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Linux 中的 LAN 带宽较低

tag-icon • tag-icon linux networking windows-7 bandwidth slow-connection
Linux 中的 LAN 带宽较低

大家好，我连接了两台电脑，两台电脑都带1000Mbps网卡，一台电脑（A）运行Fedora 8，另一台电脑（B）运行Windows7。我用Ixchariot测试两台电脑之间的带宽，显示大约10Mbps。如果A和B都运行Windows7，我再运行Ixchariot，显示大约1000Mbps。我从B向A（Fedora 8）传输文件，速度大约是10Mbps。为什么两次测试的带宽不同？

以下是 ifconfig 和 ethtool 的输出：

[root@Dom1 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:24:1D:50:B9:C0  
          inet addr:192.168.1.101  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::224:1dff:fe50:b9c0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:290214 errors:0 dropped:889731948 overruns:0 frame:0
          TX packets:579263 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:19165638 (18.2 MiB)  TX bytes:875177493 (834.6 MiB)
          Interrupt:17 Base address:0xc000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4932 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4932 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:5011460 (4.7 MiB)  TX bytes:5011460 (4.7 MiB)

[root@Dom1 ~]# ethtool -S eth0
NIC statistics:
     tx_packets: 816440
     rx_packets: 409104
     tx_errors: 0
     rx_errors: 0
     rx_missed: 0
     align_errors: 0
     tx_single_collisions: 0
     tx_multi_collisions: 0
     unicast: 408962
     broadcast: 38
     multicast: 142
     tx_aborted: 0
     tx_underrun: 0

[root@Dom1 ~]# ethtool eth0
Settings for eth0:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  Not reported
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
        Link detected: yes

[root@Dom1 ~]# ethtool -i eth0
driver: r8169
version: 2.2LK-NAPI
firmware-version: 
bus-info: 0000:03:00.0

答案1

您的 NIC 或驱动程序确实有问题。ifconfig报告RX 数据包：290214 错误：0 丢弃：889731948 超限：0 帧：0因此几乎有 9 亿个数据包被丢弃，只有 30 万个数据包被接收！这真是太庞大了！

尝试调查日志（/var/log/messages和的输出dmesg）。

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