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| From: | Christian Borntraeger |
| Subject: | Re: [Qemu-devel] [question] virtio-blk performance degradationhappened with virito-serial |
| Date: | Mon, 01 Sep 2014 15:22:34 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 01/09/14 15:12, Paolo Bonzini wrote: > Il 01/09/2014 15:09, Christian Borntraeger ha scritto: >> This is just wild guessing: >> 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. > > Paolo > Do the windows virtio drivers enable MSIs, in their inf file? Christian
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