Weirdly high ping on direct ethernet connection?

Posted by Antriel on Super User See other posts from Super User or by Antriel
Published on 2012-09-05T08:42:49Z Indexed on 2012/09/05 9:40 UTC
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windows-7

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networking

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ping

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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