Snort mailing list archives
Performance monitoring issues
From: Lee Saunders <lee.saunders () zynstra com>
Date: Fri, 6 Sep 2013 11:45:14 +0100
I've been starting performance monitoring on my setup, as there is unexpected drops appearing at one single installation (virtualized configuration so traffic profile pretty similar to other installation). The bandwidth is pre-filtered so is relatively small, certainly small enough to that drops are not currently expected. The first perculiarity is looking at perfmon I see patmatch-percent numbers in the range 70 - 300%, very high and not what I'd expect. Looking then at profile monitoring, I can't find much on how to read and act on the values. I'm currently running a test for the rules profiling, but a preprocessor profile based on total ticks sorting has raised a couple of queries. The output of a short run is repeated below. However, the rtn eval value, when looked at against other outputs on the web looks very high, at 622810 ms, but not clear this represents or how to improve it. There is also the implication from the output that this and rule tree eval are siblings of rule eval, but the % of parent then does not add up, with a value of around 170% - is there a known problem with how these are reported and a red herring? I'm at the outset of the tuning exercise, but its proving difficult to find resources which outline how to interpret these values and how to mitigate them. I'm assuming the top offending detect is influenced primarily by the rule definitions hence the rules profiling I'm currently doing, but some insight into minimizing the subtasks would be useful, and if any of the other preprocessors can influence. timestamp: 1378398556 Preprocessor Profile Statistics (all) ========================================================== Num Preprocessor Layer Checks Exits Microsecs Avg/Check Pct of Caller Pct of Total === ============ ===== ====== ===== ========= ========= ============= ============ 1 detect 0 10553 10553 873142 82.74 83.64 83.64 1 rule eval 1 10427 10427 752623 72.18 86.20 72.09 1 rule tree eval 2 21935 21935 750099 34.20 99.66 71.85 1 content 3 4836 4836 1449 0.30 0.19 0.14 2 pcre 3 19 19 1438 75.71 0.19 0.14 3 flags 3 8970 8970 656 0.07 0.09 0.06 4 byte_test 3 2929 2929 517 0.18 0.07 0.05 5 dsize_eq 3 3987 3987 402 0.10 0.05 0.04 6 flow 3 2021 2021 172 0.09 0.02 0.02 7 preproc_rule_options 3 1256 1256 88 0.07 0.01 0.01 8 uricontent 3 168 168 64 0.38 0.01 0.01 9 itype 3 318 318 40 0.13 0.01 0.00 10 flowbits 3 212 212 32 0.15 0.00 0.00 11 icode 3 285 285 14 0.05 0.00 0.00 12 file_data 3 123 123 5 0.04 0.00 0.00 13 byte_extract 3 6 6 3 0.52 0.00 0.00 14 isdataat 3 8 8 1 0.20 0.00 0.00 15 window 3 4 4 0 0.15 0.00 0.00 2 rtn eval 2 1039167 1039167 622810 0.60 82.75 59.66 2 mpse 1 10212 10212 87608 8.58 10.03 8.39 2 s5 0 9321 9321 86594 9.29 8.29 8.29 1 s5tcp 1 8062 6651 64012 7.94 73.92 6.1310 1 s5TcpState 2 6651 6651 46814 7.04 73.13 4.48 1 s5TcpData 3 1606 1606 5624 3.50 12.01 0.54 1 s5TcpPktInsert 4 1406 1406 4829 3.43 85.86 0.46 2 s5TcpFlush 3 1037 1037 2863 2.76 6.12 0.27 1 s5TcpProcessRebuilt 4 892 892 50297 56.39 1756.44 4.82 2 s5TcpBuildPacket 4 892 892 665 0.75 23.25 0.06 2 s5TcpNewSess 2 197 197 1075 5.46 1.68 0.10 3 ssl 0 2090 2090 20935 10.02 2.01 2.01 4 decode 0 9853 9853 20088 2.04 1.92 1.92 5 sensitive_data 0 162 162 14964 92.37 1.43 1.43 6 eventq 0 20562 20562 6610 0.32 0.63 0.63 7 smtp 0 3748 3748 5387 1.44 0.52 0.52 8 httpinspect 0 3782 3782 5162 1.36 0.49 0.49 9 DceRpcMain 0 2865 2865 3518 1.23 0.34 0.34 1 DceRpcSession 1 2865 2865 2745 0.96 78.01 0.26 1 DceRpcNewSession 2 2865 2865 1584 0.55 57.72 0.15 10 perfmon 0 10721 10721 3119 0.29 0.30 0.30 11 ssh 0 2433 2116 1805 0.74 0.17 0.17 12 pop 0 3707 3707 1434 0.39 0.14 0.14 13 imap 0 3707 3707 1254 0.34 0.12 0.12 14 sip 0 3692 3692 842 0.23 0.08 0.08 15 modbus 0 3707 3707 692 0.19 0.07 0.07 16 dnp3 0 1259 1259 572 0.46 0.05 0.05 17 backorifice 0 1259 1259 437 0.35 0.04 0.04 18 dns 0 820 820 164 0.20 0.02 0.02 total total 0 9835 9835 1043957 106.15 0.00 0.00 ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Performance monitoring issues Lee Saunders (Sep 06)
- Re: Performance monitoring issues Joel Esler (Sep 06)
- Re: Performance monitoring issues Lee Saunders (Sep 06)
- Re: Performance monitoring issues Lee Saunders (Sep 12)
- Re: Performance monitoring issues Lee Saunders (Sep 06)
- Re: Performance monitoring issues Joel Esler (Sep 06)