Broadcom netxtreme ii and server 2012 r2 and hyper v issues. Note by default, vmq is disabled on the hyperv virtual switch for virtual machines that. After installing this hotfix, the server still crashed. Virtual machines lose network connectivity when you use. The virtual servers were up, we could connect to the console but we couldnt ping them and they couldnt ping out. Virtual machine queue vmq interface windows drivers. This is exactly the network card that i have in hyper v of my disaster recover servers. My client has a mix of server 2003, 2003 r2, and server 2008 r2 servers running on this hyper v server, some of which cannot even make user of vmqs if i am not mistaken.
Dec 03, 20 network speed issues in windows server 2012 r2 hyper v with broadcom nics. This first round of hardware is all dell m630 blades with the broadcom 57840s. Slow performance for hyper v vms when using vmq with broadcom nics by flo 4. When i disable vmq it goes back up to using the full bandwidth of the port. Virtual machines lose network connectivity when you use broadcom. Jan 02, 2019 by default, vmq is enabled by the broadcom network driver. In fact, windows will not use vmq even when it is enabled. Jul 24, 2015 why does hyperv have network issues with 1 gbe nics.
This entry was posted in hardware, system administrator, technology, windows server and tagged broadcom, hyper v broadcom vmq latency issue, hyper v, network latency, server 2012, virtual machine queues, vmq, windows server by nerd drivel. Broadcom netxtremee virtual function for hyperv drivers. Do you have hyperv host running on windows 2012r2 with. By clicking accept, you understand that we use cookies to improve your experience on our website. There is a known problem with the broadcom 1gb vmq implementation that is supposedly fixed in the latest drivers. Hyperv virtual machines vms hosted on a windows server 2008 r2 or. Server 2012 r2 hyper v slow vm with broadcom nic and vmq. Its almost 2018 and here i am disabling vmq for broadcom nic on a. And lesson learned, even with the latest drivers, broadcom network cards and hyperv lead to a lot of head banging. Most posts ive found just say update your drivers firmware and disable vmq. Networking configuration can make a real difference to hyperv performance. Learn to live with the fact that gigabit networking is slow and that 10gbe networking often has barriers to reaching 10gbps for a single test. The virtual machine queue architecture documentation describes the highlevel concepts of the vmq architecture. However i was upset to find that just the driverfirmware update on the broadcom nics didnt seem to make a difference.
Turn on vmq under hyper v settings for each vm which is already on by. Vmq on team interface breaking hyperv networking posted on march 20, 2017 march 27, 2017 by afinn i recently had a situation where virtual machines on a windows server 2016 ws2016 hyper v host could not communicate with each other. Do you have 1 gbe networking with vmq enabled or reenabled by updates. I had to deploy firmware and driver updates from dell to get the r730 to reliably talk on the network before. Vmq is enabled on a hyper v virtual switch only when the system is using 10gigabit or faster network adapters. The issue is so big that at one point a year or so ago when i deployed a new hyper v server with broadcomm nics my domain users were unable to use vpn properly due to a crippling network latency. Poor network performance on virtual machines on a windows server 2012 hyper v host if vmq is enabled. Went through again and confirmed vmq was off, at least via the gui for the physical nics and no luck. Jun 30, 2008 vmq lookahead split enabled wake on magic packet enabled wake on pattern match enabled. Vmq on team interface breaking hyperv networking aidan.
