From: "Petr Cervenka" <grugh@domain.hid>
To: xenomai-help <xenomai@xenomai.org>
Subject: [Xenomai-help] Frequency downscaling of new intel CPU
Date: Mon, 26 Sep 2011 09:02:26 +0200 [thread overview]
Message-ID: <20110926090226.9C75AD68@domain.hid> (raw)
Hello.
I recently tried newer computer and I suprusingly realized that it is bigger load than the old one with our xenomai application.
The problem is in the frequency downscaling of the processor when the load in under 100%.
Of course I have disabled CPU_FREQ, ACPI_PROCESSOR and INTEL_IDLE as suggested.
Later I tried also to disable CPU_IDLE, 7300_IDLE (intel chipset idle memory) and all power efficiency settings in the BIOS, but without success.
The experienced behaviour is following:
when the process is waiting for an event, the processor lowers its frequency and when the event happens it tries to restore (slowly) its nominal frequency.
Do you have any advice or tip what to try, because I'm really desperate?
Best regards
Petr Cervenka
configuration:
Xeon E3-1220 (Sandy Bridge)
linux-2.6.38.8
xenomai-2.5.6
next reply other threads:[~2011-09-26 7:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-26 7:02 Petr Cervenka [this message]
2011-10-03 8:39 ` [Xenomai-help] Frequency downscaling of new intel CPU Petr Cervenka
2011-10-03 8:47 ` Eric Noulard
2011-10-03 16:13 ` Petr Červenka
2011-10-04 7:10 ` Petr Cervenka
2011-10-04 7:39 ` Eric Noulard
2011-10-03 8:48 ` Julien Delange
2011-10-04 10:53 ` Gilles Chanteperdrix
2011-10-05 13:01 ` Petr Cervenka
2011-10-05 13:21 ` Gilles Chanteperdrix
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