Author: bz
Date: Fri Dec 31 21:06:52 2010
New Revision: 216855
URL: http://svn.freebsd.org/changeset/base/216855
Log:
Move the increment operation under the lock and split the condition
variable into two so that we can see on which one we are waiting.
This might also more properly propagate the update of the
flowclean_cycles flag and avoid "hangs" people were seeing.
Suggested by: rwatson [1]
Sponsored by: ISPsystem [1]
Reviewed by: julian [1]
Updated by: Mikolaj Golub (to.my.trociny gmail.com)
Tested by: Mikolaj Golub (to.my.trociny gmail.com)
MFC After: 1 week
[1] Early 2010, initial version.
Modified:
head/sys/net/flowtable.c
Modified: head/sys/net/flowtable.c
==============================================================================
--- head/sys/net/flowtable.c Fri Dec 31 20:39:27 2010 (r216854)
+++ head/sys/net/flowtable.c Fri Dec 31 21:06:52 2010 (r216855)
@@ -195,7 +195,8 @@ static VNET_DEFINE(uma_zone_t, flow_ipv6
#define V_flow_ipv6_zone VNET(flow_ipv6_zone)
-static struct cv flowclean_cv;
+static struct cv flowclean_f_cv;
+static struct cv flowclean_c_cv;
static struct mtx flowclean_lock;
static uint32_t flowclean_cycles;
static uint32_t flowclean_freq;
@@ -951,7 +952,7 @@ flow_full(struct flowtable *ft)
if ((ft->ft_flags & FL_HASH_ALL) == 0)
ft->ft_udp_idle = ft->ft_fin_wait_idle =
ft->ft_syn_idle = ft->ft_tcp_idle = 5;
- cv_broadcast(&flowclean_cv);
+ cv_broadcast(&flowclean_c_cv);
} else if (!full && ft->ft_full) {
flowclean_freq = 20*hz;
if ((ft->ft_flags & FL_HASH_ALL) == 0)
@@ -1560,14 +1561,14 @@ flowtable_cleaner(void)
}
VNET_LIST_RUNLOCK();
- flowclean_cycles++;
/*
* The 10 second interval between cleaning checks
* is arbitrary
*/
mtx_lock(&flowclean_lock);
- cv_broadcast(&flowclean_cv);
- cv_timedwait(&flowclean_cv, &flowclean_lock, flowclean_freq);
+ flowclean_cycles++;
+ cv_broadcast(&flowclean_f_cv);
+ cv_timedwait(&flowclean_c_cv, &flowclean_lock, flowclean_freq);
mtx_unlock(&flowclean_lock);
}
}
@@ -1580,8 +1581,8 @@ flowtable_flush(void *unused __unused)
mtx_lock(&flowclean_lock);
start = flowclean_cycles;
while (start == flowclean_cycles) {
- cv_broadcast(&flowclean_cv);
- cv_wait(&flowclean_cv, &flowclean_lock);
+ cv_broadcast(&flowclean_c_cv);
+ cv_wait(&flowclean_f_cv, &flowclean_lock);
}
mtx_unlock(&flowclean_lock);
}
@@ -1613,7 +1614,8 @@ static void
flowtable_init(const void *unused __unused)
{
- cv_init(&flowclean_cv, "flowcleanwait");
+ cv_init(&flowclean_c_cv, "c_flowcleanwait");
+ cv_init(&flowclean_f_cv, "f_flowcleanwait");
mtx_init(&flowclean_lock, "flowclean lock", NULL, MTX_DEF);
EVENTHANDLER_REGISTER(ifnet_departure_event, flowtable_flush, NULL,
EVENTHANDLER_PRI_ANY);
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