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Message-ID: <1b270aae0609110449m2f71495cna78a6cb17e7ca649@mail.gmail.com>
Date: Mon, 11 Sep 2006 13:49:57 +0200
From: "Metathronius Galabant" <m.galabant@googlemail.com>
To: "Pavel Machek" <pavel@suse.cz>
Subject: Re: top displaying 50% si time and 50% idle on idle machine
Cc: "Andrew Morton" <akpm@osdl.org>, linux-kernel@vger.kernel.org
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	 <1b270aae0609081403u11b76ae9v72ad933475a2319f@mail.gmail.com>
	 <20060908224752.GK8793@ucw.cz>
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> >>>>Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 50.0% id,  0.0%
> >>>>wa,  0.0% hi, 50.0%si
>
> >> BTW what means si? (interrupt service time? google
> >> didn't find anything)
>
> > 'soft interrupt' probably. try disconnecting network.
>
> The cause has been found. The timer of that machine is seriously
> broken, 1 second is approximately 500ms long.
> It is a HP DL360 G4 and I configured the kernel without ACPI or
> similar. Maybe there are some strange BIOS power management schemes
> active. I will look deeper into the problem and report back.
> A broken timer is _very_ strange to me (I didn't encounter that in the
> last 12 years w/ custom kernels).

Power management was completely switched off, so that was not the cause.
Instead, please have a look the this dmesg outputs:

not working (no ACPI):

ENABLING IO-APIC IRQs
unknown bus type 32. (repeated MULTIPLE TIMES!)
..TIMER: vector=0x31 apic1=-1 pin1=-1 apic2=-1 pin2=-1
...trying to set up timer (IRQ0) through the 8259A ...  failed.
...trying to set up timer as Virtual Wire IRQ... works.


working (ACPI + processor support):

ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1

Can this be considered as a kernel-bug?

Thanks for the help,
M.
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