在 LAN 裡把 TCP timestamps 關閉擠出頻寬

由於 TCP timestamps 會使得封包多 12 bytes,關掉後可以在 LAN 裡面擠出頻寬,是個小孩子不要亂學的方法:「Save Some Bandwidth By Turning Off TCP Timestamps」。

文章裡是在 10Gbps 網路上測試,看測出來的圖片也只是一點點 (不到 1%),但仍然是有提昇:

Results show that it's reasonable to turn off timestamps on 10GE interfaces, but keep in mind that it should be performed only in low latency networks.

沒必要就不要亂動 :o

This entry was posted in Computer, Murmuring, Network and tagged , , , , , . Bookmark the permalink.

2 Responses to 在 LAN 裡把 TCP timestamps 關閉擠出頻寬

  1. gugod says:

    想多擠出一些 throughput 的話也可以嘗試 UDT: http://udt.sourceforge.net/

  2. Xin Li says:


    x before
    + after
    +----------------------------------------------------------------------+
    | x x + |
    | x x + + |
    | x x + + |
    |x x x + + + + +|
    | |_M_A___| |_______AM_____| |
    +----------------------------------------------------------------------+
    N Min Max Median Avg Stddev
    x 10 9.38 9.4 9.39 9.393 0.0067494856
    + 10 9.45 9.49 9.47 9.467 0.011595018
    Difference at 95.0% confidence
    0.074 +/- 0.00891379
    0.787821% +/- 0.0948982%
    (Student's t, pooled s = 0.00948683)

Leave a Reply

Your email address will not be published. Required fields are marked *