diff options
| author | Ladi Prosek <lprosek@redhat.com> | 2016-08-31 14:00:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-10 16:36:34 +0100 |
| commit | 50e1c4d90aff5b1f66f9e28a724f3878cb307846 (patch) | |
| tree | 08955e70741073e0ee0abb0f3be300d895afe542 /kernel | |
| parent | f2d9107bd0a0f86c4b3fb539a2d980ada926c276 (diff) | |
virtio_ring: Make interrupt suppression spec compliant
commit 0ea1e4a6d9b62cf29e210d2b4ba9fd43917522e3 upstream.
According to the spec, if the VIRTIO_RING_F_EVENT_IDX feature bit is
negotiated the driver MUST set flags to 0. Not dirtying the available
ring in virtqueue_disable_cb also has a minor positive performance
impact, improving L1 dcache load missed by ~0.5% in vring_bench.
Writes to the used event field (vring_used_event) are still unconditional.
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions