Re: Kern.hz= +1 hertz at anything 2500 and above.

From: Wojciech Puchar <wojtek_at_wojtek.tensor.gdynia.pl>
Date: Thu, 25 Jul 2013 11:51:02 +0200 (CEST)
> improved with a higher kern.hz rating. Unless the future holds an emu20k2,
> there will be RAM used from the motherboard.
> 1. I will need a real-time or a faster kernel- hence the high rate wanted-
> because the devices to be built will be used in an active environment: art,
> music, audio control.
> 2. Any system with limited memory and a low CPU hertz rate benefits from
> the higher kern.hz setting.

rather opposite. more kern.hz=more interrupts.

> 3. Why not? If it works for PowerPC, SPARC64, AMD64, and i386 then it may
> work for other architectures.
> 4. Some applications may be ran from within a jail.
>
>
> On Wed, Jul 24, 2013 at 8:16 PM, Adrian Chadd <adrian_at_freebsd.org> wrote:
>
>> Well, why is it reducing latency? That's the thing you should investigate.
>>
>> Is it because processes aren't getting enough time? or too much time?
>> Or the audio device isn't getting enough time to run? etc.
>>
>>
>>
>> -adrian
>>
>> On 24 July 2013 15:35, Super Bisquit <superbisquit_at_gmail.com> wrote:
>>>
>> http://lists.freebsd.org/pipermail/freebsd-stable/2009-September/051789.html
>>>
>>> This is the thread that  I was referring to earlier. Since the patch is
>> for
>>> 2009, what are the chances it would work with 10.x or 9.x?
>>>
>>> On PowerPC machines with a low MHz rate- or any machine with a CPU rate
>> of
>>> 800 MHz or less- increasing the kern.hz improves performance and cuts
>> down
>>> on latency.  I am building audio applications and suites that are used in
>>> different projects.  A G3 based machine should be able to run a kernel
>> with
>>> kern.hz=5000 with no problem. Unfortunately, this cannot be done.
>>>
>>> _at_PowerPC: some of you may find that performance does increase at a higher
>>> kern.hz rate.
>>>
>>> _at_Hackers & Current: What's the chance that the default rate limit can be
>>> raised to 5k?
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>>
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>
Received on Thu Jul 25 2013 - 08:13:20 UTC

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