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Michael S. Tsirkin authored
Commit 0d8d7690 introduced a regression in virtio-net performance because it looks into the ring aggressively while we really only care about a single packet worth of buffers. Reported as bugzilla 1066055 in launchpad. To fix, add parameters limiting lookahead, and use in virtqueue_avail_bytes. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reported-by: Edivaldo de Araujo Pereira <edivaldoapereira@yahoo.com.br> Tested-by: Edivaldo de Araujo Pereira <edivaldoapereira@yahoo.com.br> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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