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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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