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unissoft-bj / ihostsvc

system services & data services on ihost
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packet size =1280 #56

Open unissoft-bj opened 9 years ago

unissoft-bj commented 9 years ago

packet size = 1280

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michaelyin commented 9 years ago

is it possible to increase the 1400 bytes limit to a higher value in Chilli?

michaelyin commented 9 years ago

1400 bytes is a bit too low. Not good to the network throughput.

unissoft-bj commented 9 years ago

增加tun0的 mtu，不能解决问题

root@ihost:~# ip link set dev tun0 mtu 8920 root@ihost:~# ifconfig tun0 tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:172.16.0.1 P-t-P:172.16.0.1 Mask:255.255.0.0 UP POINTOPOINT RUNNING MTU:8920 Metric:1 RX packets:223520 errors:0 dropped:0 overruns:0 frame:0 TX packets:238029 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:47795906 (47.7 MB) TX bytes:122032730 (122.0 MB)

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结果

chilli只是把wlan0上收到的fragment frame换frame字段后放到了tun0上 虽然tun0的mtu很大，但在chilli环节并没有组装 iptables把fragment放到eth0上的过程未受到mtu值的影响 kernel把fragment组装，发给wms的过程未受到mtu值的影响 wlan0上的frame长度，取决于手机的网卡和ihost的网卡。ethernet标准mtu=1500

把8920分成7片，每片1280发过来；到ihost端每7片组装成一个包 到达次序问题（相对来说，8192的包不容易出现次序问题） 如果中间有1个fragment丢失，后续7片分组面临全部重新组合的问题 是否需要一个控制机制（7片次序、所属分组）；相当于我们自己在应用层做了一个fragment assembly的工作（chilli没有做assembly；kernel在tun0上做assembly时丢包） 还是用tcp取代udp，直接用tcp的控制机制

michaelyin commented 9 years ago

see folder wlsp@182.92.195.40:~/wms/0.1.1_tcp/

3 files:

wmRecorder-debug-tcp.apk: send tcp socket to wms app-debug.apk: send udp socket to wms

wms-0.1.1.war: new build support both udp and tcp recording. tcp listens to port 8001. If you tests on a system support speaker output, you should be hear those sounds recorded from phone.

michaelyin commented 9 years ago

182.92.195.40:9090

you can download it from web.

unissoft-bj commented 9 years ago

tcp方式正常，系统开销明显增加（之前的udp方式load average大概在0.3左右）

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unissoft-bj commented 9 years ago

没有tcp包发送时的load average image

michaelyin commented 9 years ago

uploaded app-debug_v10.apk which supports Android phone Version 2.3+

unissoft-bj commented 9 years ago

wms/0.1.1_tcp/app-debug_v11.apk 工作正常

4分半的歌，大概有4~5个地方有点卡 单个录音客户端，rock pro的load average约为1.0~1.1

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