linux-kernel - Re: lockup when C1E and high-resolution timers enabled

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Message-ID: <1434325118.1999.5.camel@googlemail.com>
Date:	Mon, 15 Jun 2015 01:38:38 +0200
From:	Christoph Fritz <chf.fritz@...glemail.com>
To:	Daniel J Blueman <daniel@...ra.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: lockup when C1E and high-resolution timers enabled

On Sun, 2015-06-14 at 23:24 +0800, Daniel J Blueman wrote:
> val=0x$(setpci -s 00:18.3 0xd4.l) # read D18F3xD4
> val=$((val &~(1 << 13))) # clear bit13 (MTC1eEn)
> setpci -d 1022:1603 0xd4.l=$(printf %x $val) # write back

This slows down the whole system dramatically:

 - before: MTC1eEn set: Booting takes 11 secs
 - after : MTC1eEn cleared: Booting takes 53 secs

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