From: Jan Kiszka <jan.kiszka@domain.hid>
To: Peter Pastor <peter.pastor@domain.hid>, Philippe Gerum <rpm@xenomai.org>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Slow hard drive access in xenomai
Date: Mon, 25 Oct 2010 21:40:15 +0200 [thread overview]
Message-ID: <4CC5DD1F.4090405@domain.hid> (raw)
In-Reply-To: <AANLkTimS7-CEvA74Viwu4mLm9-O_NpakXYG7=FXK1L1f@domain.hid>
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Am 25.10.2010 21:03, Peter Pastor wrote:
> Hey Jan,
>
> I did not apply any ubuntu patch for kernel 2.6.35 (since I do not have
> one). Also, good to know that I should not use xenomai patches together
> with ubuntu patches.
>
> Anyway, the problem occurred as well with the kernel 2.6.35 (see attached
> dmesg_bad_2.6.35)
> I also attached the config.
>
...
> [ 5751.714643] irq 16: nobody cared (try booting with the "irqpoll" option)
> [ 5751.714649] Pid: 0, comm: swapper Tainted: P 2.6.35-ipipe-2.5.4-slim #2
> [ 5751.714653] Call Trace:
> [ 5751.714655] <IRQ> [<ffffffff8108bb56>] __report_bad_irq+0x26/0xa0
> [ 5751.714668] [<ffffffff8108bd5c>] note_interrupt+0x18c/0x1d0
> [ 5751.714672] [<ffffffff8108c77d>] handle_fasteoi_irq+0xcd/0x100
> [ 5751.714677] [<ffffffff8100656d>] handle_irq+0x1d/0x30
> [ 5751.714681] [<ffffffff81005a40>] do_IRQ+0x70/0x100
> [ 5751.714685] [<ffffffff81092147>] __ipipe_sync_stage+0x207/0x20d
> [ 5751.714689] [<ffffffff810059d0>] ? do_IRQ+0x0/0x100
> [ 5751.714692] [<ffffffff8109214d>] ? __xirq_end+0x0/0x9c
> [ 5751.714696] [<ffffffff810059d0>] ? do_IRQ+0x0/0x100
> [ 5751.714700] [<ffffffff810926a3>] __ipipe_walk_pipeline+0x113/0x120
> [ 5751.714706] [<ffffffff81024414>] __ipipe_handle_irq+0x124/0x310
> [ 5751.714708] [<ffffffff8108bf10>] ? __ipipe_ack_fasteoi_irq+0x0/0x10
> [ 5751.714712] [<ffffffff814f78d3>] common_interrupt+0x13/0x2c
> [ 5751.714713] <EOI> [<ffffffff810249d6>] ? __ipipe_halt_root+0x26/0x40
> [ 5751.714718] [<ffffffff81061191>] ? atomic_notifier_call_chain+0x11/0x20
> [ 5751.714722] [<ffffffff8100cbd5>] default_idle+0x45/0x50
> [ 5751.714725] [<ffffffff8100198a>] cpu_idle+0x7a/0xd0
> [ 5751.714728] [<ffffffff814f14a1>] start_secondary+0x1c1/0x1c5
> [ 5751.714730] handlers:
> [ 5751.714730] [<ffffffff8136ed60>] (usb_hcd_irq+0x0/0xb0)
> [ 5751.714735] [<ffffffffa00bac30>] (mpt_interrupt+0x0/0xa00 [mptbase])
> [ 5751.714747] Disabling IRQ #16
I'm not yet sure, but a first thought: We have a shared fasteoi IRQ
here, and we are on SMP. Compared to vanilla, the fasteoi flow of ipipe
looks so much different to me ATM that I tend to believe two cores end
up having this IRQ queued at the same time. One runs first and handles
all triggers, the second bails out like above.
Philippe, we _end_ fasteoi in the ipipe ack path. Do we mask them prior
to this? What prevents a second IRQ arriving after this early eoi?
Jan
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next prev parent reply other threads:[~2010-10-25 19:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-22 21:32 [Xenomai-help] Slow hard drive access in xenomai Peter Pastor
2010-10-22 22:06 ` Gilles Chanteperdrix
2010-10-24 7:19 ` Peter Pastor
2010-10-26 5:22 ` Gilles Chanteperdrix
2010-10-28 19:20 ` Peter Pastor
2010-11-02 12:30 ` Gilles Chanteperdrix
2010-11-02 15:24 ` Peter Pastor
2010-11-02 22:30 ` Gilles Chanteperdrix
[not found] ` <AANLkTimyj5TRgan5nE5ey6h8-WO_-na=U66si-e9Xx9F@mail.gmail.com>
2010-10-24 15:08 ` Gilles Chanteperdrix
2010-10-24 19:51 ` Peter Pastor
2010-10-24 20:40 ` Peter Pastor
2010-10-25 6:19 ` Eric Noulard
2010-10-25 10:47 ` Gilles Chanteperdrix
2010-10-25 11:14 ` Jan Kiszka
2010-10-25 16:10 ` Peter Pastor
2010-10-25 16:10 ` Peter Pastor
2010-10-25 16:24 ` Eric Noulard
2010-10-25 18:04 ` Peter Pastor
2010-10-25 18:13 ` Eric Noulard
2010-10-25 18:15 ` Jan Kiszka
2010-10-25 19:03 ` Peter Pastor
2010-10-25 19:40 ` Jan Kiszka [this message]
2010-10-25 20:28 ` Jan Kiszka
2010-10-25 21:10 ` Peter Pastor
2010-10-25 21:21 ` Philippe Gerum
2010-10-25 21:26 ` Jan Kiszka
2010-10-25 21:33 ` Jan Kiszka
2010-10-25 21:43 ` Philippe Gerum
2010-10-26 0:58 ` Peter Pastor
2010-10-26 5:20 ` Jan Kiszka
2010-10-25 16:13 ` Peter Pastor
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