We did this on both hyper v hosts as they were setup. Mar 04, 2017 we had a weird issue where we randomly had virtual machines lose network connectivity from a windows 2012 r2 hyperv host server. Hyperv network performance issues with broadcom drivers. I am running the latest intel drivers off of the intel download website for windows server 2016. As such, most can be left in a default state with no ill effects. Mar 12, 2015 vmq enabled on broadcom nics has caused no end of grief over the last number of years for countless hyper v admins. Network performance in hyperv with vmq and nic teaming. Hi all, doing some testing, does anyone have any best practise implementing dell intel and broadcom nics with vmq s with windows 2008 r2 hyper v and 2012 the reason i ask is that on dell broadcom nics when you create a team you can enabled the hyper v mode which i understand uses vmq s for hyper. Added hyper v live migration features with basp teaming added new comprehensive configuration management to manage all mba enabled adapters from a single banner popup. May 07, 2015 vmq is enabled on a hyper v virtual switch only when the system is using 10gigabit or faster network adapters. This driver no longer causes a server crash while doing continuous upgradedowngrade of firmware. Virtual machine queue vmq overview windows drivers. Nic adapter driver custom advanced property pages not available with inbox. The one with the broadcom driver had vmq enabled, and even though it was disabled in hyper v, it still caused slowness.
Performance issues on hyperv vms with broadcom nics. Install broadcom netxtremee virtual function for hyper v driver for windows 10 x64, or download driverpack solution software for automatic driver installation and update. Plus we will only see performance gains from vmq in larger scale not smb. There are many machines out there running the out of date driver. This can happen if virtual machine queue vmq is enabled. Slow performance for hyperv vms when using vmq with. For the adapters used by the hyper v guest, right click and select properties. Vmq is a hyperv technique that allows spreading vms receive traffic among. This can happen if virtual machine queue vmq is enabled on the physical network adapter used by the vms. Slow copy performance to a hyperv guest on a host with a. What is the proper hyperv r2 with teamed broadcom bcm5709c. Do i lose anything major by disabling this vmq feature on all broadcom nics in the parent partition running hyper v 2008 r2 at 1 gbit speeds. Sep 29, 2016 slow copy performance to a hyper v guest on a host with a broadcom adapter if any of the root paths involved in the synchronization are running as guests on a hyper v server, it is important to check if the host machine is running with broadcom network interface cards nics. Finally in march of 2015 broadcom finally had a driver available that fixed the issues.
Find answers to network performance in hyperv with vmq and nic teaming from the expert community at experts exchange. Dec 01, 2009 i had 2 x broadcom bcm5708c netxtreme ii gige on my hyper v server. Traditionally, ethernet has a maximum frame size of 1500 bytes. Vmq is enabled on a hyperv virtual switch only when the system is using 10gigabit or faster network adapters. Promised myself never again with hyperv and broadcom mainly the broadcom part. Hyper v 2019 with 2019 vms slow network performance. This driver corrects an issue where network connectivity fails with 5715 based adapters in windows server 2008 x64. The cause is an issue with an outdated broadcom netextreme network adapter driver. Mar 25, 2015 find answers to network performance in hyper v with vmq and nic teaming from the expert.
Virtual machine queues and broadcom nic issues nerd drivel. Vmq on team interface breaking hyperv networking aidan finn. Microsoft has urged oems not to enable vmq on the standard 1 gbe nic thats commonly found in hypev hosts. We built a lot of features such as sriov support, dynamic vmq, extensible virtual switch etc. Slow copy performance to a hyper v guest on a host with a. Try disabling it if updating the nic drivers does not work. Originally when this server was put in last fall i was aware of the issue and immediately updated the broadcom driver and firmware. Broadcom gigabit nics and virtual machine queues vmq. Jul 28, 2014 vmq is enabled on a hyper v virtual switch only when the system is using 10gigabit or faster network adapters. Note the hyper v child partition is also known as a vm. From within the hyper v host i can also ping the virtual machine but i cant ping my workstation. The vmq interface supports microsoft hyperv network performance improvements in ndis 6. Server 2012 r2 hyperv slow vm with broadcom nic and vmq.
Kb2986895 vms lose network connection on ws2012 or. I came in to my position in march to build a hybrid cloud platform for a hosting company based on sc hyper v wap and the hardware had already been purchased. This can happen if virtual machine queue vmq is enabled on the. Access broadcom s customer support portal to obtain warranty information, find documentation and downloads, and answer other questions you might have. I have multiple ws 2012 with hyper v hosts and most of the guests have run ok because i used the builtin nic driver, not broadcom s. Only the cards firmware notices the difference which is what causes the.
