[dpdk-dev] Polling too often at lower packet rates?
Paul Emmerich
emmericp at net.in.tum.de
Fri Apr 10 03:05:13 CEST 2015
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
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