Subject: Re: [linux-audio-dev] 1000HZ ticks for x86 in the 2.5-tree
From: Kai Vehmanen (kai.vehmanen_AT_wakkanet.fi)
Date: Wed Jul 10 2002 - 01:46:06 EEST
On Tue, 9 Jul 2002, Paul Sladen wrote:
>>> RTC is still more accurate, but on the other hand, you don't need root
>>> privileges to take advantage of the 1kHz ticks!
> Kernel space only; userspace is still at 100Hz on x86
Not a problem. Timing sensitive user-space apps benefit from this change
because with 1kHz ticks, kernel will be making scheduling decisions much
more often.
AFAIK, keeping the user-space visible HZ-value as 100Hz is more of a
convenience feature (ie. it's possible to change the kernel HZ value
without the need to recompile glibc and some user-space apps like top). In
other words user-space apps will get full benefit of the higher tick
frequency even though the user-space exported HZ is set to 100.
-- http://www.eca.cx Audio software for Linux!
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