[ECOS] FreeBSD Stack/ KeepAlive not working

[Richard Rauch]

Hi All,

first we find out, that the stack is not using the configured values for the
ticker from ecos ( e.g. CYGNUM_HAL_RTC_PERIOD ). The stack has fix values
for it in support.c:
int hz = 100;
int tick = 10000;  // usec per "tick"

We are working with a ticker of 250 us. So we have changed the values to
int hz = 4000;
int tick = 250;  // usec per "tick"


But now the KeepAlive-Time is over one hour. This is too much for our
application.
We found fix settings in tcp_timer.h for the values and changed it to:

#define	TCPTV_KEEP_INIT	( 10*hz)		/* initial connect keepalive */
#define	TCPTV_KEEP_IDLE	(15*hz)		/* dflt time before probing */
#define	TCPTV_KEEPINTVL	( 5*hz)		/* default probe interval */
#define	TCPTV_KEEPCNT	3			/* max probes before drop */

But now, when communication is idle on an established connection, the stack
is closing the connection after 20 seconds. We do not see a Keep Alive
Telegram on Ethernet.
What is wrong?


Thanks in advance

Richard



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