fixed os freezes

os/platforms/v1/99-pikvm.conf

@@ -0,0 +1,3 @@
+# https://github.com/raspberrypi/linux/issues/1753
+vm.dirty_background_bytes = 5
+vm.dirty_writeback_centisecs = 25

os/platforms/v1/nginx.conf

@@ -18,7 +18,7 @@ http {
 	keepalive_timeout 10;
 	# gzip on;
 
-	upstream kvm_ws {
+	upstream kvmd {
 		server localhost:8081 fail_timeout=0s max_fails=0;
 	}
 
@@ -46,9 +46,26 @@ http {
 
 		location /kvm/ws {
 			rewrite /kvm/ws /ws break;
-			proxy_pass http://kvm_ws;
+			proxy_pass http://kvmd;
 			proxy_set_header Upgrade $http_upgrade;
 			proxy_set_header Connection "upgrade";
+			proxy_connect_timeout 7d;
+			proxy_send_timeout 7d;
+			proxy_read_timeout 7d;
+		}
+
+		location /kvm/msd/write {
+			rewrite /kvm/msd/write /msd/write break;
+			proxy_pass http://kvmd;
+			limit_rate 6250k;
+			limit_rate_after 50k;
+			client_max_body_size 0;
+			proxy_request_buffering off;
+		}
+
+		location /kvm {
+			rewrite /kvm/?(.*) /$1 break;
+			proxy_pass http://kvmd;
 		}
 
 		location /video {

os/platforms/v1/run.sh

@@ -5,14 +5,16 @@ set -x
 . ../functions.sh
 
 
-cp config.txt "$FS/boot/config.txt"
 pkg_install \
 	kvmd \
 	mjpg-streamer-pikvm \
 	nginx
 
+cp config.txt "$FS/boot/"
+cp 99-pikvm.conf "$FS/etc/sysctl.d/"
 cp index.html "$FS/srv/http/"
 cp kvmd.yaml "$FS/etc/"
 cp nginx.conf "$FS/etc/nginx/"
+
 rpi systemctl enable kvmd
 rpi systemctl enable nginx