From: Avi Kivity <avi@redhat.com>
To: "Zhang, Yang" <yang.zhang@intel.com>
Cc: "kvm-ia64@vger.kernel.org" <kvm-ia64@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: [PATCH] KVM: IA64: enable external interrupt in vmm
Date: Wed, 25 Mar 2009 13:54:03 +0200 [thread overview]
Message-ID: <49CA1B5B.6090107@redhat.com> (raw)
In-Reply-To: <10C63FAD690C13458F0B32BCED571F140E29AF98@pdsmsx502.ccr.corp.intel.com>
Zhang, Yang wrote:
> Avi Kivity wrote:
>
>> I'm surprised it doesn't work this way already. What happens now if
>> the guest disables interrupts and spins?
>>
> when vmm disables interrupt, all the external interrupts are pending
> until return back to the guest. and this will degrade the i/o performance.
Oh I misunderstood. When the guest us running interrupts are enabled,
this was true before. The change enables interrupts in the monitor, so
it improves responsiveness.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: kvm-ia64@vger.kernel.org
Subject: Re: [PATCH] KVM: IA64: enable external interrupt in vmm
Date: Wed, 25 Mar 2009 11:54:03 +0000 [thread overview]
Message-ID: <49CA1B5B.6090107@redhat.com> (raw)
In-Reply-To: <10C63FAD690C13458F0B32BCED571F140E29AF79@pdsmsx502.ccr.corp.intel.com>
Zhang, Yang wrote:
> Avi Kivity wrote:
>
>> I'm surprised it doesn't work this way already. What happens now if
>> the guest disables interrupts and spins?
>>
> when vmm disables interrupt, all the external interrupts are pending
> until return back to the guest. and this will degrade the i/o performance.
Oh I misunderstood. When the guest us running interrupts are enabled,
this was true before. The change enables interrupts in the monitor, so
it improves responsiveness.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-03-25 11:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-25 10:27 [PATCH] KVM: IA64: enable external interrupt in vmm Zhang, Yang
2009-03-25 10:27 ` Zhang, Yang
2009-03-25 10:35 ` Avi Kivity
2009-03-25 10:35 ` Avi Kivity
2009-03-25 11:45 ` Zhang, Yang
2009-03-25 11:45 ` Zhang, Yang
2009-03-25 11:54 ` Avi Kivity [this message]
2009-03-25 11:54 ` Avi Kivity
2009-03-25 11:57 ` Zhang, Yang
2009-03-25 11:57 ` Zhang, Yang
2009-03-26 8:58 ` Avi Kivity
2009-03-26 8:58 ` Avi Kivity
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