From: Stephen Hemminger <shemminger@vyatta.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: [PATCH] bridge: fdb cleanup runs too often
Date: Tue, 15 Jun 2010 09:14:12 -0700 [thread overview]
Message-ID: <20100615091412.17e0d656@nehalam> (raw)
It is common in end-node, non STP bridges to set forwarding
delay to zero; which causes the forwarding database cleanup
to run every clock tick. Change to run only as soon as needed
or at next ageing timer interval which ever is sooner.
Use round_jiffies_up macro rather than attempting round up
by changing value.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
---
This is 2.6.35 bug fix, and should also be considered
for stable because of the performance impact.
--- a/net/bridge/br_fdb.c 2010-06-15 08:47:57.624465674 -0700
+++ b/net/bridge/br_fdb.c 2010-06-15 08:53:45.407855065 -0700
@@ -128,7 +128,7 @@ void br_fdb_cleanup(unsigned long _data)
{
struct net_bridge *br = (struct net_bridge *)_data;
unsigned long delay = hold_time(br);
- unsigned long next_timer = jiffies + br->forward_delay;
+ unsigned long next_timer = jiffies + br->ageing_time;
int i;
spin_lock_bh(&br->hash_lock);
@@ -149,9 +149,7 @@ void br_fdb_cleanup(unsigned long _data)
}
spin_unlock_bh(&br->hash_lock);
- /* Add HZ/4 to ensure we round the jiffies upwards to be after the next
- * timer, otherwise we might round down and will have no-op run. */
- mod_timer(&br->gc_timer, round_jiffies(next_timer + HZ/4));
+ mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
}
/* Completely flush all dynamic entries in forwarding database.*/
next reply other threads:[~2010-06-15 16:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-15 16:14 Stephen Hemminger [this message]
2010-06-17 20:55 ` [PATCH] bridge: fdb cleanup runs too often David Miller
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