[Snort-users] 100% Outstanding - what does that mean?

Bryan Arenal b.arenal at ...11827...
Mon Aug 9 16:47:54 EDT 2010


On Mon, Aug 9, 2010 at 09:14, Russ Combs <rcombs at ...1935...> wrote:
>
>
> On Mon, Aug 9, 2010 at 11:04 AM, Bryan Arenal <b.arenal at ...11827...> wrote:
>>
>> I just set up a new sensor and when checking its performance
>> statistics, I am seeing a couple of the interfaces with Outstanding at
>> 100%.  Here's the output from one of the interfaces:
>>
>> Aug  9 06:56:54 spock snort[1536]:
>>
>> ===============================================================================
>> Aug  9 06:56:54 spock snort[1536]: Packet I/O Totals:
>> Aug  9 06:56:54 spock snort[1536]:    Received:    202781012
>> Aug  9 06:56:54 spock snort[1536]:    Analyzed:            0 (  0.000%)
>> Aug  9 06:56:54 spock snort[1536]:     Dropped:            0 (  0.000%)
>> Aug  9 06:56:54 spock snort[1536]:    Filtered:            0 (  0.000%)
>> Aug  9 06:56:54 spock snort[1536]: Outstanding:    202781012 (100.000%)
>> Aug  9 06:56:54 spock snort[1536]:    Injected:            0
>> Aug  9 06:56:54 spock snort[1536]:
>>
>> ===============================================================================
>>
>> What exactly does that mean?  A google search shows a February email
>> from Matt Watchinski saying, "Outstanding means that packets never got
>> out of the ethernet card before they got dropped.  IE pcap didn't get
>> to them before they disappeared."  But the README.counts in the 2.9.0
>> beta documentation says "Outstanding indicates how many packets are
>> buffered awaiting processing."  So I suppose I'm a bit confused.  If
>> they're buffered, pcap has gotten to them, correct?  Can I see why
>> 100% of them are buffered and not processing?
>
> The DAQ changes things up a little with 2.9.0.  Which DAQ are you using and
> how is it configured?

That was actually a test box and I haven't done any additional
configuration to DAQ but I do see the same thing on one of my other
machines that's running 2.8.6.1.  And CPU utilization on that snort
process is near 0%.

Aug  9 11:23:33 spock snort[13693]:
===============================================================================
Aug  9 11:23:33 spock snort[13693]: Packet Wire Totals:
Aug  9 11:23:33 spock snort[13693]:    Received:    149221835
Aug  9 11:23:33 spock snort[13693]:    Analyzed:            0 (0.000%)
Aug  9 11:23:33 spock snort[13693]:     Dropped:         2338 (0.002%)
Aug  9 11:23:33 spock snort[13693]: Outstanding:    149219497 (99.998%)
Aug  9 11:23:33 spock snort[13693]:
===============================================================================

But other processes running on other interfaces are reporting normal
stats.  Looks like it's just regular HTTP traffic and not a whole lot
at that.

And thanks for the humor Justin and Marty! :-)

Regards,

Bryan




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