linux – 许多丢弃了我的NIC数据包

概述我有一台运行在CentOS 5.3上的服务器(一个彗星聊天服务器,将有很多tcp连接).最近我发现它很慢(http服务和ssh)所以我使用“ifconfig”命令来弄清楚发生了什么. eth0 Link encap:Ethernet HWaddr 00:1C:C0:B5:D5:EA inet addr:10.0.0.61 Bcast:10.0.0.255 M 我有一台运行在CentOS 5.3上的服务器(一个彗星聊天服务器,将有很多tcp连接).最近我发现它很慢(http服务和ssh)所以我使用“ifconfig”命令来弄清楚发生了什么.

eth0      link encap:Ethernet  HWaddr 00:1C:C0:B5:D5:EA            inet addr:10.0.0.61  Bcast:10.0.0.255  Mask:255.255.255.0          inet6 addr: fe80::21c:c0ff:feb5:d5ea/64 Scope:link          UP broADCAST RUNNING MulTICAST  MTU:1500  Metric:1          RX packets:871861 errors:0 dropped:489662344145 overruns:0 frame:0          TX packets:639044 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:1000           RX bytes:207239658 (197.6 MiB)  TX bytes:169416201 (161.5 MiB)          Interrupt:225 Base address:0x6000 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:44497 errors:0 dropped:0 overruns:0 frame:0          TX packets:44497 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:0           RX bytes:11470951 (10.9 MiB)  TX bytes:11470951 (10.9 MiB)

当我重新启动网络时,一切顺利.但经过一段时间后,它会再次变慢.

有人可以帮忙吗？

更新：

================================================== ==============================

正如Rajat所要求的那样,我将发布一些诊断信息

uname -alinux im.cluster.myserver.com 2.6.18-128.el5 #1 SMP Wed Jan 21 10:41:14 EST 2009 x86_64 x86_64 x86_64 GNU/linuxsudo /sbin/lspci | grep Ethernet02:00.0 Ethernet controller: Realtek Semiconductor Co.,Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03) sudo dmesg | grep eth0eth0: RTL8168d/8111d at 0xffffc200000
eth0      link encap:Ethernet  HWaddr 00:1C:C0:B5:D5:EA            inet addr:10.0.0.61  Bcast:10.0.0.255  Mask:255.255.255.0          inet6 addr: fe80::21c:c0ff:feb5:d5ea/64 Scope:link          UP broADCAST RUNNING MulTICAST  MTU:1500  Metric:1          RX packets:871861 errors:0 dropped:489662344145 overruns:0 frame:0          TX packets:639044 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:1000           RX bytes:207239658 (197.6 MiB)  TX bytes:169416201 (161.5 MiB)          Interrupt:225 Base address:0x6000 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:44497 errors:0 dropped:0 overruns:0 frame:0          TX packets:44497 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:0           RX bytes:11470951 (10.9 MiB)  TX bytes:11470951 (10.9 MiB)
,00:1c:c0:b5:d5:ea,XID 281000c0 IRQ 225
 r8169: eth0: link up
 r8169: eth0: link up
 eth0: no IPv6 routers present
 r8169: eth0: link up
 eth0: no IPv6 routers present
 sudo /sbin/ethtool eth0
 Settings for eth0:
 Supported ports: [ TP MII ]
 Supported link modes: 10baseT/Half 10baseT/Full
 100baseT/Half 100baseT/Full
 1000baseT/Half 1000baseT/Full
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
 100baseT/Half 100baseT/Full
 1000baseT/Half 1000baseT/Full
 Advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: MII
 PHYAD: 0
 Transceiver: internal
 auto-negotiation: on
 Supports Wake-on: pumbg
 Wake-on: p
 Current message level: 0x00000033 (51)
 link detected: yes
sudo /sbin/ethtool -k eth0
 Offload parameters for eth0:
 Cannot get device udp large send offload settings: Operation not supported
 rx-checksumming: on
 tx-checksumming: off
 scatter-gather: off
 tcp segmentation offload: off
 udp fragmentation offload: off
 generic segmentation offload: off
eth0      link encap:Ethernet  HWaddr 00:1C:C0:B5:D5:EA            inet addr:10.0.0.61  Bcast:10.0.0.255  Mask:255.255.255.0          inet6 addr: fe80::21c:c0ff:feb5:d5ea/64 Scope:link          UP broADCAST RUNNING MulTICAST  MTU:1500  Metric:1          RX packets:871861 errors:0 dropped:489662344145 overruns:0 frame:0          TX packets:639044 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:1000           RX bytes:207239658 (197.6 MiB)  TX bytes:169416201 (161.5 MiB)          Interrupt:225 Base address:0x6000 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:44497 errors:0 dropped:0 overruns:0 frame:0          TX packets:44497 errors:0 dropped:0 overruns:0 carrIEr:0          collisions:0 txqueuelen:0           RX bytes:11470951 (10.9 MiB)  TX bytes:11470951 (10.9 MiB)sudo /sbin/ethtool -S eth0
 NIC statistics:
 tx_packets: 4483119
 rx_packets: 7443820
 tx_errors: 0
 rx_errors: 0
 rx_missed: 0
 align_errors: 0
 tx_single_collisions: 0
 tx_multi_collisions: 0
 unicast: 3591906
 broadcast: 442720
 multicast: 3851914
 tx_aborted: 0
 tx_underrun: 0

解决方法 要检查的几件事：

>运行ethtool eth0并查看接口上的速度/双工状态,然后检查连接服务器的端口上的开关是否具有相同的设置[预期为：全双工,100或1000 MBit / s.两侧相同]>如果没有双工不匹配 – 检查交换机端口和网络接口 – 可能其中一个有问题>检查/更换跳线,可能是有故障或有干扰源

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