Re: [Ntop-misc] zcount displays less packets in zc mode

Moshe Danielli Thu, 03 Nov 2016 10:08:16 -0700

Hi Alfredo,

1. There's no point in distributing the interrupts as the user threads read directly from the NIC's memory ?

2. Can you give an example / reference to bounding the threads to different cpu cores ?

Thanks again !

On Nov 3, 2016 17:54, Alfredo Cardigliano wrote:
Hi Moshe
please note you can just ignore interrupts with ZC, just make sure you application threads are bound to the correct CPU cores in order to correctly spread the load.

Alfredo

On 2 Nov 2016, at 15:38, Moshe Danielli <[email protected]> wrote:

I understand... However, can we control the irq / core distribution of flows as we can with RSS (using smp_affinity)?

On Nov 2, 2016 15:56, Alfredo Cardigliano wrote:

Hi Moshe

RSS is an IP-based (IP+port for TCP) hw hash, if you need something more flexibly (e.g. a custom hash function) then you need zbalance_ipc.

Alfredo

On 2 Nov 2016, at 14:06, Moshe Danielli <[email protected]> wrote:

Hi Alfredo,

1. You were abosutely right - that was the exact reason. Once I switched to single queue mode, everything worked as expected.

2. Given Intel's RSS functionality - what is zbalance_irq doing different ? Why should I use it instead of making use of RSS ?

Thanks !

On Nov 2, 2016 12:03, Alfredo Cardigliano wrote:

Hi Moshe

do you have RSS enabled perhaps?

Please read the documents below:

https://github.com/ntop/PF_RING/blob/dev/doc/README.RSS

https://github.com/ntop/PF_RING/blob/dev/doc/README.apt_rpm_packages

Alfredo

On 2 Nov 2016, at 11:00, Moshe Danielli <[email protected]> wrote:

Hi Everyone,

I'm experiencing a weird situation where I'm running zcount twice:

1. zcount -i zc:em1

2. zcount -i em1

the first execution (zc mode) produces a count value of about 0.5 gbps while the 2nd execution (non zc mode) produces a value of about 4.5 gbps.

How is that possible ? what am I doing wrong ?

i'm using version 6.4.1-stable with 4096 ring slots and an intel 10g device (intel ixgbe 82599) on ubuntu 14.04.

Thanks in advance

_______________________________________________
Ntop-misc mailing list
[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
Ntop-[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
Ntop-[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
Ntop-[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

_______________________________________________
Ntop-misc mailing list
[email protected]
http://listgateway.unipi.it/mailman/listinfo/ntop-misc

Re: [Ntop-misc] zcount displays less packets in zc mode

Reply via email to