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Negative Ping Response


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I'm having a really odd problem, the las few days I noted some hiccups while browsing. I performed a ping to my router and noted negative ping values, they appeared instantly. I then did a ping to my local NIC, with same results, reinstalled nvidia network drivers and disabled a bridge and QOS from the network options with same results. Then I performed a ping to loopback (, and still have the same problem.

C:\>ping loopback -t

Pinging mwg-001 with 32 bytes of data:

Answer from bytes=32 time=-14ms TTL=128Answer from bytes=32 time=-14ms TTL=128Answer from bytes=32 time<1m TTL=128Answer from bytes=32 time<1m TTL=128Answer from bytes=32 time=-14ms TTL=128Answer from bytes=32 time<1m TTL=128Answer from bytes=32 time<1m TTL=128Answer from bytes=32 time=-15ms TTL=128Answer from bytes=32 time=-15ms TTL=128Answer from bytes=32 time<1m TTL=128Answer from bytes=32 time<1m TTL=128Ping statistics for Packets: sent = 11, received = 11, lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = -14ms, Average = 390451565ms

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About the negative pings, I'm not a genius computer user, but I noticed the negative pings and connectivity issues as well. I therefore referred my problem to the great technical support in the wire- aka, the Internet.

Seems that AMD has some issues with their Dual-core processors. I found this, and variations of it on several sites: [my thanks to "Stanley" who postd this]

"I am guessing all or most of those experiencing negative ping times are using the new dual core AMD cpu line. There appears to be a bug in the CPU, which AMD will not directly admit to or identify publicly. Being a big fan of AMD for years I find this very unfortunate since this has been affecting the AMD based servers I manage at work and the home machines of myself and many other people I know.

After narrowing it down to the processor itself I started to put pressure on AMD for answers and was finally told to update the processor driver for all systems experiencing the problem. I did this at home last weekend and at work to almost a dozen servers and it has fixed the problem on ALL workstations and servers.

From my discussions with AMD I have pieced together the following likely issue with the dual core processors. It seems there is a timing issue between the two cores that slowly causes the timing to drift further and further apart between the two cores. This is why rebooting the machine temporarily fixes the syptoms; atleast for a couple of hours. The longer the system is up the worse the problem appears to get until simple tasks such as web browsing and copying files becomes untolerable.

Below is a link to AMD to get the latest processor driver which appears to correct the issue with the dual core processor.

www . amd . com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html

(sorry for the broken URL, the borad will not let me post a URL with less than 15 posts here under my belt)

For those that may feel this problem still resides on the network side I can only say in the past two months I have tried 5 different brand NICs (netgear, HP, linksys, d-link, and an older Compaq server NIC), 4 different switchs (Cisco 6513, Cisco 2950, Netgear, and D-Link), and tried a straight crossover cable between two computers and non had any affect on the problem. I have also experienced the problem on 3 different system boards (Compaq DL385, MSI K8N Neo4, and an Asus board. I have flashed the BIOS repeatedly on all these boards and the Neo4 ensured I was running the latest nForce4 drives. None of this troubleshooting has any affect on the problem.

In the past two or so months I have read about a lot of people having this problem but have not seen a fix for this posted anywhere so I am hoping this email can help at least one person save the months of meaningless troubleshooting I have to go through.

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