mrmcmint wrote: » TCP ChimneyInformation about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008
hypnotoad wrote: » "If you are using the Microsoft Hyper-V technology to run virtual machines, no operating system will take advantage of TCP Chimney offload." Is that all we need to know for the exam?
RobertKaucher wrote: » I would bet that it is. But can you explain why?
hypnotoad wrote: » Im guessing because the NIC has no way of knowing which machine its trying to use chimney offload for. Am I right? I wish I knew.
RobertKaucher wrote: » I suspect that your conclusion is correct. With the Hypervisor between the host OS and the hardware I imagine there is no way for the NIC to natively communicate with any of the OSes, let alone the true VMs. But I am seeing so much contradictory information out there...::Baltijas Inform?cijas Tehnolo?ijas:: [FONT=verdana,geneva]Improved Virtual Networking Performance[/FONT] [FONT=verdana,geneva]The new Hyper-V leverages several new networking technologies contained in Windows Server 2008 R2 to improve overall VM networking performance. Two key examples are the new VM Chimney (also called TCP Offload) and the use of Jumbo Frames.[/FONT] [FONT=verdana,geneva]VM Chimney allows a VM to **** its network processing load onto the NIC of the host computer. This works the same as in a physical TCP Offload scenario, Hyper-V now simply extends this functionality into the virtual world. This benefits both CPU and overall network throughput performance, and it’s fully supported by Live Migration.[/FONT] [FONT=verdana,geneva]VM Chimney is disabled by default in Windows Server 2008 R2, primarily for short-term hardware compatibility reasons. But combined with compatible hardware, currently including vendors like Intel, VM Chimney significantly reduces the host server’s CPU burden when dealing with VM network traffic. This translates into better host system performance and a simultaneous boost to VM network throughput.[/FONT] [FONT=verdana,geneva]Like TCP Offloading, support for Jumbo Frames [/FONT] Perhaps the MS article is for pre-R2 versions of Server 2008 and Hyper-V?
RobertKaucher wrote: » Thank you for the post. I have found it informative and I'd like to thank you for writing!
hypnotoad wrote: » R2: Bare-metal to live-migration in about an hour (48 minute video from MS)http://mschnlnine.vo.llnwd.net/d1/edge/3/0/8/3/HVS2008R2BareMetalToLiveInAnHour_2MB_edge.wmv
stupidboy wrote: » You know it I am up on Thursday morning, I'll post anything useful that I can. This obviously means keeping well when the line of the NDA.
stupidboy wrote: » Seems like my brain is turning to mush! I had the 70-659 beta today not the 70-693 ... I've booked that in January (according to my candidate history). Thank god the pain ends today for a couple of weeks, I need a break my head is ready to explode.