Berkeley CSUA MOTD:Entry 53574
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2022/01/17 [General] UID:1000 Activity:popular
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2009/12/7-2010/1/3 [Computer/HW/Memory, Computer/HW] UID:53574 Activity:nil
12/7    How many TCP retransmits are too many? Here is what I get:
            3594143433 segments received
            3760174421 segments send out
            3801829561 segments retransmited
        \_ rephrase. you can never have too much money. or too little.
           what is, is.
           \_ You always get a few, but I have a bunch of squid servers that
              I just noticed have 500/second, which seems really high to me.
              They do about 20MB/sec at peak so this is a retransmit every
              40K? This is kind of hard to believe, because they are working
              fine.
              More details have been requested so here they are:
              Each server has apache and squid installed and serves about 10M
              requests/day out of memory in 5ms or less. They are configured
              as memory only squid servers. They are middle tier caching
              servers, sitting between an application layer and an API.
              They have 1Gb/sec uplinks to shared switches, which each have
              1 Gb uplinks to the core routers. No other servers on the
              switches are showing this behaviour and the switches themselves
              are not overloaded. Further investigation shows that 99% of
              the connections on the servers are sitting in TIME_WAIT, which
              I actually think is the cause of these retrans. I am still trying
              to figure out who is rudely dropping all their connections to
              these servers, but it is hard, since all traffic is through a load
              balancer (NetScaler).
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2022/01/17 [General] UID:1000 Activity:popular
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2009/10/27-11/3 [Computer/HW/Drives] UID:53474 Activity:nil
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8/29    There was once a CSUA web page which runs an SSH client for logging
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2012/1/4-2/6 [Computer/HW/Drives] UID:54281 Activity:nil
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2011/11/16-12/28 [Academia/Berkeley/CSUA, Computer/HW] UID:54230 Activity:nil
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