virtio-net: enable multiqueue by default

We use single queue even if multiqueue is enabled and let admin to
enable it through ethtool later. This is used to avoid possible
regression (small packet TCP stream transmission). But looks like an
overkill since:

- single queue user can disable multiqueue when launching qemu
- brings extra troubles for the management since it needs extra admin
  tool in guest to enable multiqueue
- multiqueue performs much better than single queue in most of the
  cases

So this patch enables multiqueue by default: if #queues is less than or
equal to #vcpu, enable as much as queue pairs; if #queues is greater
than #vcpu, enable #vcpu queue pairs.

Cc: Hannes Frederic Sowa <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Neil Horman <[email protected]>
Cc: Jeremy Eder <[email protected]>
Cc: Marko Myllynen <[email protected]>
Cc: Maxime Coquelin <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Acked-by: Neil Horman <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions