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下载 - Centos 上的上传速度太慢

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下载 - Centos 上的上传速度太慢

我的服务器的下载/上传速度太慢了（大约 50 Kb/s）！

我的配置是否遗漏了什么？

一些信息：

CentOS 版本 6.3

正常运行时间

load average: 0.17, 0.32, 0.37

记忆

free -m
             total       used       free     shared    buffers     cached
Mem:         24009      21988       2021          0        806      18098
-/+ buffers/cache:       3083      20926
Swap:         4095         28       4067


lshw -C network
  *-network               
       description: Ethernet interface
       product: 82574L Gigabit Network Connection
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 00
       serial: 00:25:90:70:17:4a
       size: 100MB/s
       capacity: 1GB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=off broadcast=yes driver=e1000e driverversion=1.9.5-k duplex=full firmware=2.1-2 ip=108.175.8.123 latency=0 link=yes multicast=yes port=twisted pair speed=100MB/s
       resources: irq:16 memory:fb900000-fb91ffff ioport:e000(size=32) memory:fb920000-fb923fff

ethtool

ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: off
        MDI-X: off
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000001 (1)
        Link detected: yes

dmesg |grep e1000e

dmesg |grep e1000e
e1000e: Intel(R) PRO/1000 Network Driver - 1.9.5-k
e1000e: Copyright(c) 1999 - 2012 Intel Corporation.
e1000e 0000:02:00.0: Disabling ASPM L0s 
e1000e 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
e1000e 0000:02:00.0: setting latency timer to 64
e1000e 0000:02:00.0: irq 33 for MSI/MSI-X
e1000e 0000:02:00.0: irq 34 for MSI/MSI-X
e1000e 0000:02:00.0: irq 35 for MSI/MSI-X
e1000e 0000:02:00.0: eth0: (PCI Express:2.5GT/s:Width x1) 00:25:90:70:17:4a
e1000e 0000:02:00.0: eth0: Intel(R) PRO/1000 Network Connection
e1000e 0000:02:00.0: eth0: MAC: 3, PHY: 8, PBA No: FFFFFF-0FF
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e 0000:02:00.0: eth0: Unsupported Speed/Duplex configuration
e1000e: eth0 NIC Link is Up 10 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e 0000:02:00.0: Disabling ASPM  L1
e1000e 0000:02:00.0: eth0: changing MTU from 1500 to 9000
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO
e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
e1000e 0000:02:00.0: eth0: 10/100 speed: disabling TSO

答案1

您手动将速度设置为 100 MBit、全双工，而不是进行自动协商。

您的提供商可能已设置自动协商。结果是网络端的端口将降至 100 MBit 半双工。

因此，这里存在双工不匹配的情况（并且可能需要多次重新传输）。

将其设置为自动协商-然后再次查看netstat -i和ethtool。

答案2

这一行：

e1000e 0000:02:00.0: eth0: changing MTU from 1500 to 9000

有点令人担忧。该服务器与互联网上任何随机点之间的 MTU 几乎保证不会高于 1500，因此将其设置得更高并不是一件好事。我希望这不是故障排除步骤，因为这种配置只会损害性能。

您有时会在虚拟交换机上的 VMWare 主机中看到该设置，但这应该是物理硬件。

您可以通过 验证适配器的 MTU 设置ifconfig eth0，它将被列出。

要在 CenOS 上将其设置回 1500，请更改/etc/sysconfig/network/ifcfg-eth0；如果将其设置为 9000，其中将会有一条 MTU 行。

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