Re: Libpcap performance problem

[Giray Simsek <giray_simsek () hotmail com>]

Hi,
We are using version 1.6.2.
Regards,Giray

> From: anders.broman () ericsson com
> To: tcpdump-workers () lists tcpdump org
> Date: Wed, 28 Jan 2015 15:21:10 +0000
> Subject: Re: [tcpdump-workers] Libpcap performance problem
>
>
> Hi,
> What version of libpcap are you using? Version >= 1.5.3 uses TPACKET_V3 which may give an capacity increase.
> Regards
> Anders
>
> -----Original Message-----
> From: tcpdump-workers [mailto:tcpdump-workers-bounces () lists tcpdump org] On Behalf Of Giray Simsek
> Sent: den 28 januari 2015 15:58
> To: tcpdump-workers () lists tcpdump org
> Subject: [tcpdump-workers] Libpcap performance problem
>
> Hi,
> We are currently working on testing Linux network performance. We have two Linux machines in our test setup. Machine1 
> is the attacker machine from which we are sending SYN packets to Machine2 at a rate of 3million pps. We are able to 
> receive these packets on Machine2's external interface and forward them through the internal interface without 
> dropping any packets. So far no problems. However, when we start another app that captures traffic on Machine2's 
> external interface using libpcap, the amount of traffic that is forwarded drops significantly. Obviously, this second 
> libpcap app becomes a bottleneck. It can capture only about 800Kpps of traffic and only about 800Kpps can be 
> forwarded in this case. This drop in the amount of forwarded traffic is not acceptable for us.
> Is there any way we can overcome this problem? Are there any settings on Os, ixgbe driver or libpcap that will allow 
> us to forward all the traffic?
> Both machines are running Linux kernel 3.15.
> Thanks in advance.
> Giray                                           
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