linux-kernel - Re: top displaying 50% si time and 50% idle on idle machine

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Message-ID: <1b270aae0609110405r183748d2y753c0e846229f1d0@mail.gmail.com>
Date:	Mon, 11 Sep 2006 13:05:41 +0200
From:	"Metathronius Galabant" <m.galabant@...glemail.com>
To:	"Pavel Machek" <pavel@...e.cz>
Cc:	"Andrew Morton" <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: top displaying 50% si time and 50% idle on idle machine

>>>>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).

Cheers,
M.
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