Apr 23, · In addition Hyper reading be reported as 'Disabled' in various configuration tabs. e current ESXi Side-Channel-Ae scheduler also addresses CVE--5407. SCAv2 is e only one to re-use core sharing (ESXi 6.7U2 only). It seams at e command is silently failing or worse has been silently disabled. Does anyone have a suggestion on how to fix. Not disabling hyper reading is not an option do to cost of cpu core licenses. I am running ESX 6.7. I would ra er not disable hyper reading for e physical host. 03, · Here is my first HINT, it shows we have 2 sockets, 8 cores and 2 read per core. at is unlikely and mostly in systems wi disabled hyper reading we would get 1 read per core Check e total number of physical CPUs. e following command will show how many active physical processors a system has. is read is archived. New comments cannot be posted and votes cannot be cast. Sort by. best. level. 7 points. 1 year ago. No. But wi e L1TF bug and e current VMe workaround, HT is effectively disabled. However, is has been implemented via a special new advanced configuration option (VMkernel.Boot.hyper readingMitigation), so. 24, · I set it to Enabled (ere is a message next to it saying, at Changes will not take effect until e host is restarted) and click OK. ere us a task showing up at e bottom named Enable Hyper reading which completes successfully and no ing changes - it remains Disabled and in e sum y tab Inactive. 08, · According to VMe (find it here), Hyper reading performance improvements are highly application-dependent, and some applications might see performance degradation wi hyper reading because many processor resources (such as e cache) are shared between logical processors. is does not necessarily mean at you should avoid. e VMe scheduler properly accounts for is halt time, and charges a virtual machine running wi e full resources of a core more an a virtual machine running on a half core. is approach to processor management ensures at e server does not violate any of . 21, · Hyper- reading Technology is a form of simultaneous multi reading technology introduced by Intel, while e concept behind e technology has been patented by Sun Microsystems. Architecturally, a processor wi Hyper- reading Technology consists of two logical processors per core, each of which has its own processor architectural state. 16, · We know at our hypervisor (vSphere) benefits greatly from hyper- reading and we were unae of any engineering defects in is feature. As for e second reason Microsoft had previously gave for disabling Hyper- reading, we simply told our customers to make sure ey consider only e physical cores in e physical server when ey are conducting sizing exercises. Totals: 544GB RAM, 96vCPUs and VMe hybrid vSAN. Server 1: HPE Proliant DL380 2U Server Gen 7 144GB RAM. 2 x 6 Core Intel Xeon X5660 @ 2.80GHz Processor (24 vCPUs wi Hyper reading enabled) 1 x ADATA 16GB USB Boot Drive (Located inside e server connected to an internal USB port). You can ei er disable Hyper- reading at e UEFI (BIOS) level, or dynamically, per-process, wi Process Lasso’s Hyper- readed Core Avoidance. e latter lets you restrict use of of non-physical cores to only applications at need real-time performance, wi out disabling Hyper- reading entirely, and for some older AMD architectures (e.g. Bulldozer) it is e only way to completely disable use of . 30, · Open e vSphere Web Client navigator and locate e particular host system, select e Manage tab and click Settings. Select Advanced System Settings in e System area and select e VMkernel.Boot.hyper reading entry. If e value is true, hyper- reading is enabled in vSphere 6. 08, · is is part 1 of 2 blogs at will cover how hyper- reading impacts virtual SAP sizing and performance. Many virtual SAP deployments leverage INTEL’s hyper- reading (HT) technology. For each processor core at is physically present, e hypervisor sees two logical processors and shares e workload between em when possible. A vCPU can be scheduled on . 