Snort mailing list archives
Re: var PKT_TIMEOUT in sfdaq.c
From: Michael Altizer <maltizer () sourcefire com>
Date: Wed, 29 Feb 2012 17:22:31 -0500
On 02/29/2012 05:00 PM, Guillaume Daleux wrote:
Snort does certain "idle work" (see snort.c:SnortIdle()) each time the DAQ acquire call returns. If you made the call fully blocking, it would only return in the case of an error/signal/breakloop, and that code would not execute [often enough] when the packet rate is too low.Hi all,We had some problems with snort and snort daq which use 100% of processing power. After debugging, we saw that our system had a lot of call to poll function.The function poll (call in daq) set with a default snort parameter (PKT_TIMEOUT = 1000) is called everytime and didn't respect this timeout of 1 second (maybe heisenbug because only one printf removed this problem).We want to ask you, why this parameter is set to 1000 ms and not -1 ? The poll function is called to wait packets so why the snort daq uses a timeout and not directly value -1 which would block until a packet arrive ?Can we patch snort and change PKT_TIMEOUT to -1 ? Thanks for your answer.
I do not know why the timeout was being ignored in your case, which seems to be the real issue. You have not mentioned which DAQ module you are using.
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Current thread:
- Re: Invalid protocol name for "ip_proto" rule option: "igmp" Lukas Matt (Feb 24)
- Re: Invalid protocol name for "ip_proto" rule option: "igmp" Joel Esler (Feb 24)
- var PKT_TIMEOUT in sfdaq.c Guillaume Daleux (Feb 29)
- Re: var PKT_TIMEOUT in sfdaq.c Michael Altizer (Feb 29)
- Re: var PKT_TIMEOUT in sfdaq.c Russ Combs (Feb 29)
- Re: var PKT_TIMEOUT in sfdaq.c Guillaume Daleux (Feb 29)
- Re: var PKT_TIMEOUT in sfdaq.c Russ Combs (Feb 29)
- var PKT_TIMEOUT in sfdaq.c Guillaume Daleux (Feb 29)
- Re: Invalid protocol name for "ip_proto" rule option: "igmp" Joel Esler (Feb 24)