4 ms·

Very interesting. Is such a thing configurable in Apache or nginx? It seems to be a rather rude behavior, but I'm curious how accessible it is.

• riffraff 16y ago
  I don't think any web server gets to this level of control on the tcp/ip level, this is something that should be addressed in the OS' network stack.
  • eru 16y ago
    Unless you have an exokernel operating system.
    • daeken 16y ago
      No need for an exokernel here. A microkernel could enable the same thing, since your network stack would be Yet Another Service (TM). This could easily be implemented on the likes of L4.
      • wmf 16y ago
        I don't really see the difference between patching the kernel and patching the privileged network stack server in a microkernel environment.
        • eru 16y ago
          In an exokernel environment, the network stack server wouldn't be privileged.
    • riffraff 16y ago
      Nah, that's not even necessary, I believe: the congestion window is a TCP feature, but any normal user space program (with a few privileges) can create IP datagrams with custom content, so you would only need to implement a bit of tcp in a normal old style monolithic kernel And since you control the only higher level protocol (your http implementation) you can probably cut some corners and get done quickly :)
      • panic 16y ago
        You may be able to create them, but as a server, how would you receive incoming connections?
• bstrong 16y ago
  It's not tunable at the app level. On linux it requires a kernel patch to change. I'm not sure about other OS's.
  • pquerna 16y ago
    I wish there was a patch where you could enable it on linux via a ioctl/setsockopt. Would be very useful to those of us who aren't google. Edit: I wished, google already sent the patch in May for this: http://www.amailbox.org/mailarchive/linux-netdev/2010/5/26/6278007 http://www.amailbox.org/mailarchive/linux-netdev/2010/5/26/6... Nice!
    • deleted 16y ago
      [deleted]
• 8plot 16y ago
  something like: ip route change default via 0.0.0.0 dev eth0 initcwnd 10
  • kragen 16y ago
    That doesn't seem to work for me: RTNETLINK answers: No such file or directory Apparently I need to patch my kernel?
    • zokier 16y ago
      slight offtopic: that's one of my favorite error messages that is actually relatively common.
  • self 16y ago
    Perhaps "ip route change default via <your gateway address> dev eth0 initcwnd 10" -- your gateway address, not 0.0.0.0.