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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 -a
Linux 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/Linux
sudo /sbin/lspci | grep Ethernet
02:00.0 Ethernet controller: Realtek Semiconductor Co.,Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
sudo dmesg | grep eth0
eth0: RTL8168d/8111d at 0xffffc200000eth0 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 （编辑：安卓应用网）
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