From 23fd8017a092dbb124c9c7a53ffe07bc8ddd2e1e Mon Sep 17 00:00:00 2001
From: Bernd <bernd@dfx.swiss>
Date: Sun, 1 Mar 2026 18:31:37 +0100
Subject: [PATCH] fix: optimize Firo node config for memory-constrained VM
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Reduce memory footprint to prevent swap thrashing on 3.8GB VM
running 5 blockchain containers:

firo.conf:
- dbcache: 512 → 256 MB (saves ~256 MB)
- maxmempool: 300 → 100 MB (saves ~200 MB)
- mempoolexpiry: 72 → 24 hours
- maxorphantx: 100 → 10 (reduces cs_main lock hold time)
- rpcworkqueue: 32 → 64 (more buffer before RPC rejection)
- maxsendbuffer/maxreceivebuffer: reduced per-connection buffers

docker-compose-firo.yml:
- Add 2048M memory limit / 1024M reservation
- Healthcheck: getblockcount instead of getblockchaininfo (lighter)
- Healthcheck interval: 30s → 120s, timeout: 60s → 10s, retries: 10 → 3
---
 .../config/docker/docker-compose-firo.yml       | 14 ++++++++++----
 infrastructure/config/firo/firo.conf            | 17 +++++++++++++----
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/infrastructure/config/docker/docker-compose-firo.yml b/infrastructure/config/docker/docker-compose-firo.yml
index 2826fb2259..3eecb5c835 100644
--- a/infrastructure/config/docker/docker-compose-firo.yml
+++ b/infrastructure/config/docker/docker-compose-firo.yml
@@ -4,16 +4,22 @@ services:
   firod:
     image: firoorg/firod:0.14.15.2
     restart: unless-stopped
+    deploy:
+      resources:
+        limits:
+          memory: 2048M
+        reservations:
+          memory: 1024M
     volumes:
       - ./volumes/firo:/home/firod/.firo
     ports:
       - '8168:8168'
       - '8888:8888'
     healthcheck:
-      test: firo-cli -conf=/home/firod/.firo/firo.conf getblockchaininfo || exit 1
+      test: firo-cli -conf=/home/firod/.firo/firo.conf getblockcount || exit 1
       start_period: 120s
-      interval: 30s
-      timeout: 60s
-      retries: 10
+      interval: 120s
+      timeout: 10s
+      retries: 3
     command: >
       -conf=/home/firod/.firo/firo.conf
diff --git a/infrastructure/config/firo/firo.conf b/infrastructure/config/firo/firo.conf
index f5f85522f3..3f141c0085 100644
--- a/infrastructure/config/firo/firo.conf
+++ b/infrastructure/config/firo/firo.conf
@@ -22,9 +22,18 @@ spentindex=0
 
 # Network
 onlynet=ipv4
-
-# Performance
-dbcache=512
 maxconnections=40
+
+# Mempool (defaults: maxmempool=300MB, mempoolexpiry=72h, maxorphantx=100)
+maxmempool=100
+mempoolexpiry=24
+maxorphantx=10
+
+# Performance (defaults: dbcache=450MB, rpcthreads=4, rpcworkqueue=16)
+dbcache=256
 rpcthreads=8
-rpcworkqueue=32
+rpcworkqueue=64
+
+# Per-connection buffer limits (value * 1000 bytes; defaults: send=1000, receive=5000)
+maxsendbuffer=500
+maxreceivebuffer=2000