[#2158] policer: Reduce default cache size

We use cache to avoid policing the same object multiple times in a short
time span (< 30 seconds). If we have 200_000 objects in a blobstor, it is a bit useless
-- if it takes 1 second to process an object and we have `replicator.pool_size: 20`
in config, the next iteration will happen in 10_000 second which is much
larger than 30 second. However we still consume a lot of memory, so it
makes sense to use saner default.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

CHANGELOG.md

@@ -20,7 +20,8 @@ Changelog for NeoFS Node
 - `neofs-cli container get-eacl` print ACL table in json format only with arg `--json' (#2012)
 - Side chain notary deposits use max uint32 as till parameter (#1486)
 - Allow object removal without linking object (#2100)
-- `neofs-cli container delete` command pre-checks container ownership (#2106) 
+- `neofs-cli container delete` command pre-checks container ownership (#2106)
+- Policer cache size is now 1024 (#2158)
 
 ### Fixed
 - Open FSTree in sync mode by default (#1992)

pkg/services/policer/policer.go

@@ -99,7 +99,7 @@ func defaultCfg() *cfg {
 	return &cfg{
 		log:           &logger.Logger{Logger: zap.L()},
 		batchSize:     10,
-		cacheSize:     200_000, // should not allocate more than 200 MiB
+		cacheSize:     1024, // 1024 * address size = 1024 * 64 = 64 MiB
 		rebalanceFreq: 1 * time.Second,
 		evictDuration: 30 * time.Second,
 	}