服務(wù)器上下行流量不對稱，上行速度慢
2014/12/17 14:00:45點擊：
問題描述
客戶一臺服務(wù)器通過10G網(wǎng)卡連接在CE6850交換機的10G電口下，該服務(wù)器從同局域網(wǎng)內(nèi)其他服務(wù)器上通過windows文件共享下載文件速度可達100MB/s，但是上傳文件速度只有110KB/s，上傳速度無法接受。
處理過程
1. 排查交換機告警，該端口無告警。
2. 查看交換機接口狀態(tài)，無錯包：
10GE1/0/14 current state : UP (ifindex: 18)
Line protocol current state : UP
Description:
Switch Port, PVID : 1, TPID : 8100(Hex), The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 3400-a305-2fe1
Port Mode: COMMON COPPER, Port Split: -
Speed: 1000, Loopback: NONE
Duplex: FULL, Negotiation: ENABLE
Mdi: AUTO, Flow-control: DISABLE
Last physical up time : 2014-12-06 10:25:37
Last physical down time : 2014-12-06 10:21:26
Current system time: 2014-12-06 10:32:57
Statistics last cleared:2014-12-06 10:06:21
Last 300 seconds input rate: 3460 bits/sec, 5 packets/sec
Last 300 seconds output rate: 180702 bits/sec, 26 packets/sec
Input peak rate 416731819 bits/sec, Record time: 2014-12-06 10:06:54
Output peak rate 2056954 bits/sec, Record time: 2014-12-06 10:06:54
Input : 3078271056 bytes, 1105836 packets
Output: 54742374 bytes, 523252 packets
Input:
Unicast: 915499, Multicast: 62
Broadcast: 715, Jumbo: 189560
Discard: 0, Frames: 0
Pause: 0
Total Error: 0
CRC: 0, Giants: 0
Jabbers: 0, Fragments: 0
Runts: 0, DropEvents: 0
Alignments: 0, Symbols: 0
Ignoreds: 0
Output:
Unicast: 503837, Multicast: 3135
Broadcast: 15899, Jumbo: 381
Discard: 0, Buffers Purged: 0
Pause: 0
Input bandwidth utilization threshold : 90.00%
Output bandwidth utilization threshold: 90.00%
Last 300 seconds input utility rate: 1.80%
Last 300 seconds output utility rate: 0.06%
3. 更換其他端口，問題依舊。
4. 該端口抓包發(fā)現(xiàn)，報文都是巨型幀，且?guī)缀跛袌笪亩家恢痹谥貍鳌?/span>
5. 查看服務(wù)器網(wǎng)卡配置，發(fā)現(xiàn)有一個功能是開啟的：Long Send Offload.
2. 查看交換機接口狀態(tài)，無錯包：
10GE1/0/14 current state : UP (ifindex: 18)
Line protocol current state : UP
Description:
Switch Port, PVID : 1, TPID : 8100(Hex), The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 3400-a305-2fe1
Port Mode: COMMON COPPER, Port Split: -
Speed: 1000, Loopback: NONE
Duplex: FULL, Negotiation: ENABLE
Mdi: AUTO, Flow-control: DISABLE
Last physical up time : 2014-12-06 10:25:37
Last physical down time : 2014-12-06 10:21:26
Current system time: 2014-12-06 10:32:57
Statistics last cleared:2014-12-06 10:06:21
Last 300 seconds input rate: 3460 bits/sec, 5 packets/sec
Last 300 seconds output rate: 180702 bits/sec, 26 packets/sec
Input peak rate 416731819 bits/sec, Record time: 2014-12-06 10:06:54
Output peak rate 2056954 bits/sec, Record time: 2014-12-06 10:06:54
Input : 3078271056 bytes, 1105836 packets
Output: 54742374 bytes, 523252 packets
Input:
Unicast: 915499, Multicast: 62
Broadcast: 715, Jumbo: 189560
Discard: 0, Frames: 0
Pause: 0
Total Error: 0
CRC: 0, Giants: 0
Jabbers: 0, Fragments: 0
Runts: 0, DropEvents: 0
Alignments: 0, Symbols: 0
Ignoreds: 0
Output:
Unicast: 503837, Multicast: 3135
Broadcast: 15899, Jumbo: 381
Discard: 0, Buffers Purged: 0
Pause: 0
Input bandwidth utilization threshold : 90.00%
Output bandwidth utilization threshold: 90.00%
Last 300 seconds input utility rate: 1.80%
Last 300 seconds output utility rate: 0.06%
3. 更換其他端口，問題依舊。
4. 該端口抓包發(fā)現(xiàn)，報文都是巨型幀，且?guī)缀跛袌笪亩家恢痹谥貍鳌?/span>
5. 查看服務(wù)器網(wǎng)卡配置，發(fā)現(xiàn)有一個功能是開啟的：Long Send Offload.
根因
服務(wù)器上的LSO特性是將巨型幀的封幀工作交給底層網(wǎng)卡，部分服務(wù)器在Windows 7 64位專業(yè)版上該功能有時會有問題。
解決方案
在服務(wù)器上關(guān)閉LSO特性。
建議與總結(jié)
網(wǎng)絡(luò)融合，會有越來越多的網(wǎng)絡(luò)問題出在服務(wù)器側(cè)，需要在定位時從多個方向入手，進行排查。
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