Hello,

I discovered that iPhone has a problem with it's wifi. It has extremely high latency which I cannot explain why.

The problem:

Desktop computer is connected with Gigabit ethernet to the router
iPhone is connected with 802.11g WPA2 Wifi at the same router with perfect signal.

iPhone Jailbroken with pwnage tool, 1.1.4 fw, 3.9 bootloader.

Pinging from the desktop computer (or from anywhere else on the LAN):

ping 192.168.1.75

Reply from 192.168.1.75: bytes=32 time=55ms TTL=64
Reply from 192.168.1.75: bytes=32 time=79ms TTL=64
Reply from 192.168.1.75: bytes=32 time=511ms TTL=64
Reply from 192.168.1.75: bytes=32 time=22ms TTL=64
Reply from 192.168.1.75: bytes=32 time=1274ms TTL=64

As you can see these are high latency and extreme jittering (55ms->1274ms) with inconsistency and packet loss.

I have tried this on 5 different wifi routers and 2 different LANs and on all of them the problem still exist.

I have also tried it on my windows xp laptop's wifi as ad hoc connection and it was perfect with only 1ms average ping time, which is exactly how much it should be! So I guess there's an incompatibility with the iPhone's wifi implementation (software or hardware) and the router's wifi access point.

The problem is that iPhone is such a GREAT piece of hardware/software which I really LOVE, but with such high ping times the difference in web browsing/email etc is enormous.

In other words it could be so much faster if this bug was corrected!

I am a competent programmer and I know my fair share of networking, but I really cannot find what is going wrong here.

Can someone help pinpoint this problem and helpfully eliminate it?

Post your pings and router brand and model so we can at least see which one's have it and which one's do not.

Thanks in advance.

Heres my stats:

Reply from 192.168.1.102: bytes=32 time=122ms TTL=64
Reply from 192.168.1.102: bytes=32 time=42ms TTL=64
Reply from 192.168.1.102: bytes=32 time=167ms TTL=64
Reply from 192.168.1.102: bytes=32 time=88ms TTL=64

Average time: 104ms
0% Loss

With a Linksys WRT54GS Router connected with WPA Security.

Hope this helps,
james

Pinging 192.168.11.8 with 32 bytes of data:

Reply from 192.168.11.8: bytes=32 time=86ms TTL=64
Reply from 192.168.11.8: bytes=32 time=7ms TTL=64
Reply from 192.168.11.8: bytes=32 time=30ms TTL=64
Reply from 192.168.11.8: bytes=32 time=53ms TTL=64
Reply from 192.168.11.8: bytes=32 time=76ms TTL=64
Reply from 192.168.11.8: bytes=32 time=98ms TTL=64
Reply from 192.168.11.8: bytes=32 time=18ms TTL=64
Reply from 192.168.11.8: bytes=32 time=40ms TTL=64
Reply from 192.168.11.8: bytes=32 time=63ms TTL=64
Reply from 192.168.11.8: bytes=32 time=86ms TTL=64

Ping statistics for 192.168.11.8:
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 7ms, Maximum = 98ms, Average = 55ms

Router: Buffalo Airstation WHR-G54S

Also, I have noticed that there are times where my laptop will pick up a wireless router in the area while my iPhone will not. Perhaps the card just isn't as strong as it could be.

Originally Posted by Cekle

Also, I have noticed that there are times where my laptop will pick up a wireless router in the area while my iPhone will not. Perhaps the card just isn't as strong as it could be.

No this is not the case, I even tested this with the iPhone right beside the router (10 cm distance) and it didn't had any improvement. This is something irrelevant of the wifi signal. But when I do an AdHoc wifi connection for testing purposes with my laptop, the ping is at 1ms steady wither I am close or several meters away, or in low signal.

So this must be a bug (or a feature?) in the software/hardware of iPhone, still searching, let's hope we'll get on to something.

I have noticed the same thing some months ago but couldnt find an explanation at that time. I think i came across a thread at ipodtouchfans or some other ipod touch forum.