Vasily Averin wrote:
Patrick McHardy wrote:
I don't like the NF_CT_PER_BUCKET constant. First of all, each
conntrack is hashed twice, so its really only 1/2 of the average
conntracks per bucket. Secondly, its only a default and many
people use nf_conntrack_max = nf_conntrack_htable_size / 2, so
using this constant for early_drop seems wrong.
Perhaps make it 2 * nf_conntrack_max / nf_conntrack_htable_size
or even add a nf_conntrack_eviction_range sysctl.
IMHO The number of conntracks checked in early_drop() have following restrictions:
- it should be not too low -- to decrease chances of transmission failures,
- it should be limited by some reasonable value -- to prevent long check delays.
Agreed.
Also I believe it makes sense to have it constant (how about NF_CT_EVICTION
name?) -- to have the same behaviour on various nodes. However I doubt strongly
that anybody will want to change this value. Do you think it is really required?
I don't know. The current behaviour will on average scan 16 entries.
For people manually tuning their hash to saner settings it will scan
a single entry. So we have a quite wide range of values already.
The single entry with sane hash settings is too little IMO, maybe use
some middle-ground, make it 8 by default as you did and rename the
constant. NF_CT_EVICTION_RANGE sounds fine.
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