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matrix-tuwunel: update cache_capacity_modifier docs example for v1.7.0

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Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/5262

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Slavi Pantaleev
2026-05-21 22:20:15 +03:00
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docs/configuring-playbook-tuwunel.md
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@@ -140,15 +140,16 @@ The S3 backend ships with native multipart upload, so no goofys/rclone sidecar i
### RocksDB and cache tuning
Tuwunel embeds RocksDB. The defaults (`rocksdb_compression_algo: zstd`) suit most deployments. For high-throughput servers you may want to enable direct I/O, raise parallelism, and bump the cache modifier:
Tuwunel embeds RocksDB. The defaults (`rocksdb_compression_algo: zstd`) suit most deployments. For high-throughput servers you may want to enable direct I/O, raise parallelism, and configure a backup path:
```yaml
matrix_tuwunel_config_rocksdb_direct_io: true
matrix_tuwunel_config_rocksdb_parallelism_threads: 8
matrix_tuwunel_config_cache_capacity_modifier: 2.0
matrix_tuwunel_config_database_backup_path: /var/lib/tuwunel/backups
```
`matrix_tuwunel_config_cache_capacity_modifier` is left empty by default, so Tuwunel picks a value (`1.0` since v1.7.0, with rebalanced per-cache sizes that already raise memory use). Set it to `2.0` only on small hosts with four or fewer cores; on larger machines the default is recommended.
If you run on ZFS, the [Tuwunel maintenance guide](https://matrix-construct.github.io/tuwunel/maintenance.html#zfs) lists the dataset properties (`recordsize`, `primarycache`, `compression`, `atime`, `logbias`) and config flags (`rocksdb_direct_io`, `rocksdb_allow_fallocate`) you need to adjust to avoid severe write amplification.
To enable Sentry crash reporting, set `matrix_tuwunel_config_sentry_enabled: true`.