linux-kernel - Re: [BISECTED] 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (HPET)

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Message-ID: <87eid282pj.fsf@spindle.srvr.nix>
Date:	Fri, 10 Sep 2010 08:42:00 +0100
From:	Nix <nix@...eri.org.uk>
To:	Artur Skawina <art.08.09@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Damien Wyart <damien.wyart@...e.fr>,
	John Drescher <drescherjm@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [BISECTED] 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (HPET)

On 10 Sep 2010, Artur Skawina spake thusly:
> I'm seeing this too, except here it happens every couple of days of uptime,
> lasts for a few minutes, and then goes away. Which made bisecting a bit
> impractical... Thank you for doing it. 

I just happened to be the lucky sod for whom it was consistently going
wrong. :)

> HW is similar; x64 and X58/82801JI/ICH10, tsc clocksrc.
> Did that printk trigger?

No.

(hm, odd.

spindle:~# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc

spindle:~# grep -i tsc /proc/timer_list
spindle:~# grep -i hpet /proc/timer_list
Clock Event Device: hpet
 set_next_event: hpet_legacy_next_event
 set_mode:       hpet_legacy_set_mode

I suspect current_clocksource doesn't do what we think it does, or the
clocksource and 'clock event device' are not the same.)
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