vsphere 6.5 host resources deep dive compute & network · rss & netqueue •nic support...
TRANSCRIPT
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vSphere 6.5 Host Resources Deep Dive
Compute & Network
D e n n e m a n & H a g o o r t
# N LV M U G
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Introduction
www.c loudf i x .n l
Niels Hagoort• F ree lance Arch i tect
• VMware VCDX #212
• VMware vExper t (NSX)
Frank Denneman• Sen io r S taf f Arch i tect
• VMware VCDX #29
• VMware vExper t
www.f rankdenneman.n l
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COMPUTE
N U M A – N U M A - N U M A
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Insights In Virtual Data Centers
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Modern Servers are
Non-Uni form Memory Access (NUMA)
Systems
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Local and Remote Memory Access
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NUMA Focus Points
• NUMA Conf igurat ion
• DIMM Types
• Size VM Match CPU Topology
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DIMM Per Channel
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Regions For Interleaving Memory
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3 DIMMs Per Channel Performance
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Memory Ranking
• DRAM Chips are Grouped in Ranks
• Ranks Create Elect r ica l Load
• Max 8 Ranks per Channel
• LRDIMMs Abstracts Ranks Using RCD Buffer
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DIMM Type Performance Impact
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RDIMM Performance
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LRDIMM Performance
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Performance Costs!
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CONSISTENCY IS KEY!
P e r f o r m a n c e S e c o n d
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Uneven NUMA Configurations
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Uneven NUMA Configurations
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Symmetric NUMA Configurations
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Asymmetric NUMA Nodes
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Unbalanced Channel Configuration
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Heterogeneous DIMM Configuration
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Today’s Sweet Spot!
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Right Size your VM
A l i g n m e n t r e s u l t s i n m o r e c o n s i s t e n t p e r f o r m a n c e
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ESXi CPU Schedulers
• CPU Scheduler Al locates Core or HT Cycles
• NUMA Scheduler In i t ia l Placement + LB
• VM vCPU Conf igurat ion Impacts IP & LB
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CPU + NUMA Scheduling Constructs
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Memory Footprint
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NUMA Scheduling Constructs
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NUMA Scheduling Constructs
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ESXi Pre-6.5 Cores Per Socket
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Defragmented Memory Address Space
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Defragmented Memory Address Space
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ESXi 6.5 Cores Per Socket
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ESXi 6.5 Cores Per Socket
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ESXi 6.5 Cores Per Socket
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Unifying the Cache
Align Cores Per Socket with Physical Core Count CPU Package
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Screenshot Cores per Socket
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Unifying the Cache
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Optimizing VM footprint
• VM Conf ig does not exceed NUMA Node Conf ig
• Use Cores Per Socket Wisely
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NETWORK
V X L A N – N E T P O L L – T x T H R E A D S
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pNIC VXLAN performance considerations
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• Addi t ional layer of packet processing
• Consumes CPU cyc les for each packet for
encapsulat ion/de-capsulat ion
• Some of the off load capabi l i t ies of the NIC cannot
be used (TCP based)
• VXLAN off loading! (TSO / CSO)
VXLAN
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1.
2.
3.
esxcl i network n ic get -n vmnicX
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esxcli system module parameters list –m bnx2x
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RSS & NetQueue
• NIC suppor t requ i red (RSS / VMDq)
• VMDq is the hardware fea tu re , Ne tQueue is the fea tu re baked in to vSphere
• RSS & NetQueue s im i la r in bas ic func t iona l i t y
• RSS uses hashes based on IP /TCP por t /MAC
• NetQueue uses MAC f i l t e rs
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Without RSS for VXLAN
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RSS enabled (>1 threads per pNIC)
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Receive network I/O with VXLAN
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“What is the maximum performance of the vSphere (D)vSwitch?”
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Network I/O CPU consumption
• By defaul t one t ransmit (Tx) thread per VM
• By defaul t , one receive (Netpol l ) thread per pNIC
• Transmit (Tx) and receive (Netpol l ) threads consume CPU cyc les
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Netpoll Thread
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Netpoll Thread Scaling
vsish
/> cat /wor ld /66076/name
“vmnic1 -pol lWor ldnetpol l [00]”
net-s tats -A - t vW
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Tx Thread
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• VMXNET3 is requi red!
• example for vNIC0:
ethernet0 .c txPerDev = "1 “
Additional Tx Thread
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Additional Tx thread
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Additional Tx thread
/> ca t /wor ld /194786/name
NetWor ld -VM-194786
/> ca t /wor ld /242681/name
NetWor ld -Dev-67108879-Tx
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• Transmi t (Tx) and rece ive ( Netpo l l ) th reads can be sca led !
• Take the ex t ra CPU cyc les fo r ne twork I /O in to accoun t !
Summary
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Shameless Plug (May 2017)
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Thanks!
@FrankDenneman
@NHagoort
@HostDeepDive