From: Eduardo Habkost <ehabkost@redhat.com>
To: kvm@vger.kernel.org
Subject: Re: 2.6.27.5 guest boot failure using in-kernel PIT
Date: Thu, 20 Nov 2008 20:05:17 -0200 [thread overview]
Message-ID: <20081120220517.GB30825@blackpad> (raw)
In-Reply-To: <20081120142253.GA30825@blackpad>
On Thu, Nov 20, 2008 at 12:22:53PM -0200, Eduardo Habkost wrote:
>
> Hi,
>
> When using a kvm.git kernel as host, I am getting guest boot failures
> when booting Fedora Rawhide kernel (2.6.27.5-117.fc10.x86_64). Guest
> stops booting at:
>
> ENABLING IO-APIC IRQs
> ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> ...trying to set up timer (IRQ0) through the 8259A ...
> ..... (found apic 0 pin 0) ...
> ....... failed.
> ...trying to set up timer as Virtual Wire IRQ...
> ..... failed.
> ...trying to set up timer as ExtINT IRQ...
I've just found out this problem happens because the guest has HZ=1000
and the host had HZ=250 and no CONFIG_HIGH_RES_TIMERS.
With this setup, the host is not managing to inject enough timer
interrupts during the mdelay() loop on timer_irq_works().
--
Eduardo
next prev parent reply other threads:[~2008-11-20 22:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-20 14:22 2.6.27.5 guest boot failure using in-kernel PIT Eduardo Habkost
2008-11-20 22:05 ` Eduardo Habkost [this message]
2008-11-21 3:05 ` Sheng Yang
2008-11-21 7:54 ` Jan Kiszka
2008-11-21 13:17 ` Eduardo Habkost
2008-11-21 15:41 ` Jan Kiszka
2008-11-21 16:39 ` Eduardo Habkost
2008-11-21 17:06 ` Eduardo Habkost
2008-11-24 17:02 ` hrtimer_forward() semantics when using non-high-res timers Eduardo Habkost
2008-11-21 17:10 ` 2.6.27.5 guest boot failure using in-kernel PIT Marcelo Tosatti
2008-11-24 14:33 ` Glauber Costa
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