lundi, octobre 13, 2014

ipfw improvement on FreeBSD -current

Few days ago Alexander V. Chernikov posted on the FreeBSD -net mailing list an "HEADS UP: Merging projects/ipfw to HEAD" with lot's of promises:
  • Tables are now identified by names, not numbers. There can be up to 65k tables with up to 63-byte long names.
  • Tables are now set-aware (default off), so you can switch/move them atomically with rules.
  • More functionality is supported (swap, lock, limits, user-level lookup, batched add/del) by generic table code.
  • New table types are added (flow) so you can match multiple packet fields at once.
  • Ability to add different type of lookup algorithms for particular table type has been added.
  • New table algorithms are added (cidr:hash, iface:array, number:array and flow:hash) to make certain types of lookup more effective.
  • Table value are now capable of holding multiple data fields for different tablearg users
I'm not an expert of ipfw(8), but I would check the impact of this improved-ipfw on forwarding performance. By "performance" I mean how this code impact the throughput (in term of packet-per-second) of my FreeBSD firewall (I didn't bench all the parameters requiered by RFC3511).
Once the code was committed as r272840 on -head, I've generated a new nanobsd(8) image on my 10gigabit bench lab… and here are the results:


More than 100K pps of differences! Now I dream of an ipfw_sync equivalent to pf_sync(4).
And here are the ministat output for statistician extremists.
Regarding ipfw in stateless mode:


x 272685.ipfw-stateless
+ 273009.ipfw-stateless
+----------------------------------------------------------------------+
|x      x     x    x                                  + + +      +    +|
|   |______A__M___|                                                    |
|                                                     |___M__A_____|   |
+----------------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   5       1585928       1619817       1608891     1604564.2     12728.878
+   5       1683246       1712607       1690405     1695508.6      12250.89
Difference at 95.0% confidence
        90944.4 +/- 18219.1
        5.66786% +/- 1.13546%
        (Student's t, pooled s = 12492.2)

And regarding ipfw in statefull mode:


x 272685.ipfw-statefull
+ 273009.ipfw-statefull
+----------------------------------------------------------------------+
|xx    x   x    x                       ++   +    +                   +|
||_____A______|                                                        |
|                                    |_______M___A____________|        |
+----------------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   5       1390415       1433678       1407058     1408663.4     18451.472
+   5       1502719       1589778       1517320     1529871.8     35404.181
Difference at 95.0% confidence
        121208 +/- 41172.4
        8.6045% +/- 2.9228%
        (Student's t, pooled s = 28230.4)

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