Subject: Re: [regression 4.14rc] 74def747bcd0 (genirq: Restrict effective
 affinity to interrupts actually using it)
To: Yanko Kaneti <yaneti@declera.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
References: <1505833936.2634.11.camel@declera.com>
From: Marc Zyngier <marc.zyngier@arm.com>
Organization: ARM Ltd
Message-ID: <4374f6c0-dd67-3bd3-91a0-685eb9a0d711@arm.com>
Date: Tue, 19 Sep 2017 16:33:03 +0100
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On 19/09/17 16:12, Yanko Kaneti wrote:
> Hello, 
> 
> Fedora rawhide config here. 
> AMD FX-8370E
> 
> Bisected a problem to:
> 74def747bcd0 (genirq: Restrict effective affinity to interrupts actually using it) 
> 
> It seems to be causing stalls, short lived or long lived lockups very shortly after boot. 
> Everything becomes jerky.
> 
> The only visible in the log indication is something like :
> ....
> [   59.802129] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large:
> [   59.802134] clocksource:                       'hpet' wd_now: 3326e7aa wd_last: 329956f8 mask: ffffffff
> [   59.802137] clocksource:                       'tsc' cs_now: 423662bc6f cs_last: 41dfc91650 mask: ffffffffffffffff
> [   59.802140] tsc: Marking TSC unstable due to clocksource watchdog
> [   59.802158] TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'.
> [   59.802161] sched_clock: Marking unstable (59802142067, 15510)<-(59920871789, -118714277)
> [   60.015604] clocksource: Switched to clocksource hpet
> [   89.015994] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 209.660 msecs
> [   89.016003] perf: interrupt took too long (1638003 > 2500), lowering kernel.perf_event_max_sample_rate to 1000
> ....
> 
> Just reverting that commit on top of linus mainline cures all the symptoms
Interesting. Do you still get HPET interrupts?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...