This commit adds a new const to increase the max future messages allowed
from 100 to 1000, which is needed as during IBD a node with lots of
channels might receive many future messages.
The description for TXID in Label Transaction should include a note
that, in the case of GRPC, the TXID needs to be passed in little-endian
(reverse) byte order. A user passing the bytes in big-endian order is
met with an error message stating that the transaction is not found in
the wallet and no other information with which to troubleshoot.
* The maximal reduction in the probability is limited to 0.5 (previously
~0.05), such that we don't get too low apriori probabilities.
Otherwise, this may lead to a too strong selection of large (and maybe
expensive) channels. A two-hop path would get total probability
penalties of:
- 1000PPM/(0.6*0.6) = 2778 PPM in the unsaturated case
- 1000PPM/(0.6*(0.6*0.5)) = 5556 PPM in the saturated case, where the
second hop is saturated
The difference in PPM of 2778 PPM should be enough to bias towards the
first path.
* The smearing factor is reduced. Previously we had to keep a higher
smearing factor in order to make the capacity factor not go to zero
for high amounts, to still give a fully saturated channel a chance.
This is not needed anymore due to the capping to 0.5. A lower value of
the smearing factor lets us more precisely choose a capacity fraction
and the capacity factor is more neutral when it comes to intermediate
amounts.
We set a conservative default value for the capacity fraction, which
still has the effect of discarding exhausted channels, giving a
noticeable effect when about 90% of the capacity is being used.
We make the capacity factor configurable via an lnd.conf routerrpc
apriori parameter. The capacity factor trades off increased success
probability with a reduced set of channel candidates, which may lead to
increased fees. To let users choose whether the factor is active or not,
we add a config setting where a capacity fraction of 1.0 disables the
factor. We limit the capacity fraction to values between 0.75 and 1.0.
Lower values may discard too many channels.
