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    SubjectRe: [RFC PATCH 0/3] Sharing MSIX irq for tx/rx queue pairs

    On 12/28/2014 03:52 PM, Michael S. Tsirkin wrote:
    > On Fri, Dec 26, 2014 at 10:53:42AM +0800, Jason Wang wrote:
    >> Hi all:
    >>
    >> This series try to share MSIX irq for each tx/rx queue pair. This is
    >> done through:
    >>
    >> - introducing virtio pci channel which are group of virtqueues that
    >> sharing a single MSIX irq (Patch 1)
    >> - expose channel setting to virtio core api (Patch 2)
    >> - try to use channel setting in virtio-net (Patch 3)
    >>
    >> For the transport that does not support channel, channel paramters
    >> were simply ignored. For devices that does not use channel, it can
    >> simply pass NULL or zero to virito core.
    >>
    >> With the patch, 1 MSIX irq were saved for each TX/RX queue pair.
    >>
    >> Please review.
    > How does this sharing affect performance?
    >

    Patch 3 only checks more_used() for tx ring which in fact reduces the
    effect of event index and may introduce more tx interrupts. After fixing
    this issue, tested with 1 vcpu and 1 queue. No obvious changes in
    performance were noticed.

    Thanks



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