mirror of https://github.com/proxmox/mirror_qemu
virtio-blk: suppress virtqueue kick during processing
The guest does not need to kick the virtqueue while we are processing it. This reduces the number of vmexits during periods of heavy I/O. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20161201192652.9509-8-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>master
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0d9d86fb4d
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9ef9d40261
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@ -588,13 +588,19 @@ void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
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blk_io_plug(s->blk);
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while ((req = virtio_blk_get_request(s, vq))) {
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if (virtio_blk_handle_request(req, &mrb)) {
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virtqueue_detach_element(req->vq, &req->elem, 0);
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virtio_blk_free_request(req);
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break;
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do {
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virtio_queue_set_notification(vq, 0);
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while ((req = virtio_blk_get_request(s, vq))) {
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if (virtio_blk_handle_request(req, &mrb)) {
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virtqueue_detach_element(req->vq, &req->elem, 0);
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virtio_blk_free_request(req);
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break;
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}
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}
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}
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virtio_queue_set_notification(vq, 1);
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} while (!virtio_queue_empty(vq));
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if (mrb.num_reqs) {
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virtio_blk_submit_multireq(s->blk, &mrb);
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