From: Uwaysi Bin Kareem <uwaysi.bin.kareem@paradoxuncreated.com>
To: linux-kernel@vger.kernel.org
Subject: The 10ms averager in fair.c
Date: Sun, 30 Sep 2012 13:44:14 +0200 [thread overview]
Message-ID: <op.wlf5j0i76426ze@localhost.localdomain> (raw)
Hiya. I just had an initial look at fair.c
There seems to be a 10ms averager in there?
You are aware that that means you work on delayed values?
Isn`t that counterintuitive to the principle of sharing?
That means short bursts of cpu-use will be filtered out, and given less
cpu time.
Starting applications won`t have their cpu-usage before 5ms, which is
quite a bit on modern machines. Well if you use a linearphase filter, I
don`t know what kind of averager you use. The best would ofcourse be to
use a minimalphase gaussian averager. Which might be overkill. Atleast a
one-pole iir, buf = buf + (-buf + in) * cut)); One pole IIRs also have a
better frequency response.
When you are working with low-latencies, wouldn`t it be better if such
things are tuned for target latency. I think few care about latency after
0.2ms. So say the filter should be set to 0.4ms max.
Why would you want to filter cpu-usage also really?
Peace Be With You.
(please CC me.)
next reply other threads:[~2012-09-30 11:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-30 11:44 Uwaysi Bin Kareem [this message]
2012-09-30 19:18 ` Uwaysi Bin Kareem
[not found] ` <1349064397.6957.26.camel@marge.simpson.net>
2012-10-01 13:24 ` Uwaysi Bin Kareem
[not found] ` <1349146202.7086.23.camel@marge.simpson.net>
2012-10-02 7:04 ` Uwaysi Bin Kareem
2012-10-02 17:25 ` The 10ms averager in fair.c + granularity Uwaysi Bin Kareem
2012-10-03 15:14 ` Uwaysi Bin Kareem
2012-10-04 12:20 ` el es
2012-10-03 20:26 ` Doom 3 perfect on linux Uwaysi Bin Kareem
2012-10-04 10:23 ` RME Fireface UCX in Classcompliant USB-mode, is not working? Uwaysi Bin Kareem
2012-10-05 19:54 ` The 10ms averager in fair.c Uwaysi Bin Kareem
2012-10-02 6:56 ` Uwaysi Bin Kareem
[not found] ` <1349169555.7086.48.camel@marge.simpson.net>
2012-10-02 8:07 ` Uwaysi Bin Kareem
[not found] ` <1349176973.7086.96.camel@marge.simpson.net>
2012-10-02 9:28 ` Uwaysi Bin Kareem
2012-09-30 12:16 Uwaysi Bin Kareem
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