我有一台服务器在CentOS 5.3上运行（一个彗星聊天服务器，将有很多的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事情。
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) 当我重新启动它的networking时，一切顺利。 但过了一段时间后，它会再次变慢。
有人可以帮忙吗？
更新：
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正如Rajat所要求的，我会发布一些诊断信息
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 0xffffc20000006000, 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 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
几件事情来检查：
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是否具有相同的设置[期望的是：全双工，100或1000 MBit / s。 双方相同]
如果没有双工错误 – 检查交换机端口和networking接口 – 可能其中之一是有故障的
检查/更换跳线，可能是有故障的或者有些干扰源
你使用哪个网卡通常是用驱动程序，你可以重新安装它们
uname -a lspci |grep Ethernet dmesg |grep eth0 ethtool eth0 ethtool -k eth0 ethtool -S eth0
拿出这个和后回来