[dpdk-dev] Polling too often at lower packet rates?

[Paul Emmerich]

Paul Emmerich <emmericp at net.in.tum.de> wrote:

> Stephen Hemminger <stephen at networkplumber.org> wrote:
> 
>> Your excess polling consumes PCI bandwidth which is a fixed resource.
> 
> I doubt that this is the problem for three reasons:
> 

4th: polling should not cause a PCIe access as all the required information is written
to memory by the NIC [1].

I only noticed that after I tried to measure the PCIe bandwidth caused by polling an X540
NIC... the result was 0 MBit/s ;)


Paul

[1] 82599 and X540 data sheets, Table 1-9