Snort mailing list archives
Re: Snort spikes to 100% CPU followed by network latency
From: Cody Brugh <cbrugh () gmail com>
Date: Fri, 23 May 2014 08:54:50 -0400
Russ, We did not change anything before this started happening... I did upgrade snort to the latest version once this happened but it continues to spike even after upgrading. This is starting to happen about every 2 or 3 days now... I've had a couple times where it fixes itself and snort CPU usage goes down. Other times it goes on for a long period and I end up killing the snort process. I already have the preprocessor sensitive_data commented out, however I do see this in my disablesid.conf (I used pulled pork to fetch VRT rules). pcre:fwsam pcre:MS\d{2}-\d* pcre:dce_iface Should I adjust the PCRE stuff maybe? Thanks! On Fri, May 23, 2014 at 8:09 AM, Russ Combs (rucombs) <rucombs () cisco com>wrote:
------------------------------ *From:* Cody Brugh [cbrugh () gmail com] *Sent:* Thursday, May 22, 2014 8:13 PM *To:* snort-users () lists sourceforge net *Subject:* [Snort-users] Snort spikes to 100% CPU followed by network latency Hello, We have been running snort in-line for over a year now with no issues in terms of latency or CPU usage. Recently (over the past month) snort will all of the sudden spike CPU usage up to 100% and network latency becomes real bad, 1000+ms. I am really not sure where to start on figuring out what is causing this. I am starting snort so it prints the alerts/drops on the console and don't see any specific rule that would be causing this. Any advise on this issue? * Did you change your Snort version or configuration around the time you started seeing the issue? How frequently does this occur? And when it happens does it resolve itself or do you restart or what? You can turn on PPM (config ppm ...) and enable the PPM rules (gid 134). That may catch the problem packet which you can log and examine for clues. Without any clues I'd first check for SDF and PCRE. If you have SDF (preprocessor sensitive_data) configured you can try commenting that out. If you have any pcre/O rules (PCRE override) you can try commenting those out too. Snort OS: CentOS, 64-bit o" )~ Version 2.9.6.1 GRE (Build 56) '''' By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team Copyright (C) 2014 Cisco and/or its affiliates. All rights reserved. Copyright (C) 1998-2013 Sourcefire, Inc., et al. Using libpcap version 1.0.0 Using PCRE version: 7.8 2008-09-05 Using ZLIB version: 1.2.3 DAQ version: 2.0.2 Thanks!
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Current thread:
- Snort spikes to 100% CPU followed by network latency Cody Brugh (May 22)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 23)
- Re: Snort spikes to 100% CPU followed by network latency Cody Brugh (May 23)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 23)
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- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 23)
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- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 23)
- Re: Snort spikes to 100% CPU followed by network latency Cody Brugh (May 23)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 23)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 28)
- Re: Snort spikes to 100% CPU followed by network latency Cody Brugh (May 28)
- Re: Snort spikes to 100% CPU followed by network latency Cody Brugh (May 28)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 28)
- Re: Snort spikes to 100% CPU followed by network latency Cody Brugh (May 28)
- Re: Snort spikes to 100% CPU followed by network latency Russ Combs (rucombs) (May 28)