linux-kernel - [PATCH V3 15/15] vhost: enable packed virtqueues

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Date:   Wed, 17 Jul 2019 06:52:55 -0400
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jfreimann@...hat.com, tiwei.bie@...el.com,
        maxime.coquelin@...hat.com
Subject: [PATCH V3 15/15] vhost: enable packed virtqueues

This patch enables packed virtqueue support for vhost.

Testpmd (virtio-user) + vhost_net shows about 2.6% improvemetn on TX
PPS:

Before: 5.75Mpps
After : 5.90Mpps

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/vhost.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index bb3f8bb763b9..5483eea84a5c 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -326,7 +326,8 @@ enum {
 			 (1ULL << VIRTIO_RING_F_EVENT_IDX) |
 			 (1ULL << VHOST_F_LOG_ALL) |
 			 (1ULL << VIRTIO_F_ANY_LAYOUT) |
-			 (1ULL << VIRTIO_F_VERSION_1)
+			 (1ULL << VIRTIO_F_VERSION_1) |
+			 (1ULL << VIRTIO_F_RING_PACKED)
 };
 
 static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
-- 
2.18.1