Hi,
I see a performance issue on win32. This problem is causes by the
following URL.
http://support.microsoft.com/kb/823764/EN-US/
On win32, default SO_SNDBUF value is 8192 bytes. And libpq's buffer is
8192 too.
pqcomm.c:117 #define PQ_BUFFER_SIZE 8192
send() may take as long as 200ms. So, I think we should increase
SO_SNDBUF to more than 8192. I attache the patch.
Regards,
--
Yoshiyuki Asaba
y-asaba@sraoss.co.jp
Index: pqcomm.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/libpq/pqcomm.c,v
retrieving revision 1.184
diff -c -r1.184 pqcomm.c
*** pqcomm.c 5 Mar 2006 15:58:27 -0000 1.184
--- pqcomm.c 27 Jun 2006 15:17:18 -0000
***************
*** 593,598 ****
--- 593,608 ---- return STATUS_ERROR; }
+ #ifdef WIN32
+ on = PQ_BUFFER_SIZE * 2;
+ if (setsockopt(port->sock, SOL_SOCKET, SO_SNDBUF,
+ (char *) &on, sizeof(on)) < 0)
+ {
+ elog(LOG, "setsockopt(SO_SNDBUF) failed: %m");
+ return STATUS_ERROR;
+ }
+ #endif
+ /* * Also apply the current keepalive parameters. If we fail to set a * parameter, don't
errorout, because these aren't universally
