Hello, ok, I found that cpu pinning was wrong, so I corrected it to be 1:1. The issue with iozone remains the same. The spec is running, however, it runs slower than 1-NUMA case. The corrected XML looks like follows: <cpu mode='host-passthrough'><topology sockets='8' cores='4' threads='1'/><numa><cell cpus='0-3' memory='62000000' /><cell cpus='4-7' memory='62000000' /><cell cpus='8-11' memory='62000000' /><cell cpus='12-15' memory='62000000' /><cell cpus='16-19' memory='62000000' /><cell cpus='20-23' memory='62000000' /><cell cpus='24-27' memory='62000000' /><cell cpus='28-31' memory='62000000' /></numa></cpu> <cputune><vcpupin vcpu='0' cpuset='0' /><vcpupin vcpu='1' cpuset='1' /><vcpupin vcpu='2' cpuset='2' /><vcpupin vcpu='3' cpuset='3' /><vcpupin vcpu='4' cpuset='4' /><vcpupin vcpu='5' cpuset='5' /><vcpupin vcpu='6' cpuset='6' /><vcpupin vcpu='7' cpuset='7' /><vcpupin vcpu='8' cpuset='8' /><vcpupin vcpu='9' cpuset='9' /><vcpupin vcpu='10' cpuset='10' /><vcpupin vcpu='11' cpuset='11' /><vcpupin vcpu='12' cpuset='12' /><vcpupin vcpu='13' cpuset='13' /><vcpupin vcpu='14' cpuset='14' /><vcpupin vcpu='15' cpuset='15' /><vcpupin vcpu='16' cpuset='16' /><vcpupin vcpu='17' cpuset='17' /><vcpupin vcpu='18' cpuset='18' /><vcpupin vcpu='19' cpuset='19' /><vcpupin vcpu='20' cpuset='20' /><vcpupin vcpu='21' cpuset='21' /><vcpupin vcpu='22' cpuset='22' /><vcpupin vcpu='23' cpuset='23' /><vcpupin vcpu='24' cpuset='24' /><vcpupin vcpu='25' cpuset='25' /><vcpupin vcpu='26' cpuset='26' /><vcpupin vcpu='27' cpuset='27' /><vcpupin vcpu='28' cpuset='28' /><vcpupin vcpu='29' cpuset='29' /><vcpupin vcpu='30' cpuset='30' /><vcpupin vcpu='31' cpuset='31' /></cputune> <numatune><memory mode='strict' nodeset='0-7'/></numatune> In this case, the first part took more than 1700 seconds. 1-NUMA config finishes in 1646 seconds. Hypervisor with 1-NUMA config finishes in 1470 seconds, the hypervisor with 8-NUMA config finishes in 900 seconds. On Fri, Sep 14, 2018 at 02:06:26PM +0200, Lukas Hejtmanek wrote: > Hello, > > I have cluster with AMD EPYC 7351 cpu. Two CPUs per node. I have performance > 8-NUMA configuration: > > This is from hypervizor: > [root@hde10 ~]# lscpu > Architecture: x86_64 > CPU op-mode(s): 32-bit, 64-bit > Byte Order: Little Endian > CPU(s): 64 > On-line CPU(s) list: 0-63 > Thread(s) per core: 2 > Core(s) per socket: 16 > Socket(s): 2 > NUMA node(s): 8 > Vendor ID: AuthenticAMD > CPU family: 23 > Model: 1 > Model name: AMD EPYC 7351 16-Core Processor > Stepping: 2 > CPU MHz: 1800.000 > CPU max MHz: 2400.0000 > CPU min MHz: 1200.0000 > BogoMIPS: 4800.05 > Virtualization: AMD-V > L1d cache: 32K > L1i cache: 64K > L2 cache: 512K > L3 cache: 8192K > NUMA node0 CPU(s): 0-3,32-35 > NUMA node1 CPU(s): 4-7,36-39 > NUMA node2 CPU(s): 8-11,40-43 > NUMA node3 CPU(s): 12-15,44-47 > NUMA node4 CPU(s): 16-19,48-51 > NUMA node5 CPU(s): 20-23,52-55 > NUMA node6 CPU(s): 24-27,56-59 > NUMA node7 CPU(s): 28-31,60-63 > > I'm running one big virtual on this hypervizor - almost whole memory + all > physical CPUs. > > This is what