e1000 和 virtio-pci 驱动的性能比较

Question

我做了以下设置来比较virtio-pci和e1000驱动程序的性能：

virtio-pci与 相比e1000，我希望看到更高的吞吐量，但它们的表现相同。

使用virtio-pci(192.168.0.126配置为T60并且192.168.0.129配置为PC1) 进行测试：

root@PC1:~# grep hype /proc/cpuinfo
flags       : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl pni vmx cx16 x2apic hypervisor lahf_lm tpr_shadow vnmi flexpriority ept vpid
root@PC1:~# lspci -s 00:03.0 -v
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
    Subsystem: Red Hat, Inc Device 0001
    Physical Slot: 3
    Flags: bus master, fast devsel, latency 0, IRQ 11
    I/O ports at c000 [size=32]
    Memory at febd1000 (32-bit, non-prefetchable) [size=4K]
    Expansion ROM at feb80000 [disabled] [size=256K]
    Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
    Kernel driver in use: virtio-pci

root@PC1:~# iperf -c 192.168.0.126 -d -t 30 -l 64
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.0.126, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.129 port 41573 connected with 192.168.0.126 port 5001
[  5] local 192.168.0.129 port 5001 connected with 192.168.0.126 port 44480
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-30.0 sec   126 MBytes  35.4 Mbits/sec
[  5]  0.0-30.0 sec   126 MBytes  35.1 Mbits/sec
root@PC1:~# 

使用e1000(192.168.0.126配置为T60并且192.168.0.129配置为PC1) 进行测试：

root@PC1:~# grep hype /proc/cpuinfo
flags       : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl pni vmx cx16 x2apic hypervisor lahf_lm tpr_shadow vnmi flexpriority ept vpid
root@PC1:~# lspci -s 00:03.0 -v
00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 03)
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Physical Slot: 3
    Flags: bus master, fast devsel, latency 0, IRQ 11
    Memory at febc0000 (32-bit, non-prefetchable) [size=128K]
    I/O ports at c000 [size=64]
    Expansion ROM at feb80000 [disabled] [size=256K]
    Kernel driver in use: e1000

root@PC1:~# iperf -c 192.168.0.126 -d -t 30 -l 64
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.0.126, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.129 port 42200 connected with 192.168.0.126 port 5001
[  5] local 192.168.0.129 port 5001 connected with 192.168.0.126 port 44481
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-30.0 sec   126 MBytes  35.1 Mbits/sec
[  5]  0.0-30.0 sec   126 MBytes  35.1 Mbits/sec
root@PC1:~# 

对于大数据包，两个驱动程序的带宽约为 900Mbps。

理论更高的性能何时virtio-pci开始发挥作用？为什么我看到与e1000和相同的性能virtio-pci？

Answer 1

您确实执行了带宽测试，该测试不会对 PCI 造成压力。

您需要模拟具有许多并发会话的环境。在那里你应该看到区别。

也许-P 400可以使用 iperf 模拟此类测试。