[ovs-discuss] max mega flow 64k per pmd or per dpcls?

Bodireddy, Bhanuprakash bhanuprakash.bodireddy at intel.com
Thu Jun 29 14:23:51 UTC 2017

>I guess the answer is now the general LLC is 2.5M per core so that there is 64k
>flows per thread.

AFAIK, the no. of flows here may not have to do anything with LLC.  Also there is EMC cache(8k entries) of ~4MB per PMD thread.
Yes the performance will be nice with simple test cases (P2P with 1 PMD thread) as most of this fits in to LLC. But in real scenarios  OvS-DPDK can be memory bound.

BTW, on my DUT the LLC is 35MB and has 28 cores and so the assumption of 2.5M/core isn't right. 

- Bhanuprakash.

>On Fri, Jun 23, 2017 at 11:15 AM, Hui Xiang <xianghuir at gmail.com> wrote:
>Thanks Darrell,
>More questions:
>Why not allocating 64k for each dpcls? does the 64k just fit in L3 cache or
>anywhere? how it is calculated in such an exact number?  If there are more
>ports added for polling, for avoid competing can I increase the 64k size into a
>bigger one? Thanks.

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