19, · Using latest -jumbo code (commit 29f04d8) on Ubuntu 16.04.1 inside a VMe Workstation Pro 12 (12.5.2 build-4638234) VM: $ grep flags /proc/cpuinfo flags: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni . Windows Server Hyper-V defaults to using e core scheduler. To help ensure Hyper-V hosts are deployed in e optimal security configuration, Windows Server Hyper-V now uses e core hypervisor scheduler model by default. e host administrator optionally configure e host to use e legacy classic scheduler. VMe ESX Server 2.1 now fully supports Intel’s new Hyper- reading Technology (HT). is paper explains e changes at an administrator can expect to see when running ESX Server on a HT system and provides details on e advanced algori ms. 23, · If e Windows server has two 8-core Intel Xeon processors and hyper- reading is disabled, en Performance Monitor (PERFMON.EXE) will report 16 logical processors. If e Processor Time for e _Total instance is consistently between 40 and 50, en 6 to 8 active reads (on average) are executing each clock cycle. Feb 23, · To clarify, on pre-nehalem hyper- reading, it is recommended to disable it on BizTalk. Sometimes, it is more of an issue regarding e number of logical processors an e actual hyper reading. On nehalem hyper- reading, it is recommended to enable it and testing has shown a performance gain. We are unable to enable Hyper reading on ese servers. It is enabled in BIOS, CPU supports it, not disabled in boot loader OS: Suse 11 SP 2 64bit, 3..15. 02, · If is option is set to Disabled, e BIOS only displays one logical processor per core. By default, e Logical Processor option is set to Enabled. Understanding VMe vSphere wi Hyper- reading enabled. VMe states, ESXi hosts manage processor time intelligently to guarantee at load is spread smoo ly across processor cores in e system. demonstrate e potential performance impact of hyper- reading, bench k tests were run wi hyper- reading bo disabled and enabled. Hyper- reading Disabled Wi hyper- reading disabled, e physical syst em behaves like a traditional four-CPU server. e results are shown in Figure. e average run times remain almost constant for e. 16, · As per VMe suggestion, will go wi hyper reading enabled. All I know is it doubles e logical processors count Word-play, it only doubles e reads, at is all it will ever do. Well it is a LOT more an at. It takes a small latency hit in return for a massive roughput gain. 22, · If e Windows server has two 8-core Intel Xeon processors and hyper- reading is disabled, en Performance Monitor (PERFMON.EXE) will report 16 logical processors. If e Processor Time for e. We have a customer at insists at we need to turn off Hyper- reading wi in eir ESXi 5.5 enviroment to improve e performance of a 32bit app at ey use heavily. Me being e subject matter expert in regards to VMe, I'm not able to find any documentation at says its ok to do is, just documentation at states to keep it on. 14, · e main function of hyper- reading is to rease e number of dependent instructions on e pipeline. Hyper reading technology allows a single physical processor to behave like two logical processors.Al ough hyper reading does not double e performance of a system, it can increase performance by better utilizing idle resources. Try refreshing e page. Refresh. If e problem persists, contact Atlassian Support or your space admin wi e following details so ey can locate and troubleshoot e . VMe infrastructure is ok. No alerts/nings on ESX side. Time is set via ntp not VMe timekeeping (its disabled) ere are some long runing searches but ey are well distributed across e day (or ra er night). As said, concurrent searche during e day is . On VI3, many of VMe’s customers disabled Hyper- reading on eir older, Netburst architecture Intel processors. Intel has vaguely described e new Hyper- reading as more efficient an e. 14, · Google said it is disabling Hyper- reading by default in Chrome OS 74, citing security concerns, and noting at Chrome OS 75 will have additional mitigations. e ision to disable or enable Hyper- reading is a security versus performance tradeoff, said e web giant's people in a vulnerability notice. Wi Hyper- reading disabled. Figure 5 shows at when we enabled e hyper- reading, e OPM could be at 157k, and it downgraded to around 133k when it was disabled. Considering is is e optimal result after trying different read number of e test tool, at means disabling hyper- reading cannot benefit e performance, while enabling it can better use e CPU resources. Please refer to e documentation for your machine on how to disable Hyper- reading, or contact e manufacturer of e machine for instructions. Note: In e BIOS settings for some machines, Hyper- reading is sometimes named Logical Processor. Once Hyper- reading is disabled on e ESX Server machine, you need to modify boot parameters. (Client) Hyper-V is not listed anywhere in e Windows Features menu in my Windows 8 install. Toshiba Satellite L55t-A5232, Windows 8.1 Pro (Update 1), 8 GB RAM. Intel Core i7-4700MQ (Haswell, 4 -gen) VT-x is enabled in e UEFI firme. It does not support VT-d. e processor supports SLAT. I checked is using e coreinfo utility. 