1. 12 11月, 2010 1 次提交
    • D
      dlm: Handle application limited situations properly. · b36930dd
      David Miller 提交于
      In the normal regime where an application uses non-blocking I/O
      writes on a socket, they will handle -EAGAIN and use poll() to
      wait for send space.
      
      They don't actually sleep on the socket I/O write.
      
      But kernel level RPC layers that do socket I/O operations directly
      and key off of -EAGAIN on the write() to "try again later" don't
      use poll(), they instead have their own sleeping mechanism and
      rely upon ->sk_write_space() to trigger the wakeup.
      
      So they do effectively sleep on the write(), but this mechanism
      alone does not let the socket layers know what's going on.
      
      Therefore they must emulate what would have happened, otherwise
      TCP cannot possibly see that the connection is application window
      size limited.
      
      Handle this, therefore, like SUNRPC by setting SOCK_NOSPACE and
      bumping the ->sk_write_count as needed when we hit the send buffer
      limits.
      
      This should make TCP send buffer size auto-tuning and the
      ->sk_write_space() callback invocations actually happen.
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      Signed-off-by: NDavid Teigland <teigland@redhat.com>
      b36930dd
  2. 10 11月, 2010 2 次提交
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