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We suspect that it's due to Wireshark putting the driver in promiscuous mode thus bypassing any multicast filtering. On the PC with BCM5764M driver, when we turn on Wireshark, we don't experience any dropped packets. We suspect that the mutlicast packet is dropped at the time the hash table is being rebuilt. We found the programmers guide of that driver and at, page 64 - and the first thing the code does is clear the hash table before rebuilding it. We also found this issue on another PC and with BCM5764M driver.
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What we've observed in a network capture is that the dropped packet is just right next to an IGMP Join. We found same issue with dropping multicast packets on Intel 82579LM Gigabit Network Connection on a Dell Lattitude E6520 laptop. Message was edited by: jkazules (typed unicast in last paragraph instead of multicast) I thought maybe by bringing this to your attention, maybe Intel will take a closer look at the mulicast capabilities of this NIC and its drivers. Honestly, it seems that there is just a problem with the programming of the drivers, and that is why I am posting.
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The latest version of driver that you mention above (v.17) did significantly improve the speed, but we are still bogged down heavily when compared to the unicast session (unicast: 7 minutes, multicast: 130 minutes).Īnyway, I don't expect to get any suggestions on how to fix it here. The environment is a PXE boot to WinPE 2.1 (Vista) using the Vista drivers. Multicast runs fine with other model computers with different NICs. We have eliminated all the other possibilities such as network hardware and design. The more clients that are added to the multicast, the slower it gets. The problem we are having is that multicast is extremely slow. I have Altiris Deployment Solution and I am deploying images to my many Dell Optiplex 990's. I found this thread after scouring the Internet for similar issues to mine.
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Any ideas for things I could try to fix the issue?
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Since this is running under Windows 7 SP1 we obviously have different drivers but I'm wondering if the issue is related. Searching the Internet I've seen some postings of issues under Linux complaining about similar 82579LM adapter some more here: I've observed the same behavior on multiple laptop models by different vendors which contain the 82579LM adapter. I'm running the version 16.7 (latest) of the Intel Network Driversģ. With the 82579LM adapter I'm seeing approximately one lost packet every 25K-60K packets.ġ.
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When running the software on the laptop with the 82579LM adapter. Recently I installed the software on a newer model laptop which has a 82579LM network adapter. I've run the software on multiple laptops successfully in the past (older network adapters - e.g. I have a software application that runs on a laptop running Windows 7 SP1 which receives data at around 100Mbps via a UDP stream over a 1GbE connection.