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system: mount SD cards async with bounded dirty-page writeback #1535

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system: mount SD cards async with bounded dirty-page writeback #1535

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7 changes: 7 additions & 0 deletions overlay/etc/sysctl.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -11,3 +11,10 @@ net.core.somaxconn = 128

# Prevent orphaned TCP sockets in FIN_WAIT2 from accumulating indefinitely
net.ipv4.tcp_fin_timeout = 15

# Keep SD card writeback asynchronous but bounded: flusher kicks in at 512K
# dirty, writers are throttled at 4M. Without this, sync mounts serialize
# every write and card internal GC stalls propagate straight into the
# recorder/streamer path (dropped frames).
vm.dirty_background_bytes = 524288
vm.dirty_bytes = 4194304
3 changes: 2 additions & 1 deletion package/thingino-system/files/automount
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Expand Up @@ -69,7 +69,7 @@ do_mount() {
return 1
fi

if mount -t auto -o noatime,sync "$device_node" "$mount_point"; then
if mount -t auto -o noatime "$device_node" "$mount_point"; then
echo -c 240 -e "- Mounted $device_node to $mount_point"
else
echo -c 142 -e "Failed to mount $device_node to $mount_point" >&2
Expand All @@ -93,6 +93,7 @@ do_umount() {
if grep -qs "^$device_node " /proc/mounts; then
if umount -l "$mount_point"; then
echo -c 240 -e "- Unmounted $mount_point"
sync
else
echo -c 142 -e "Failed to unmount $mount_point" >&2
fi
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