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From: Paolo Bonzini <pbonzini@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
	Zhang Haoyu <zhanghy@sangfor.com>,
	Amit Shah <amit.shah@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] [question] virtio-blk performance degradationhappened with virito-serial
Date: Mon, 01 Sep 2014 15:29:03 +0200	[thread overview]
Message-ID: <5404749F.7050606@redhat.com> (raw)
In-Reply-To: <5404731A.8020405@de.ibm.com>

Il 01/09/2014 15:22, Christian Borntraeger ha scritto:
> > > If virtio-blk and virtio-serial share an IRQ, the guest operating system has to check each virtqueue for activity. Maybe there is some inefficiency doing that.
> > > AFAIK virtio-serial registers 64 virtqueues (on 31 ports + console) even if everything is unused.
> > 
> > That could be the case if MSI is disabled.
> 
> Do the windows virtio drivers enable MSIs, in their inf file?

It depends on the version of the drivers, but it is a reasonable guess
at what differs between Linux and Windows.  Haoyu, can you give us the
output of lspci from a Linux guest?

Paolo

  reply	other threads:[~2014-09-01 13:29 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-29  7:45 [question] virtio-blk performance degradation happened with virito-serial Zhang Haoyu
2014-08-29  7:45 ` [Qemu-devel] " Zhang Haoyu
2014-08-29 14:38 ` Amit Shah
2014-09-01 12:38   ` [Qemu-devel] [question] virtio-blk performance degradationhappened " Zhang Haoyu
2014-09-01 12:46     ` Amit Shah
2014-09-01 12:57       ` [Qemu-devel] [question] virtio-blk performancedegradationhappened " Zhang Haoyu
2014-09-01 12:52     ` [Qemu-devel] [question] virtio-blk performance degradationhappened " Zhang Haoyu
2014-09-01 13:09       ` Christian Borntraeger
2014-09-01 13:12         ` Paolo Bonzini
2014-09-01 13:22           ` Christian Borntraeger
2014-09-01 13:29             ` Paolo Bonzini [this message]
2014-09-01 14:03               ` Christian Borntraeger
2014-09-01 14:15                 ` Christian Borntraeger
2014-09-04  7:56             ` [Qemu-devel] [question] virtio-blk performance degradationhappenedwith virito-serial Zhang Haoyu
2014-09-07  9:46               ` Zhang Haoyu
2014-09-07  9:46                 ` Zhang Haoyu
2014-09-11  6:11                 ` Amit Shah
2014-09-11  6:11                   ` Amit Shah
2014-09-12  3:21                   ` [question] virtio-blk performance degradation happened with virito-serial Zhang Haoyu
2014-09-12  3:21                     ` [Qemu-devel] " Zhang Haoyu
2014-09-12 12:38                     ` Stefan Hajnoczi
2014-09-12 12:38                       ` Stefan Hajnoczi
2014-09-13 17:22                       ` Max Reitz
2014-09-13 17:22                         ` Max Reitz
2014-09-16 14:59                     ` Zhang Haoyu
2014-09-16 14:59                       ` [Qemu-devel] " Zhang Haoyu
2014-09-02  6:36       ` [Qemu-devel] [question] virtio-blk performance degradationhappened " Amit Shah
2014-09-02 18:05         ` Andrey Korolyov
2014-09-02 18:11           ` Amit Shah
2014-09-02 18:11             ` [Qemu-devel] " Amit Shah
2014-09-02 18:27             ` Andrey Korolyov
2014-09-04  2:20         ` [Qemu-devel] [question] virtio-blk performancedegradationhappened " Zhang Haoyu
2014-09-19  5:53         ` [Qemu-devel] [question] virtio-blk performance degradationhappened " Fam Zheng
2014-09-19  5:53           ` Fam Zheng
2014-09-19 13:35           ` Paolo Bonzini
2014-09-19 13:35             ` [Qemu-devel] " Paolo Bonzini
2014-09-22 13:23           ` [Qemu-devel] [question] virtio-blk performancedegradationhappened " Zhang Haoyu
2014-09-22 13:23             ` Zhang Haoyu
2014-09-23  1:29             ` Fam Zheng
2014-09-23  1:29               ` Fam Zheng

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