuntu.com/community/Ub...RealTimeKernel
From that page:

"If you need a low latency system (e.g. for recording audio) then please use the -preempt kernel as a first choice." [Emphasis mine]

There you go. My N900 records videos with stuttering as it is, even with a PREEMPT, Thumb2 kernel. It sounds like a generic one would make it even worse.
 

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marmistrz is offline marmistrz
2015-07-21 , 09:38
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#7
Yes, indeed, this makes sense

Maybe a lowlatency kernel could alleviate the issues with recording?
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