This is interesting, can you find out the Wi-Fi tcp transmission and receive buffers sizes in Android ./init.rc? What happens if you increase the buffer sizes? The sizes are listed as min, normal and max.
Also, it seems that your file can't be downloaded. On 18 Jun 2013, at 09:54, RW wrote: > Hello folks, > > I had some issues concerning the TCP performance of android. First I had some > tests with an Nexus S were I first saw them, but since on this device there > was a costum kernel with a lot of changes in the TCP Stack, I used my Nexus 7 > to run the Tests. In my testbed I had just a server connected to a WIFI > access point and my tablet connected to that access point. > First you can see in the packet dumps, that some packets are obviously not > captured. However, the performance viewed from the server side is rather bad > also. > > In the same setup I used my laptop with the same test (just transferring a > file) and had good results, meaning a quite non varying transfer rate, linear > increasing sequence numbers, etc. > > So the question is why is androids TCP stack performing so badly compared to > the normal linux kernel. I guess the CPU of the Nexus 7 would be powerful > enough for a 3,5 MByte/s connection? > > Is this a known issue or can anybody confirm that behaviour? I used android > 4.2.2 if that matters. > > Packet dumps: > http://160.45.111.16:3100/tcp.zip > > Thanks, > RW > > -- > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel > --- > You received this message because you are subscribed to the Google Groups > "Android Linux Kernel Development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to android-kernel+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > -- -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel --- You received this message because you are subscribed to the Google Groups "Android Linux Kernel Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-kernel+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
