I am not sure if it is the same problem, but I am now able to reproduce
slowness
if I use eclipse and debug something. It is annoying, but not fatal.
If I turn off TCP appropriate byte count:
sudo sysctl -w net.ipv4.tcp_abc=0
then the problem goes away. See RFC 3465
http://www.apps.ietf.org/rfc/rfc3465.html
for a description.
I have gotten massive strace's and the java VM is:
1) Turning on TCP_NODELAY
2) Sending small packets.
So I think we are counting the small packets now counting against it and
it getting
blocked. There are a several possible options:
1) Ship with TCP ABC = 0 off -- bad because no one ever changes things to be
more fair.
2) Ship with TCP ABC set 2 -- makes it more aggressive, that may work.
3) Tweak TCP to know more about the loopback interface so it has bigger cwnd
4) Fix java
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