Joe Breen. University of Utah. Center for High Performance Computing. What are User Expectations?. http://fasterdata.es.net/home/requirements-and-expectations/. What are the steps to attain the expectations?.
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Performance Troubleshooting across Networks
Presentation on theme: "Performance Troubleshooting across Networks"— Presentation transcript:
Performance Troubleshooting across Networks
Joe BreenUniversity of UtahCenter for High Performance ComputingSlide2
Are you shooting for 1G, 10G, 25G, 40G, 100G?Second, tune the hostmost are auto-tuning but higher speeds are still problematic
Third, validate network is clean between hostsFourth, make sure the network stays cleanSlide4
Motherboard specsHigher CPU speed better than higher core count
PCI interrupts tie to CPU processor ==> Try to minimize crossing bus between CPU processorsStorage Host Bus adapters and Network Interface Cards require the correct generation of PCI Express and the correct number of lanesSlide5
PCI busWhat generation of PCI Express (PCIe) and how many lanes?
4, 8, and16 lanes possible # of lanes supported depends on motherboard and Network Interface Card (NIC)
Speed of lane depends on generation of PCIePCIe 2 -> 2.5Gb/s per lane including overheadPCIe 3 -> 5Gb/s per lane including overhead Slide6
PCI ImplicationsPCIe v2 with 8 lanes and greater for 10G
PCIe v3 with 8 lanes and greater for 40GPCIe v3 with 16 lanes and greater for 100G +Slide7
Storage subsystem factorsLocal disk
RAID6, RAID5 or RAID 1+0 SATA or SAS
Spinning disk vs SSDNetwork diskHigh speed parallel system vs NFS or SMB mounts,Slide8
Host specs and other
Memory – 32GB or greaterOther factors such as multi-tenancy – how busy is your system?Slide9
TCP Buffers sets the max data rate
Too small means TCP cannot fill the pipeBuffer size = Bandwidth * Round Trip TimeUse ping for the RTT
Most recent Operating Systems now have auto-tuning which helpsFor high bandwidth, i.e. 40Gbps+ NICs, the admin should double-check the maximum TCP buffer settings (OS dependent)Slide10
High latency, with big pipesLatency is not just to the front door but also internal to the cloud providersExample: Backups to the cloud are a lot like big science flowsSlide24
Live example troubleshooting using bwctl on perfsonar boxes
Bwctl -s <server_ip> -c <client_ip>Slide25
See Notes pages on print out of slides for references for each slide
Performance Troubleshooting across Networks - Description
Joe Breen University of Utah Center for High Performance Computing What are User Expectations httpfasterdataesnethomerequirementsandexpectations What are the steps to attain the expectations ID: 658053 Download Presentation
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