Not enough buckets for the number of active key/value pairs. Buckets are cheap.
Start with nBuckets = nActiveSessions / (BIHASH_KVP_PER_PAGE / 2) or some such
and increase the number of buckets as necessary...
HTH... Dave
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of chetan bhasin
Sent: Thursday, April 7, 2022 7:28 AM
To: vpp-dev <vpp-dev@lists.fd.io>
Subject: [vpp-dev] Query Regarding Bihash (VPP 2106)
Hi,
We are using bihash where key is 5 tuple of the packet. There are different
type of free list which are maintained and once an entry is allocated and
removed from a bihash that memory still remain with the bihash for future
usage.
The problem we are seeing is consistent growth in the memory of bihash even
after 24 hours of traffic , somehow memory is not coming in a stable situation.
Any suggestions here are really appreciated.
With 5 tuple and less buckets
Hash table 'abc_v4_flow_hash'
5260666 active elements 131072 active buckets
11 free lists
[len 2] 50214 free elts
[len 4] 58542 free elts
[len 8] 69288 free elts
[len 16] 74395 free elts
[len 32] 77187 free elts
[len 64] 53558 free elts
[len 128] 1 free elts
1788 linear search buckets
heap: 25363 chunk(s) allocated
bytes: used 2.33g, scrap 48.84m
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