[encointer] set target blocktime to 6s (#462)

Encointer communities could benefit from 6s block time because the
network is used for IRL point-of-sale or person-to-person transactions

Encointer is unaffected by
paritytech/polkadot-sdk#3268 as its pallets
have since ever based time on block timestamps

The parameters are copy-paste from people, as introduced by #308

---------

Co-authored-by: joe petrowski <[email protected]>

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Allow signed origins to send arbitrary XCMs from some system chains ([polkadot-fellows/runtimes#407](https:/polkadot-fellows/runtimes/pull/407))
 - Include the Core and Salary pallets into the Fellowship proxy ([polkadot-fellows/runtimes#454](https:/polkadot-fellows/runtimes/pull/454))
 - Add new community democracy and treasuries pallets to Encointer ([polkadot-fellows/runtimes#456](https:/polkadot-fellows/runtimes/pull/456))
+- Change target block time for Encointer to 6s ([polkadot-fellows/runtimes#462](https:/polkadot-fellows/runtimes/pull/462))
 
 ### Fixed
 

system-parachains/encointer/src/lib.rs

@@ -62,7 +62,9 @@ use frame_support::{
  ConstBool, ConstU128, ConstU64, Contains, EitherOfDiverse, EqualPrivilegeOnly,
  InstanceFilter, TransformOrigin,
  },
- weights::{ConstantMultiplier, Weight, WeightToFee as _},
+ weights::{
+ constants::WEIGHT_REF_TIME_PER_SECOND, ConstantMultiplier, Weight, WeightToFee as _,
+ },
  PalletId,
 };
 use frame_system::{
@@ -98,11 +100,7 @@ use sp_std::prelude::*;
 #[cfg(feature = "std")]
 use sp_version::NativeVersion;
 use sp_version::RuntimeVersion;
-use system_parachains_constants::{
- kusama::{consensus::*, currency::*, fee::WeightToFee},
- AVERAGE_ON_INITIALIZE_RATIO, DAYS, HOURS, MAXIMUM_BLOCK_WEIGHT, NORMAL_DISPATCH_RATIO,
- SLOT_DURATION,
-};
+use system_parachains_constants::kusama::{consensus::*, currency::*, fee::WeightToFee};
 use weights::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight};
 use xcm::{
  latest::prelude::{AssetId as XcmAssetId, BodyId},
@@ -292,15 +290,11 @@ impl frame_system::Config for Runtime {
  type PostTransactions = ();
 }
 
-parameter_types! {
- pub const MinimumPeriod: u64 = SLOT_DURATION / 2;
-}
-
 impl pallet_timestamp::Config for Runtime {
  /// A timestamp: milliseconds since the unix epoch.
  type Moment = Moment;
  type OnTimestampSet = EncointerScheduler;
- type MinimumPeriod = MinimumPeriod;
+ type MinimumPeriod = ConstU64<0>;
  type WeightInfo = weights::pallet_timestamp::WeightInfo<Runtime>;
 }
 
@@ -572,7 +566,7 @@ impl pallet_aura::Config for Runtime {
  type AuthorityId = AuraId;
  type DisabledValidators = ();
  type MaxAuthorities = MaxAuthorities;
- type AllowMultipleBlocksPerSlot = ConstBool<false>;
+ type AllowMultipleBlocksPerSlot = ConstBool<true>;
  type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 
@@ -752,6 +746,41 @@ construct_runtime! {
  }
 }
 
+/// This determines the average expected block time that we are targeting. Blocks will be
+/// produced at a minimum duration defined by `SLOT_DURATION`. `SLOT_DURATION` is picked up by
+/// `pallet_timestamp`, which is in turn picked up by `pallet_aura` to implement `fn
+/// slot_duration()`.
+///
+/// Change this to adjust the block time.
+pub const MILLISECS_PER_BLOCK: u64 = 6_000;
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+// Time is measured by number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+/// We assume that ~5% of the block weight is consumed by `on_initialize` handlers. This is
+/// used to limit the maximal weight of a single extrinsic.
+pub const AVERAGE_ON_INITIALIZE_RATIO: Perbill = Perbill::from_percent(5);
+/// We allow `Normal` extrinsics to fill up the block up to 75%, the rest can be used by
+/// `Operational` extrinsics.
+pub const NORMAL_DISPATCH_RATIO: Perbill = Perbill::from_percent(75);
+
+/// We allow for 2 seconds of compute with a 6 second average block time.
+pub const MAXIMUM_BLOCK_WEIGHT: Weight = Weight::from_parts(
+ WEIGHT_REF_TIME_PER_SECOND.saturating_mul(2),
+ polkadot_primitives::MAX_POV_SIZE as u64,
+);
+
+/// Maximum number of blocks simultaneously accepted by the Runtime, not yet included
+/// into the relay chain.
+pub const UNINCLUDED_SEGMENT_CAPACITY: u32 = 2;
+
+/// How many parachain blocks are processed by the relay chain per parent. Limits the
+/// number of blocks authored per slot.
+pub const BLOCK_PROCESSING_VELOCITY: u32 = 1;
+
 /// The address format for describing accounts.
 pub type Address = sp_runtime::MultiAddress<AccountId, ()>;
 /// Block type as expected by this runtime.