Martijn van Oosterhout wrote:

On Wed, Jun 28, 2006 at 12:23:13AM +0900, Yoshiyuki Asaba wrote:

I see a performance issue on win32. This problem is causes by the
following URL.

On win32, default SO_SNDBUF value is 8192 bytes. And libpq's buffer is
8192 too.

Ok, so there's a difficiency in Windows TCP code. Do you have any
benchmarks to show this actually makes a difference. According to the
URL you give, the problem occurs if the libpq buffer is *bigger* than
the socket buffer, which it isn't...

No, it says it occurs if this condition is met: "A single *send* call or *WSASend* call fills the whole underlying socket send buffer."

This will surely be true if the buffer sizes are the same. They recommend making the socket buffer at least 1 byte bigger.



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