From: Stefano Garzarella <sgarzare@redhat.com>
To: netdev@vger.kernel.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>,
virtualization@lists.linux-foundation.org,
"Michael S. Tsirkin" <mst@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Jason Wang <jasowang@redhat.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH v3 3/5] vsock/virtio: reduce credit update messages
Date: Fri, 31 May 2019 15:39:52 +0200 [thread overview]
Message-ID: <20190531133954.122567-4-sgarzare@redhat.com> (raw)
In-Reply-To: <20190531133954.122567-1-sgarzare@redhat.com>
In order to reduce the number of credit update messages,
we send them only when the space available seen by the
transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
include/linux/virtio_vsock.h | 1 +
net/vmw_vsock/virtio_transport_common.c | 16 +++++++++++++---
2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 53703fe03681..23396b996214 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -41,6 +41,7 @@ struct virtio_vsock_sock {
/* Protected by rx_lock */
u32 buf_alloc;
u32 fwd_cnt;
+ u32 last_fwd_cnt;
u32 rx_bytes;
struct list_head rx_queue;
};
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 694d9805f989..f7b0c4911308 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -212,6 +212,7 @@ static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
{
spin_lock_bh(&vvs->rx_lock);
+ vvs->last_fwd_cnt = vvs->fwd_cnt;
pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
spin_unlock_bh(&vvs->rx_lock);
@@ -262,6 +263,7 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
struct virtio_vsock_sock *vvs = vsk->trans;
struct virtio_vsock_pkt *pkt;
size_t bytes, total = 0;
+ u32 free_space;
int err = -EFAULT;
spin_lock_bh(&vvs->rx_lock);
@@ -292,11 +294,19 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
virtio_transport_free_pkt(pkt);
}
}
+
+ free_space = vvs->buf_alloc - (vvs->fwd_cnt - vvs->last_fwd_cnt);
+
spin_unlock_bh(&vvs->rx_lock);
- /* Send a credit pkt to peer */
- virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
- NULL);
+ /* We send a credit update only when the space available seen
+ * by the transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE
+ */
+ if (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
+ virtio_transport_send_credit_update(vsk,
+ VIRTIO_VSOCK_TYPE_STREAM,
+ NULL);
+ }
return total;
--
2.20.1
next prev parent reply other threads:[~2019-05-31 13:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-31 13:39 [PATCH v3 0/5] vsock/virtio: optimizations to increase the throughput Stefano Garzarella
2019-05-31 13:39 ` [PATCH v3 1/5] vsock/virtio: limit the memory used per-socket Stefano Garzarella
2019-06-10 13:44 ` Stefan Hajnoczi
2019-05-31 13:39 ` [PATCH v3 2/5] vsock/virtio: fix locking for fwd_cnt and buf_alloc Stefano Garzarella
2019-06-03 1:03 ` David Miller
2019-06-03 11:07 ` Stefano Garzarella
2019-05-31 13:39 ` Stefano Garzarella [this message]
2019-05-31 13:39 ` [PATCH v3 4/5] vhost/vsock: split packets to send using multiple buffers Stefano Garzarella
2019-05-31 13:39 ` [PATCH v3 5/5] vsock/virtio: change the maximum packet size allowed Stefano Garzarella
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