[dpdk-dev] two different threads polls the same port, different queues, why the throughput is the same

Kyle Larose eomereadig at gmail.com
Mon Nov 14 07:13:25 CET 2016


On Mon, Nov 14, 2016 at 2:28 PM, 张伟 <zhangwqh at 126.com> wrote:
> Hi all,
>
>
> I have two threads process the packets with different ways. thread A (core 0) is very heavy, thread B (core 1) is very light.   If I just run each of them, their throughput is huge different with small packet. Thread A polls queue 0 of port 0, thread B polls queue 1 of port 0. If I run them at the same time, why thread A and thread B get same throughput. This makes me very confused. Does anyone have the same experience or know some possible reasons?
>

Can you give some examples with numbers? My first thought is that
maybe the two threads are contending for the same physical core. You
don't have any locking/critical sections, do you?
>
> Thanks,
> wei


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