Why does hyperv have network issues with 1 gbe nics. Even blew out the nic teams and just went with standalone nics, still slow. When you have hyperv running on microsoft windows server 2012 or. I know that vmq had been a huge problem with broadcom nics and hyper v in the past. Anyway, the problem came back roughly a month ago after working fine all that time, tried disabling vmq. Broadcom designates these network adapters as 57xx based chipsets. The key requirement to support dynamic vmq from nics is to allow dynamic change in vmq to processor affinity. The broadcom driver and management apps installer now provides the ability to select whether to enable the tcp offload engine toe in windows server 2008 r2 when only the netxtreme ii. This means that by disabling vmq on the broadcom network adapter, you are not losing network performance or any other benefits because this is the default. Microsoft windows assigns an rssvmq queue to a physical cpu core only. Virtual machines slow and sluggish broadcom network adapter vmq issue. Vmq virtual machine queue any issues leaving it disabled.
Even when a driver claims to fix the broadcom bug, vmq offers zero. It looks like politics of whos the root cause are going to make all of us suffer for another 6 months at least. This driver corrects an issue where network connectivity fails in windows server 2012 r2 after adding hyper v service. Jul 04, 20 regarding to the issue i mentioned in my post about the performance issues from hyperv vms when vmq is enabled, broadcom brought a driver fix for windows server 2012. What is virtual machine queue vmq, why do you need. Hyper v virtual machines vms hosted on a windows server 2008 r2 or windows server 2012 r2 server may exhibit slow network performance if broadcom network adapters are installed in the host. This section describes the ndis virtual machine queue vmq interface. Vmq is designed to improve network performance on vms by expediting the transfer of network data from the physical adapter to the appropriate vm, but it appears to have the opposite effect on certain broadcom network adapters, resulting in significantly decreased network performance on all vms that utilize a virtual switch bound to an affected adapter. The postlookahead buffer is the part of the packet that is inspected by the guest operating system. Install broadcom netxtremec virtual function for hyper v driver for windows 10 x64, or download driverpack solution software for automatic driver installation and update. Hyperv and broadcom 5708c nextreme ii gige dont play. Disabling vmq on hyperv parent partition with 1 gbit.
Why does hyper v have network issues with 1 gbe nics. There are two drivers implemented by microsoft hyper v to enable the sriov function. A nic driver can advertise support for dynamic affinity during its initialization and vmswitch can leverage that to optimize the processor utilization. Broadcom has been trying to fix this problem for over a year and they still havent licked it. But despite this request and the fact that it adds nothing. In many cases, whether or not a certain feature is enabled will make no difference in the performance of the nic. Nov 27, 2012 i have multiple ws 2012 with hyper v hosts and most of the guests have run ok because i used the builtin nic driver, not broadcom s. Hyper v advanced virtual machine network configuration. Vmq uses hardware packet filtering to deliver packet data from an external virtual machine network directly to virtual machines.
Broadcom netxtreme ii and server 2012 r2 and hyperv issues. Please make sure that all your drivers are uptodate. Update the driver to the current version for your adapter model. The vmq interface supports microsoft hyper v network performance improvements in ndis 6. A lot of the options are dependent on what youre doing with the particular link. However, you need to do this to work around the driver issue. Broadcom netxtremec virtual function for hyperv drivers. My shop currently uses teamed broadcom nics in pe710s for a hyper v cluster. Hyperv virtual machines packet loss with vmq enable. When a network device gets a frame that is larger than the configured mtu, the data is fragmented into smaller frames or dropped. An ethernet packet larger than 1500 bytes is called a jumbo frame. This product addresses a bsod which could occur while using vmq in a hyper v environment. Netxtreme ethernet network server adapters deliver the worlds best performing and most secure solutions for standard pcie nics and open compute project ocp adapters at 1102550100200gb with robust and marketleading features such as truflow, trumanage, and marketleading performance.
