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    SubjectRe: _High_ CPU usage while routing (mostly) small UDP packets

    Karsten Desler writes:

    > I totally forgot to mention: There are approximately 100k concurrent
    > flows.

    > >From dmesg:
    > IP: routing cache hash table of 16384 buckets, 128Kbytes

    You can take a looks at stats w. rtstat. Hash spinning and how many new
    entires create and how many warm you hit.

    > Maybe there is some contention on the rt_hash_table spinlocks?
    > Is the attached patch enough to increase the size?

    There is boot option for this now

    rhash_entries= [KNL,NET]
    Set number of hash buckets for route cache

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