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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: "Thimo E." <abc@digithi.de>
Cc: Keir Fraser <keir@xen.org>, Jan Beulich <JBeulich@suse.com>,
	"Dong, Eddie" <eddie.dong@intel.com>,
	Xen-develList <xen-devel@lists.xen.org>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	"Zhang, Yang Z" <yang.z.zhang@intel.com>,
	"Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: cpuidle and un-eoid interrupts at the local apic
Date: Wed, 4 Sep 2013 21:54:45 +0100	[thread overview]
Message-ID: <52279E15.4070207@citrix.com> (raw)
In-Reply-To: <52279078.3030701@digithi.de>

On 04/09/2013 20:56, Thimo E. wrote:
> Hello Andrew,
>
> thanks for your response. At least I've seen the trigger of the new
> crash (2e) already before, so they seem so belong together.
>
> I can't image that I am the only one on the world who is using a
> haswell board. And as I haven't seen any other Xen bug/crash reports
> like mine (and one time you) nor bug reports from users with other
> operating systems, I ask myself if only my hardware is buggy
> or if other operating systems handle those "spurious" interrupts in
> another way ?!?!
>
> What does " ioapic_ack=old" change ?
>
> Best regards
>   Thimo

ioapic_ack=old is already in effect - see "Enabled directed EOI with
ioapic_ack_old on!" in the boot dmesg.

Originally, it was a bugfix workaround for ancient IO-APIC hardware
which had a bug on one of the mask bits.  Nowadays, it is used with EOI
broadcast suppression, which is a APIC transaction performance
improvement on recent processors.  What it does is affect whether an
IO-APIC interrupt gets masked when an interrupt is received.

You could certainly try "ioapic_ack=new" and see whether that makes a
difference, given a lack of any other ideas.  It will disable EOI
broadcast suppression.

~Andrew

  reply	other threads:[~2013-09-04 20:54 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-31 20:32 cpuidle and un-eoid interrupts at the local apic Andrew Cooper
2013-06-03 14:30 ` Jan Beulich
2013-07-31  8:30 ` Thimo E.
2013-07-31  9:47   ` Andrew Cooper
2013-08-02 22:50     ` Thimo E.
2013-08-02 23:32       ` Andrew Cooper
2013-08-05 12:45         ` Jan Beulich
2013-08-05 14:51           ` Andrew Cooper
2013-08-09 21:27             ` Thimo E.
2013-08-09 21:40               ` Andrew Cooper
2013-08-09 21:44                 ` Andrew Cooper
2013-08-11 17:46                   ` Thimo E.
2013-08-12  6:02                     ` Zhang, Yang Z
2013-08-12  8:49                     ` Zhang, Yang Z
2013-08-12  8:57                       ` Jan Beulich
2013-08-12 11:52                       ` Thimo E
2013-08-12 12:04                         ` Andrew Cooper
2013-08-19 15:14                           ` Thimo E.
2013-08-20  5:43                             ` Thimo Eichstädt
2013-08-20  8:40                               ` Jan Beulich
2013-08-20  8:50                                 ` Zhang, Yang Z
2013-08-23  7:22                                   ` Thimo Eichstädt
2013-08-23  7:30                                     ` Zhang, Yang Z
2013-08-27  1:03                                     ` Zhang, Yang Z
2013-09-04 18:32                                       ` Thimo E.
2013-09-04 18:55                                         ` Andrew Cooper
2013-09-04 19:56                                           ` Thimo E.
2013-09-04 20:54                                             ` Andrew Cooper [this message]
2013-09-05  1:45                                               ` Zhang, Yang Z
2013-09-05  7:20                                                 ` Thimo E.
2013-09-05  1:15                                         ` Zhang, Yang Z
2013-09-17  2:09                                         ` Zhang, Yang Z
2013-09-17  7:39                                           ` Thimo E.
2013-09-17  7:43                                             ` Zhang, Yang Z
2013-09-17 21:04                                               ` Thimo E.
2013-09-18  1:18                                                 ` Zhang, Xiantao
2013-09-18 17:24                                                   ` Thimo E.
2013-09-18 12:06                                                 ` Andrew Cooper
2013-08-12 13:54                       ` Thimo E
2013-08-12 14:06                         ` Andrew Cooper
2013-08-13  1:43                           ` Zhang, Yang Z
2013-08-13  6:39                             ` Thimo E.
2013-08-13 11:39                         ` Wu, Feng
2013-08-13 12:46                           ` Andrew Cooper
2013-08-12  9:10                     ` Andrew Cooper
2013-08-12  5:50                 ` Zhang, Yang Z
2013-08-12  8:20               ` Jan Beulich
2013-08-12  9:28                 ` Andrew Cooper
2013-08-12 10:05                   ` Jan Beulich
2013-08-12 10:27                     ` Andrew Cooper
2013-08-14  2:53                       ` Zhang, Yang Z
2013-08-14  7:51                         ` Thimo E.
2013-08-14  9:52                         ` Andrew Cooper
2013-09-07 13:27                           ` Thimo E.
2013-09-07 17:02                             ` Andrew Cooper
2013-09-07 23:37                               ` Thimo E.
2013-09-08  9:53                                 ` Andrew Cooper
2013-09-08 10:24                                   ` Thimo E.
2013-09-09 13:16                                     ` Andrew Cooper
2013-09-09 14:48                                       ` Thimo Eichstädt
2013-09-09 15:12                                         ` Andrew Cooper
2013-09-09  7:59                               ` Jan Beulich
2013-09-09 12:53                                 ` Andrew Cooper

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