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xen-devel
Re: [Xen-devel] cpuidle causing Dom0 soft lockups
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To: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] cpuidle causing Dom0 soft lockups |
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From: |
Juergen Gross <juergen.gross@xxxxxxxxxxxxxx> |
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Date: |
Wed, 03 Feb 2010 13:18:51 +0100 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Wed, 03 Feb 2010 04:19:13 -0800 |
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v=1; a=rsa-sha256; c=simple/simple; d=ts.fujitsu.com; i=juergen.gross@xxxxxxxxxxxxxx; q=dns/txt; s=s1536b; t=1265199642; x=1296735642; h=from:sender:reply-to:subject:date:message-id:to:cc: mime-version:content-transfer-encoding:content-id: content-description:resent-date:resent-from:resent-sender: resent-to:resent-cc:resent-message-id:in-reply-to: references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:list-owner:list-archive; z=From:=20Juergen=20Gross=20<juergen.gross@xxxxxxxxxxxxxx> |Subject:=20Re:=20[Xen-devel]=20cpuidle=20causing=20Dom0 =20soft=20lockups|Date:=20Wed,=2003=20Feb=202010=2013:18: 51=20+0100|Message-ID:=20<4B6969AB.60605@xxxxxxxxxxxxxx> |To:=20"Tian,=20Kevin"=20<kevin.tian@xxxxxxxxx>|CC:=20Jan =20Beulich=20<JBeulich@xxxxxxxxxx>,=20"Yu,=20Ke"=20<ke.yu @intel.com>,=20=0D=0A=20"xen-devel@xxxxxxxxxxxxxxxxxxx" =20<xen-devel@xxxxxxxxxxxxxxxxxxx>,=0D=0A=20Keir=20Fraser =20<keir.fraser@xxxxxxxxxxxxx>|MIME-Version:=201.0 |Content-Transfer-Encoding:=208bit|In-Reply-To:=20<73BDC2 BA3DA0BD47BAAEE12383D407EF35C2F436@xxxxxxxxxxxxxxxxxxxxxx tel.com>|References:=20<4B58402E020000780002B3FE@xxxxxxxx novell.com>=09<C77DE51B.6F89%keir.fraser@xxxxxxxxxxxxx> =09<4B67E85E020000780002D1A0@xxxxxxxxxxxxxxxxxx>=09<8B81F ACE836F9248894A7844CC0BA814250B6A12F0@xxxxxxxxxxxxxxxxxxx .intel.com>=09<4B695ADB020000780002D70F@xxxxxxxxxxxxxxxxx m>=20<73BDC2BA3DA0BD47BAAEE12383D407EF35C2F436@shzsmsx502 .ccr.corp.intel.com>; bh=sdJXMFNgTIzfwEcjOFKA9Vt0QpFlFgctiVKz8U/2SaM=; b=s5ONpYFPDLtmy+wtQjUqj6IkuiCvV/T3F6DmV/hde8A+HHVwldDMG1VF 1A7T8kauFhru+jtkrEj+u0X86/a5lCH/t7izgT07e/jOdc1MDaRO4hrG+ KUO4qvR3lvTiGZrm+ylJfPm595RNy/GOgVDK2NBiDLkjme4t0MoQ7o4AJ ZYu1yiGIUTEoHrWacIt3WNcqjEJlZd2akqbG3L/alpl2M3ZpswArglmeu CXRBJ1/fiuPyI2CdFbHYBzjTdTF5P; |
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Tian, Kevin wrote:
>> From: Jan Beulich
>> Sent: 2010年2月3日 18:16
>>
>>>>> "Yu, Ke" <ke.yu@xxxxxxxxx> 02.02.10 18:07 >>>
>>>> Just fyi, we now also have seen an issue on a 24-CPU system that went
>>>> away with cpuidle=0 (and static analysis of the hang hinted in that
>>>> direction). All I can judge so far is that this likely has
>> something to do
>>>> with our kernel's intensive use of the poll hypercall (i.e.
>> we see vCPU-s
>>>> not waking up from the call despite there being pending unmasked or
>>>> polled for events).
>>> We just identified the cause of this issue, and is trying to
>> find appropriate way to fix it.
>>
>> Hmm, while I agree that the scenario you describe can be a problem, I
>> don't think it can explain the behavior on the 24-CPU system pointed
>> out above, nor the one Juergen Gross pointed out yesterday.
>
> Is 24-CPU system observed with same likelihood as 64-CPU system to
> hang at boot time, or less frequent? Ke just did some theoretical analysis
> by assuming some values. There could be other factors added to latency
> and each system may have different characteristics too. We can't
> draw conclusion whether smaller system will face same issue, by simply
> changing CPU number in Ke's formula. :-) Possibly you can provide cpuidle
> information on your 24-core system for further comparison.
My 4-core system hangs _always_. For minutes. If I press any key on the
console it will resume booting with soft lockup messages (all cpus were
in xen_safe_halt).
Sometimes another hang occurs, sometimes the system will come up without
further hangs.
Juergen
--
Juergen Gross Principal Developer Operating Systems
TSP ES&S SWE OS6 Telephone: +49 (0) 89 3222 2967
Fujitsu Technolgy Solutions e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28 Internet: ts.fujitsu.com
D-80807 Muenchen Company details: ts.fujitsu.com/imprint.html
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