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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [question] virtio-blk performance degradationhappened with virito-serial |
| Date: | Mon, 01 Sep 2014 15:12:45 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
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
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