11, 2009 · Duncan, e vSpere FAQ.doc in e vSphere 4 Services Kit R3 states as a requirement for FT: o Turn off hyper reading (HT) in e BIOS. is ensures at a secondary VM does not have to share CPU cycles and can run fast enough to process e tasks already run on e pri y VM. , · is is correct, because is virtual server FS01, is being hosted by a VMe vSphere (ESXi) 5.5 Server. In is article, I’m going to take time out from writing a Basic VMe Article, and show you HOW TO: ENABLE and RUN Microsoft Hyper-V in a VMe vSphere Virtual Machine. You will find at running Microsoft Hyper-V virtual machines in a virtual machine does degrade performance . 01, · Hi! My problem here is very simple. I cannot use any reads from e hyper- reading of my CPU to use as extra cores on my VirtualBox VM. However, on VMe, I can do at, so why can't VirtualBox do it too?. I didn't try any steps as I don't know what to do, and people don't seem to have my problem when I search it up on e Internet. Find e virtual machine in e vSphere Web Client inventory.. To find a virtual machine, select a datacenter, folder, cluster, resource pool, or host. Click e Related Objects tab and click Virtual Machines.. Right-click e virtual machine and click Edit Settings.. In e Virtual Harde tab, expand e CPU section.. Select a hyper reading mode for is virtual machine from e HT Sharing. 16, · ere’s a fair bit of confusion around licensing SQL at is virtualized and I have been getting questions from customers about is for a long time now. e confusion comes from a few statements in e Microsoft SQL Server Virtualization Licensing Guide guide which states: For customers using Intel’s hyper- reading technology to split a single, physical core into . Apr 13, · Hyper- reading: When selecting a CPU for virtual Infrastructure it is important to know e features required in physical processor for better performance, Hyper- reading is one of ose feature which in some cases can boost up e performance by using CPU resources more efficiently and by allowing two different tasks to schedule execution resources on e same underlying physical core. Apr , · Doing a search online I see a few folks at bench ked eir ESX system wi HT turned off and on, and ey appear to have seen a performance benefit between 15-20. ere's also numerous whitepapers/KB from VMe at indicate enabling Hyper- reading is okay. However, ings are a bit more murky wi Hyper-V, and specifically for Server . On e CPU Power panel, statistics are arranged per physical CPU. A physical CPU is a physical harde execution context. It is e physical CPU core when hyper- reading is unavailable or disabled, or a logical CPU (LCPU or SMT read) when hyper- reading is enabled. 11, · He made a blanket statement at it is recommended at Hyper- reading should not be enabled. Funny at VMe recommends enabling it for single and dual socket boards and says it or not provide an improvement on quad socket boards and you should test before enabling in production. He also states at Ghz is Ghz. 12, · VMe refers to CPU as pCPU and vCPU. pCPU or ‘physical’ CPU in its simplest terms refers to a physical CPU core i.e. a physical harde execution context (HEC) if hyper- reading. Checks if any clusters has HA disabled. Check if any cluster has DRS disabled. Checks for Admission Control disabled on any cluster. Host Checks. Checks if HA is disabled on e individual Hosts. Checks for over 19 Physical Host harde issues. Checks if Hyper reading is disabled. Checks for CPU perfromance Issues: Usage and Contention. If hyper reading is on, turn it off. is reduce e number of logical cores enough to avoid needing to run in Multi Processor Group mode. If your machine has less an 64 logical cores and is running on a HP host, you be able to change e NUMA Group Size Optimization BIOS setting from e default of Clustered to Flat. 20, · OpenBSD has disabled Intel’s hyper- reading technology, citing security concerns – seemingly, Spectre-style concerns. As detailed in is mailing list post, OpenBSD maintainer k Kettenis wrote at SMT (Simultaneous Multi reading) implementations typically share TLBs and L1 caches between reads. is can make cache timing attacks a lot easier and we strongly suspect . Each Xeon E7-4890 v2 processor has 15 cores / 30 reads wi Hyper reading enabled for a total of 60 cores / 120 reads for e system. e diagram below shows e basic test configuration. In all tests Hyper- reading was enabled on e server, but in configurations where 60 vCPUs or less are assigned to e VM, Hyper- reads are not used.