[android] Is there any download speed limit for android device?

[qyzhaojinxi]

with the same wifi and the same torrent. The speed is often below 3M/s on android version and is up to 8M/s on Mac version.

I set speed limit is 0 by defaut. I can't find why.

[gubatron]

perhaps disk IO is way slower on the android device, CPU + Network interrupts, android's are less powerful devices than Mac's high quality hardware. However < 3M/s is weird.

I'd take a look at your session parameters, we do have some limitations for FrostWire on android in terms of max connections

[qyzhaojinxi]

        sp.set_str(settings_pack.string_types.listen_interfaces.swigValue(), ctx.interfaces);
        sp.set_int(settings_pack.int_types.max_retry_port_bind.swigValue(), ctx.retries);
        sp.set_str(settings_pack.string_types.dht_bootstrap_nodes.swigValue(), dhtBootstrapNodes());
        sp.set_int(settings_pack.int_types.active_limit.swigValue(), 2000);
        sp.set_int(settings_pack.int_types.stop_tracker_timeout.swigValue(), 0);
        sp.set_int(settings_pack.int_types.alert_queue_size.swigValue(), 5000);
        sp.set_bool(settings_pack.bool_types.enable_dht.swigValue(), ctx.enableDht);
        sp.set_bool(settings_pack.bool_types.enable_lsd.swigValue(), true);
        sp.set_bool(settings_pack.bool_types.enable_upnp.swigValue(), true);
        sp.set_bool(settings_pack.bool_types.enable_natpmp.swigValue(), true);

    private static String dhtBootstrapNodes() {
        StringBuilder sb = new StringBuilder();
        sb.append("dht.libtorrent.org:25401").append(",");
        sb.append("router.bittorrent.com:6881").append(",");
        sb.append("dht.transmissionbt.com:6881").append(",");
        // for DHT IPv6
        sb.append("router.silotis.us:6881");
        return sb.toString();
    }

 private static SettingsPack defaultSettings() {
        SettingsPack sp = new SettingsPack();
        //sp.broadcastLSD(true); //setting was deprecated/removed on libtorrent 1.2.4 (Feb 10th 2020)
        sp.validateHttpsTrackers(false);
        if (ctx.optimizeMemory) {
            int maxQueuedDiskBytes = sp.maxQueuedDiskBytes();
            sp.maxQueuedDiskBytes(maxQueuedDiskBytes / 2);
            int sendBufferWatermark = sp.sendBufferWatermark();
            sp.sendBufferWatermark(sendBufferWatermark / 2);
            sp.cacheSize(256);
            sp.activeDownloads(4);
            sp.activeSeeds(4);
            sp.maxPeerlistSize(200);
            //sp.setGuidedReadCache(true);
            sp.tickInterval(1000);
            sp.inactivityTimeout(60);
            sp.seedingOutgoingConnections(false);
            sp.connectionsLimit(200);
        } else {
            sp.activeDownloads(10);
            sp.activeSeeds(10);
        }
        return sp;
    }

  defaultValues.put(Constants.PREF_KEY_NETWORK_ENABLE_DHT, true);
        defaultValues.put(Constants.PREF_KEY_NETWORK_USE_WIFI_ONLY, false);

        defaultValues.put(Constants.PREF_KEY_TORRENT_SEED_FINISHED_TORRENTS, true);
        defaultValues.put(Constants.PREF_KEY_TORRENT_SEED_FINISHED_TORRENTS_WIFI_ONLY, true);

        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_DOWNLOAD_SPEED, 0L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_UPLOAD_SPEED, 0L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_DOWNLOADS, 10L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_UPLOADS, 20L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_TOTAL_CONNECTIONS, 1200L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_MAX_PEERS, 200L);
        defaultValues.put(Constants.PREF_KEY_TORRENT_DELETE_STARTED_TORRENT_FILES, false);
        defaultValues.put(Constants.PREF_KEY_TORRENT_TRANSFER_DETAIL_LAST_SELECTED_TAB_INDEX, 1); // pieces
        defaultValues.put(Constants.PREF_KEY_TORRENT_SEQUENTIAL_TRANSFERS_ENABLED, false);

[gubatron]

try setting ctx.optimizeMemory = false and see if it gets any faster

[qyzhaojinxi]

I already have set this.

 ctx.homeDir = paths.libtorrent();
            ctx.torrentsDir = paths.torrents();
            ctx.dataDir = paths.data();
            ctx.optimizeMemory = false;

            // port range [37000, 57000]
            int port0 = 37000 + new Random().nextInt(20000);
            int port1 = port0 + 10; // 10 retries
            String iface = "0.0.0.0:%1$d,[::]:%1$d";
            ctx.interfaces = String.format(Locale.US, iface, port0);
            ctx.retries = port1 - port0;

            ctx.enableDht = ConfigurationManager.instance().getBoolean(Constants.PREF_KEY_NETWORK_ENABLE_DHT);

[gubatron]

hmm, I think you'll have to profile the app and see if there's anything else eating up resources.

[gubatron]

such a dramatic slowdown feels like disk I/O. Is this happening with all android devices you're testing with? Maybe if you test with a more expensive device (top of the line Samsung or OnePlus) I'll be testing download performance for us in a few days and let you know if I find something.

[qyzhaojinxi]

Thank you. I will also test it on different devices.

[qyzhaojinxi]

Hi, find anything about this?