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I bought new Lenovo IdeaCentre H430 pc and I'm having problem with high pings. Windows 7 with on-board realtek NIC. Fresh install, fully updated, drivers installed from included CD. When I start pinging router (direct 1Gb ethernet connection, 1 hop), pings start at <1ms (which is fine) and after a while they jump to 300-1000ms.

I loaded up live ubuntu to test if the problem might be in HW. It's not, in ubuntu pings were always <1ms.

I also noticed that when I start using connection somehow, pings go down to 1ms, but go back up when I stop using it (tested by accessing live camera feed on LAN).

Power Options set to max performance. I disabled Interrupt Moderation on the NIC, didn't help. I tested it in the safe mode with networking, same problem there.

It slows down our client-server based programs and I have no idea what's causing it. All I could google up was that disabling Interrupt Moderation would help, it didn't though. Anyone had similar problems?

tl;nr: Computer is giving high pings to router when idle and normal pings when network is under load, it slows down our software significantly.

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Are you using a QoS on the router or any form of load balancing? – Dave Sep 5 '12 at 8:55
Hmm, didn't play with settings on router for ages, so if something is there then only the default stuff. Other computers in network don't have this problem though. – Antriel Sep 5 '12 at 8:56
Do you use any other network monitor tools on the PC - I got an Asus PC and part of the bloatware was a network monitor - this played havoc and gave some very odd and unexpected results. Also the firewall could be at fault. – Dave Sep 5 '12 at 9:00
I'm not aware of something like that being installed there. I tested it in safe mode with everything off and it didn't work properly either. – Antriel Sep 5 '12 at 9:05
Are you able to add a wireless dongle or similar - this may reduce where to investigate depending on the result. – Dave Sep 5 '12 at 9:55

To gather some interesting details, it will be useful that you test the following destinations :

  • you already tried to ping you router
  • you should try to ping your own network card
  • you should try to ping your loopback (

and tell if there is any difference. That will provide a way to tell where in the stack or in the driver is the problem, if it's not a QoS problem. Then we can start thinking again.

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up vote 0 down vote accepted

Problem was solved by installing different driver (not the one windows installed by default, nor the one included on the CD that came with the pc). Concretely driver for RTL8168E, while (as far as I can say) the actual NIC is RTL8167. It seems to work so far though.

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