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freetds - RE: [freetds] FreeBSD 5.0 performance problems with TCP_NOPUSH

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  • From: Peter Deacon <peterd AT iea-software.com>
  • To: FreeTDS Development Group <freetds AT lists.ibiblio.org>
  • Subject: RE: [freetds] FreeBSD 5.0 performance problems with TCP_NOPUSH
  • Date: Tue, 15 Mar 2005 00:35:19 -0800 (Pacific Standard Time)

On Tue, 15 Mar 2005, ZIGLIO, Frediano, VF-IT wrote:

I don't have FreeBSD to test with. What I did is to search on internet
an option similar to TCP_CORK. Some mails (4 year ago!!) reported that
newer behavior of TCP_NO_PUSH was equal to TCP_CORK. Today I tried to
search again and I found a patch that add support for TCP_CORK even to
FreeBSD... I don't know if this patch has been committed.

You tested that TCP_NOPUSH under FreeBSD 5.0 do not work correctly so
would be so kind to try with

/* Try to use TCP_CORK on *BSD */
#elif (defined(__FreeBSD__) || defined(__GNU_FreeBSD__) ||
defined(__OpenBSD__)) && defined(TCP_CORK)
#define USE_CORK 1

Hi Freddy,

That works fine on my FreeBSD 5.0 system.

FWIW here are the avaliable options from tcp.h

#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
#if __BSD_VISIBLE
#define TCP_MAXSEG 0x02 /* set maximum segment size */
#define TCP_NOPUSH 0x04 /* don't push last block of write */
#define TCP_NOOPT 0x08 /* don't use TCP options */
#endif

Have Fun!
Peter




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