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f6a15d8549
This patch implements in order support for both split virtqueue and
packed virtqueue. Performance could be gained for the device where the
memory access could be expensive (e.g vhost-net or a real PCI device):
Benchmark with KVM guest:
Vhost-net on the host: (pktgen + XDP_DROP):
in_order=off | in_order=on | +%
TX: 4.51Mpps | 5.30Mpps | +17%
RX: 3.47Mpps | 3.61Mpps | + 4%
Vhost-user(testpmd) on the host: (pktgen/XDP_DROP):
For split virtqueue:
in_order=off | in_order=on | +%
TX: 5.60Mpps | 5.60Mpps | +0.0%
RX: 9.16Mpps | 9.61Mpps | +4.9%
For packed virtqueue:
in_order=off | in_order=on | +%
TX: 5.60Mpps | 5.70Mpps | +1.7%
RX: 10.6Mpps | 10.8Mpps | +1.8%
Benchmark also shows no performance impact for in_order=off for queue
size with 256 and 1024.
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20251230064649.55597-20-jasowang@redhat.com>