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Hello,
This patchset is part 4 of changes that accumulated in
recent time. It is for nf-next and should be applied when the
patches from part 1-3 are already applied. It contains extras
for the per-net tables.
All patches here come from the work
"ipvs: per-net tables and optimizations" last posted
on 19 Oct 2025 as v6, with the following changes:
Patch 1 comes from v6/patch 10 with added get_conn_tab_size() helper
Patch 2 comes from v6/patch 13 with added text for the commit
Patch 3 comes from v6/patch 14 with updated docs
As result, the following patches will:
* As the connection table is not with fixed size, show its current
size to user space
* Add /proc/net/ip_vs_status to show current state of IPVS, per-net
cat /proc/net/ip_vs_status
Conns: 9401
Conn buckets: 524288 (19 bits, lfactor -5)
Conn buckets empty: 505633 (96%)
Conn buckets len-1: 18322 (98%)
Conn buckets len-2: 329 (1%)
Conn buckets len-3: 3 (0%)
Conn buckets len-4: 1 (0%)
Services: 12
Service buckets: 128 (7 bits, lfactor -3)
Service buckets empty: 116 (90%)
Service buckets len-1: 12 (100%)
Stats thread slots: 1 (max 16)
Stats chain max len: 16
Stats thread ests: 38400
It shows the table size, the load factor (2^n), how many are the empty
buckets, with percents from the all buckets, the number of buckets
with length 1..7 where len-7 catches all len>=7 (zero values are
not shown). The len-N percents ignore the empty buckets, so they
are relative among all len-N buckets. It shows that smaller lfactor
is needed to achieve len-1 buckets to be ~98%. Only real tests can
show if relying on len-1 buckets is a better option because the
hash table becomes too large with multiple connections. And as
every table uses random key, the services may not avoid collision
in all cases.
* add conn_lfactor and svc_lfactor sysctl vars, so that one can tune
the connection/service hash table sizing
Julian Anastasov (3):
ipvs: show the current conn_tab size to users
ipvs: add ip_vs_status info
ipvs: add conn_lfactor and svc_lfactor sysctl vars
Documentation/networking/ipvs-sysctl.rst | 35 ++++
net/netfilter/ipvs/ip_vs_ctl.c | 247 ++++++++++++++++++++++-
2 files changed, 278 insertions(+), 4 deletions(-)
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2.53.0
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