Aug 12, 2019 this driver is the latest available driver from broadcom. Sep 14, 2014 after working in the hypervisor team for few years, during windows 8 time frame, i decided to move back to networking as a lead, to lead the increased investments in networking. I have a lot of clients, with dell servers and broadcom nics, with hyperv on server 2012 r2. Hyperv advanced virtual machine network configuration vembu. Slow network access within virtual machines broadcom and. Hyperv installed correctly and all networking components now work. Network speed issues in windows server 2012 r2 hyper v with broadcom nics. Network speed issues in windows server 2012 r2 hyperv. That second link brings you to a microsoft site which will link you out again to driver.
Driver downloaded from dell broadcom corporation 29911 version 7. With vmq enabled on hyperv and the nic, it ran better. Even when a driver claims to fix the broadcom bug, vmq offers zero benefit on 1gb nics. Vmq is enabled on a hyper v virtual switch only when the system is using 10gigabit or. Hp broadcom 1gb driver for windows server x64 editions. At the moment it looks like the problem that i and others had experienced in the past with having vmq enabled on broadcom adapters is present with the inbox driver in r2 version 15. Some tell me that newer broadcom drivers solve it, but ive heard conflicting reports on.
Jan 23, 2019 rebooting the hyper v host will resolve the issue temporarily, and the hyper v guest servers will operate normally for some time. I have seen various issues regarding certain broadcom drivers, and hyper v on hp dell servers. After windows updated broadcom driver bsod has been real problem memory management, sometimes driver name related to this visible, bcmwl63a. Vmq lookahead split enabled wake on magic packet enabled wake on pattern match enabled.
Disabling vmq on broadcom nic members prior to creating the team has become standard for us regardless of the driver being from broadcom or dell. Finally resolved the issue after updating the driver and firmware again. The microsoft guidance is that vmq should be off on 1gbps nics. Check both the oem and the actual chipset manufacturer to see who has the newer driver version.
Broadcom designates these driver versions as 57 xx based chipsets. With the new firmware and drivers i have the ability to enable vmqs. Solved performance issues on hyperv vms with broadcom. Windows server 2016 networking part 3 optimizing network. In the figure, the miniport driver for the physical network adapter indicates received data up to the hyper v extensible switch component. Vmq is left enabled and causes performance and uptime issues. Hyperv virtual switch performance dynamic vmq alternate.
Added vmq support for netxtremeii 1g and 10g devices. Rebooting the hyper v host will resolve the issue temporarily, and the hyper v guest servers will operate normally for some time. A ping time between vms on the same host can be 60100ms and file copies painfully slow. I had to rebuild 3 hosts in 2 months due to vmq issues so we reached out to dell. The issue is supposed to be resolved by updating your network adapter driver to a version greater than 16. Apr 19, 2018 broadcom network adapters have a very big issue in windows with hyper v. Vmq virtual machine queue is a type of hardware packet filtering that delivers packet data from an outside virtual machine network directly to a virtualized host operating system. Most networking demands dont even bog down gigabit. Hey mav, you know the name of that truck driving school. You can have networking problems on a ws2016 hyperv virtual switch if vmq is left enabled on a nic teaming interface.
The miniport driver allocates the shared memory for the postlookahead buffer from the address space of the guest operating system that runs in a hyper v child partition. To do this, launch device manager and expand network adapters. This component acts as a network virtual service provider netvsp and provides services to support networking access by the hyper v child partitions. By default, vmq is enabled by the broadcom network driver. What is the proper hyper v r2 with teamed broadcom bcm5709c nics configuration vmq, toe, lso, cso, etc. I wasted 2 days trying to understand whats wrong and amost gave up till i read this article. The vms would just lose connectivity from the network. If you enjoyed this article, please consider sharing it. Tcpip and iscsi offload performance improvement in a congested network. Troubleshooting hyperv virtual servers with network issues.
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