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Slow(er) Ping Times

B

BChico

Platinum Member
Just got a new laptop and for some reason ping times are slower than when pinging the same server with the old laptop.

In some cases the new laptop is faster, while in some cases it is slower. This doesn't make any sense to me, as both laptops are connected to the same router at the same distance. The only difference would be the integrated wireless cards, but would that really make a difference?

Pinging Google 50 times with the old laptop yielded ~40ms while the new laptop yielded ~90ms. It seems like on the new laptop the pings increase in groups of four, i.e. 26, 56, 75, 110, and then will reset back down to 26.

I normally wouldn't care, but I am working with a database application that requires many calls to a centrally located database through a VPN. I am seeing differences of ~26 vs. ~60 on that server. The average isn't really the problem, its the peaking I see on the new laptop.

Any thoughts?

Brad
 
Could just be the difference in the quality of the radios in the wireless cards. Not only that but internet latency is highly variable and pings aren't a good indicator of latency as they are many times handled differently than normal traffic.
 
Originally posted by: spidey07
Could just be the difference in the quality of the radios in the wireless cards. Not only that but internet latency is highly variable and pings aren't a good indicator of latency as they are many times handled differently than normal traffic.
Click to expand...

They are both integrated Intel cards. IBM T42 vs. T61.

I ran trace routes on each, and they get the same ping times from the router to the ISP. After that is where the T61 latencies get much higher.
 
T 61:

C:\>ping www.google.com -n 10

Pinging www.l.google.com [72.14.205.99] with 32 bytes of data:

Reply from 72.14.205.99: bytes=32 time=240ms TTL=245
Reply from 72.14.205.99: bytes=32 time=222ms TTL=245
Reply from 72.14.205.99: bytes=32 time=50ms TTL=245
Reply from 72.14.205.99: bytes=32 time=74ms TTL=245
Reply from 72.14.205.99: bytes=32 time=95ms TTL=245
Reply from 72.14.205.99: bytes=32 time=119ms TTL=245
Reply from 72.14.205.99: bytes=32 time=38ms TTL=245
Reply from 72.14.205.99: bytes=32 time=61ms TTL=245
Reply from 72.14.205.99: bytes=32 time=29ms TTL=245
Reply from 72.14.205.99: bytes=32 time=107ms TTL=245

Ping statistics for 72.14.205.99:
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 29ms, Maximum = 240ms, Average = 103ms


T42:
C:\Documents and Settings\bkoehler>ping 72.14.205.99 -n 10

Pinging 72.14.205.99 with 32 bytes of data:

Reply from 72.14.205.99: bytes=32 time=43ms TTL=245
Reply from 72.14.205.99: bytes=32 time=43ms TTL=245
Reply from 72.14.205.99: bytes=32 time=41ms TTL=245
Reply from 72.14.205.99: bytes=32 time=33ms TTL=245
Reply from 72.14.205.99: bytes=32 time=35ms TTL=245
Reply from 72.14.205.99: bytes=32 time=44ms TTL=245
Reply from 72.14.205.99: bytes=32 time=45ms TTL=245
Reply from 72.14.205.99: bytes=32 time=29ms TTL=245
Reply from 72.14.205.99: bytes=32 time=44ms TTL=245
Reply from 72.14.205.99: bytes=32 time=43ms TTL=245

Ping statistics for 72.14.205.99:
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 29ms, Maximum = 45ms, Average = 40ms
 
Update drivers on new laptop, ping to your router inside address only. Run tests with only a single computer turned on as they will interact with eachother when on wireless.

This will tell you if it's wireless related/inside network or not.
 
Grabbing the drivers now.

Have tried with the other off, this has been driving me crazy...

The application I am working on makes ADO calls to a SQL Server DB through a VPN. With these random 200ms pings makes the app feel like shit.
 
Well then fix all the ping-pong going on with the application!!!!! It's not a network problem, the application is poorly written. 😉

In all honesty though, if this causes the application problems then it's a bad application.
 
Not really, when you are clicking through records quickly, a 250ms response time feels slow. Considering that it is over VPN and not the LAN its not that bad. Just annoying that I can get constant pings of 25ms on my other laptop.

Tried the driver, no dice.
 
Well with a VPN any fragmentation problems you may have will only be exaggerated by high latency and ping-pong. There are so many factors involved that it's impossible to do an application/fragmentation/latency analysis without packet captures.

I assume these pings are without a VPN even in the mix. Could still be wireless problem until you ping your local router and remove everything from the path.
 
Yeah tested without VPN, similar results while connected.

Same pings for first three hops. Latencies go up after than on the new laptop.
 
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