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question about pf_ring capturing packets making the network traffic reduce.
2314476218 at qq
Apr 29, 2016, 2:35 AM
Post #1 of 2 (582 views)
Permalink
Hi all,


We are using PF_ring to capture packets with 8 NIC in an redhat linux server, with 20 process for capturing and dumping packets. And PF_ring is in standard mode.
When we capture NIC one by one, then no packets is lossed, but if we capture all NIC concurrently, then one of the NIC will drop/discard packets and other NICs are working well, while the CPU usage is quite low. The traffic flow speed of the loss packet NIC will reduce from 600Mbps to 300Mbps.

Could you tell why this happen?
Re: question about pf_ring capturing packets making the network traffic reduce. [ In reply to ]
cardigliano at ntop
Apr 29, 2016, 8:27 AM
Post #2 of 2 (569 views)
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Hi
please let us see the output of top (press 1 after starting it) when running all the processes on 8 NICs.

Alfredo

> On 29 Apr 2016, at 11:35, sunday2000 <2314476218@qq.com> wrote:
>
> Hi all,
>
> We are using PF_ring to capture packets with 8 NIC in an redhat linux server, with 20 process for capturing and dumping packets. And PF_ring is in standard mode.
> When we capture NIC one by one, then no packets is lossed, but if we capture all NIC concurrently, then one of the NIC will drop/discard packets and other NICs are working well, while the CPU usage is quite low. The traffic flow speed of the loss packet NIC will reduce from 600Mbps to 300Mbps.
>
> Could you tell why this happen?
>
>
>
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