On 03.07.2012 20:55, Luigi Rizzo wrote:
On Tue, Jul 03, 2012 at 08:11:14PM +0400, Alexander V. Chernikov wrote:
Hello list!
I'm quite stuck with bad forwarding performance on many FreeBSD boxes
doing firewalling.
...
In most cases system can forward no more than 700 (or 1400) kpps which
is quite a bad number (Linux does, say, 5MPPs on nearly the same hardware).
among the many interesting tests you have run, i am curious
if you have tried to remove the update of the counters on route
entries. They might be another severe contention point.
21:47 [0] m@test15 netstat -I ix0 -w 1
input (ix0) output
packets errs idrops bytes packets errs bytes colls
1785514 52785 0 121318340 1784650 0 117874854 0
1773126 52437 0 120701470 1772977 0 117584736 0
1781948 52154 0 121060126 1778271 0 75029554 0
1786169 52982 0 121451160 1787312 0 160967392 0
21:47 [0] test15# sysctl net.rt_count=0
net.rt_count: 1 -> 0
1814465 22546 0 121302076 1814291 0 76860092 0
1817769 14272 0 120984922 1816254 0 163643534 0
1815311 13113 0 120831970 1815340 0 120159118 0
1814059 13698 0 120799132 1813738 0 120172092 0
1818030 13513 0 120960140 1814578 0 120332662 0
1814169 14351 0 120836182 1814003 0 120164310 0
Thanks, another good point. I forgot to merge this option from andre's
patch.
Another 30-40-50kpps to win.
+u_int rt_count = 1;
+SYSCTL_INT(_net, OID_AUTO, rt_count, CTLFLAG_RW, &rt_count, 1, "");
@@ -601,17 +625,20 @@ passout:
if (error != 0)
IPSTAT_INC(ips_odropped);
else {
- ro.ro_rt->rt_rmx.rmx_pksent++;
+ if (rt_count)
+ ro.ro_rt->rt_rmx.rmx_pksent++;
IPSTAT_INC(ips_forward);
IPSTAT_INC(ips_fastforward);
cheers
luigi
--
WBR, Alexander
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