Hi,
Does anyone have an idea I can try?
On 11/27/2014 03:35 PM, Igor Romanovich wrote:
> Hi all,
>
> I'm working on a multi-threaded multi-interface high-throughput packet
> generator. The architecture consists of a number of producer threads,
> each (nearly) independently creating packets according to a reference
> model of packet flows. I've used PF_RING ZC successfully, using the
> standard libpcap API, just changing the interface to "zc:ethX". I had no
> problem with three producer threads, writing onto a single 10 Gbps
> interface. However I'm experiencing throughput limits, when using
> multiple interfaces, the sum of two interfaces reachs a maximum of 15-16
> Gbps, with three or more of producer threads.
>
> I reached the conclusion that maybe I can get a performance boost, using
> the native PF_RING ZC API (probably the burst API). To get familiar with
> the ZC API, before changing my own packet generator, I started with
> zsend.c, in the zc_examples folder, changed it to work with multiple
> threads and interfaces, and removed the unnecessary parts (code link is
> at end of message). Unfortunately, the threads start by writing out
> some packets, but after about a second, the system hangs in a deadlock
> where both threads are stuck in this loop (lines 411-420 in zsend.cpp):
>
> while ((sent_bytes = pfring_zc_send_pkt(zq[d],
> &buffers[threadIndex][d][buffer_id[d]], flush_packet)) < 0) {
> if (do_shutdown)
> break;
> if (!active)
> usleep(1);
> ....
> }
>
> On each round sent_bytes is negative and the packets don't get sent. I
> tried hard to find what has caused this, but I have no clue.
>
> To test this, please download the code file (link at end of message),
> and extract it. Then change line 486, appropriately:
>
> devices.push_back(string("zc:eth4"));
>
> And compile the code:
>
> make clean
> make
>
> Then run zsend like this:
>
> ./zsend -t 2
>
> That makes it create two producer threads, both writing on the interface
> specified on line 486.
>
> Any clue?
>
> The code is uploaded here: https://yadi.sk/d/K73fdfGicyBrq
>
> Best Regards,
> Igor
>
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