Tag Archives: delay

Google 研發出的 BBR: Congestion-Based Congestion Control

Google 針對 TCP 的 congestion control 研究出了新的方法,是個純 sender-side 的演匴法,可以讓現有的 internet 直接換上去使用:「[net-next,14/14] tcp_bbr: add BBR congestion control」。 在 long-lived TCP connection 愈來愈普及後 (像是 HTTP/2),TCP 連線的最佳化可以用統計模型來計算,這也就是 BBR 的想法: In a nutshell, BBR creates an explicit model of the network pipe by sequentially … Continue reading

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前幾天 Gmail 收信延遲的問題...

前幾天 Gmail 可以正常運作,但一直收不到信的問題由官方發公告出來解釋了:「More On Gmail’s Delivery Delays」。 官方宣稱,這次的問題出自於兩個獨立的網路同時掛掉,造成 Gmail 的收信處理能力大幅下降: The message delivery delays were triggered by a dual network failure. This is a very rare event in which two separate, redundant network paths both stop working at the same … Continue reading

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