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[Qemu-devel] Measure virtio-vsock speed
From: |
Zhang Shuaiyi |
Subject: |
[Qemu-devel] Measure virtio-vsock speed |
Date: |
Thu, 15 Dec 2016 17:00:35 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
I used kernel 4.8 and qemu v2.8.0-rc3.
Qemu command line:
-device vhost-vsock-pci,id=vhost-vsock-pci0,guest-cid=3
I try to use nc-vsock to test vsock speed.
1. In host:
# modprobe vhost-vsock
# ./nc-vsock -l 1234 > /dev/null
2. In guest:
a. use pv and nc-vsock, speed is about 62MB/s.
# pv /dev/zero | ./nc-vsock 3 1234
b. use dd and nc-vsock, speed is about 67MB/s.
# dd if=/dev/zero bs=1M count=2000 | ./nc-vsock 3 1234
I think nc-vsock can not get the maximum speed, so I modified
nc-vsock.c.
1. In host, just recv data without printf.
2. In guest, use gettimeofday to record interval and send zero bufs.
#define MAXLEN 65536
char buf[MAXLEN] = {0};
unsigned long long num = 0;
gettimeofday(&start_time, NULL);
for (n = 0; n 1000000; n++) {
ret = send(fd, buf, MAXLEN, 0);
if (ret 0) {
fprintf(stderr, "send error ret:%d\n", ret);
break;
}
num += ret;
}
gettimeofday(&end_time, NULL);
In this way, the virtio-vsock speed is about 500MB/s. But use iperf to
test virtio-net, the speed is about 1.5GB/s.
Iperf can be used to test virtio-net, is there a tool to test maximum
virtio-vsock speed?
At present, virtio-vsock is faster than virtio-net?
- [Qemu-devel] Measure virtio-vsock speed,
Zhang Shuaiyi <=