kern/144917: Flowtable crashes system

[Ilya Zhuravlev]

On 21.03.2010 17:04, Evgenii Davidov wrote:
> Здравствуйте,
>
> On Sat, Mar 20, 2010 at 11:06:35PM +0000, Doychin Dokov пишет:
>
>>> Description:
>> It seems like flowtable has been merged and enabled by default in 8.0.... which is a really really bad idea.
>> On a system which handles two full BGP tables it makes one of the CPU cores run at 100% right after most of the prefixes get installed in the routing table.
>
> i saw the same effect with ospf
>

8.0-p2, 2 full-view with openbgpd
"tuning":
net.inet.tcp.blackhole=2
net.inet.udp.blackhole=1
net.inet.icmp.icmplim_output=0
net.inet.icmp.drop_redirect=1
net.inet.flowtable.nmbflows=32768

1 week uptime.Now I think only about increasing tx/rx descriptors to 
reduce interrupts (default values was not changed)


netstat -w1 -Iigb0
             input         (igb0)           output
    packets  errs      bytes    packets  errs      bytes colls
      49100     0   12290513      23693     0   27268884     0
      48322     0   12688283      24332     0   28099404     0
      50602     0   12759620      24437     0   27698341     0
      47857     0   11354124      21410     0   23845155     0

netstat -w1 -Iigb1
             input         (igb1)           output
    packets  errs      bytes    packets  errs      bytes colls
      32428     0   35027019      24562     0    5624934     0
      30621     0   33384339      23569     0    4456944     0
      28419     0   31014269      21571     0    3638083     0
      29409     0   32524760      22137     0    3503600     0
      30965     0   33532742      23973     0    5089231     0

netstat -w1 -Iem0
             input          (em0)           output
    packets  errs      bytes    packets  errs      bytes colls
      17217     0    3929366      72741     0   46377762     0
      17412     0    3745112      75522     0   49338883     0
      18385     0    4014568      77444     0   50532101     0
      17142     0    3875518      77125     0   47646681     0
      16870     0    3528316      73188     0   47940959     0
      17069     0    3682891      80268     0   52904747     0
      17313     0    4101576      75586     0   51933330     0