On 2018/10/15 14:12, jiangyiwen wrote:

On 2018/10/15 10:33, Jason Wang wrote:

quoted

On 2018年10月15日 09:43, jiangyiwen wrote:

quoted

Hi Stefan & All:

Now I find vhost-vsock has two performance problems even if it
is not designed for performance.

First, I think vhost-vsock should faster than vhost-net because it
is no TCP/IP stack, but the real test result vhost-net is 5~10
times than vhost-vsock, currently I am looking for the reason.

TCP/IP is not a must for vhost-net.

How do you test and compare the performance?

Thanks

I test the performance used my test tool, like follows:

Server                   Client
socket()
bind()
listen()

                         socket(AF_VSOCK) or socket(AF_INET)
Accept() <-------------->connect()
                         *======Start Record Time======*
                         Call syscall sendfile()
Recv()
                         Send end
Receive end
Send(file_size)
                         Recv(file_size)
                         *======End Record Time======*

The test result, vhost-vsock is about 500MB/s, and vhost-net is about 2500MB/s.

By the way, vhost-net use single queue.

Thanks.

quoted

quoted

Second, vhost-vsock only supports two vqs(tx and rx), that means
if multiple sockets in the guest will use the same vq to transmit
the message and get the response. So if there are multiple applications
in the guest, we should support "Multiqueue" feature for Virtio-vsock.

Stefan, have you encountered these problems?

Thanks,
Yiwen.

.

Hi Jason and Stefan,

Maybe I find the reason of bad performance.

I found pkt_len is limited to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE(4K),
it will cause the bandwidth is limited to 500~600MB/s. And once I
increase to 64k, it can improve about 3 times(~1500MB/s).

By the way, I send to 64K in application once, and I don't use
sg_init_one and rewrite function to packet sg list because pkt_len
include multiple pages.

Thanks,
Yiwen.

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