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Subject: Re: [virtio-dev] Re: [PATCH v2 4/5] virtio-mmio: add MSI interrupt feature support
On 2020/2/12 äå5:16, Michael S. Tsirkin wrote:
Thanks for the advice.:) Actually when looking into pci, the queue_msix_vector/msix_config is the msi vector index, which is the same as the mmio register MsiVecSel (0x0d0). So we don't introduce two extra registers for mapping even in sharing mode. What do you think?I'm not sure I get the point, but I still prefer the separate vector_sel from queue_msix_vector. Btw, Michael propose per vq registers which could also work. ThanksRight and I'd even ask a question: do we need shared MSI at all?
I guess it is still needed at least for the current virtio code. Technically we may have thousands queues.
Thanks
Is it somehow better than legacy interrupt? And why? Performance numbers please.
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