I'm seeing inside: > > root@zenon10:~# lscpu > Architecture: x86_64 > CPU op-mode(s): 32-bit, 64-bit > Byte Order: Little Endian > CPU(s): 32 > On-line CPU(s) list: 0-31 > Thread(s) per core: 1 > Core(s) per socket: 4 > Socket(s): 8 > NUMA node(s): 8 > Vendor ID: AuthenticAMD > CPU family: 23 > Model: 1 > Model name: AMD EPYC 7351 16-Core Processor > Stepping: 2 > CPU MHz: 2400.000 > BogoMIPS: 4800.00 > Virtualization: AMD-V > Hypervisor vendor: KVM > Virtualization type: full > L1d cache: 64K > L1i cache: 64K > L2 cache: 512K > NUMA node0 CPU(s): 0-3 > NUMA node1 CPU(s): 4-7 > NUMA node2 CPU(s): 8-11 > NUMA node3 CPU(s): 12-15 > NUMA node4 CPU(s): 16-19 > NUMA node5 CPU(s): 20-23 > NUMA node6 CPU(s): 24-27 > NUMA node7 CPU(s): 28-31 > > This is virtual node configuration: (i tried different numatune settings but > it was still the same) > > <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> > <name>one-55782</name> > <vcpu><![CDATA[32]]></vcpu> > <cputune> > <shares>32768</shares> > </cputune> > <memory>507904000</memory> > <os> > <type arch='x86_64'>hvm</type> > </os> > <devices> > <emulator><![CDATA[/usr/bin/kvm]]></emulator> > <disk type='file' device='disk'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.0'/> > <target dev='vda'/> > <driver name='qemu' type='qcow2' cache='unsafe'/> > </disk> > <disk type='file' device='disk'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.1'/> > <target dev='vdc'/> > <driver name='qemu' type='raw' cache='unsafe'/> > </disk> > <disk type='file' device='disk'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.2'/> > <target dev='vdd'/> > <driver name='qemu' type='raw' cache='unsafe'/> > </disk> > <disk type='file' device='disk'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.3'/> > <target dev='vde'/> > <driver name='qemu' type='raw' cache='unsafe'/> > </disk> > <disk type='file' device='cdrom'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.4'/> > <target dev='vdb'/> > <readonly/> > <driver name='qemu' type='raw'/> > </disk> > <interface type='bridge'> > <source bridge='br0'/> > <mac address='02:00:93:fb:3b:78'/> > <target dev='one-55782-0'/> > <model type='virtio'/> > <filterref filter='no-arp-mac-spoofing'> > <parameter name='IP' value='147.251.59.120'/> > </filterref> > </interface> > </devices> > <features> > <pae/> > <acpi/> > </features> > <!-- RAW data follows: --> > <cpu mode='host-passthrough'><topology sockets='8' cores='4' threads='1'/><numa><cell cpus='0-3' memory='62000000' /><cell cpus='4-7' memory='62000000' /><cell cpus='8-11' memory='62000000' /><cell cpus='12-15' memory='62000000' /><cell cpus='16-19' memory='62000000' /><cell cpus='20-23' memory='62000000' /><cell cpus='24-27' memory='62000000' /><cell cpus='28-31' memory='62000000' /></numa></cpu> > <cputune><vcpupin vcpu='0' cpuset='0' /><vcpupin vcpu='1' cpuset='2' /><vcpupin vcpu='2' cpuset='4' /><vcpupin vcpu='3' cpuset='6' /><vcpupin vcpu='4' cpuset='8' /><vcpupin vcpu='5' cpuset='10' /><vcpupin vcpu='6' cpuset='12' /><vcpupin vcpu='7' cpuset='14' /><vcpupin vcpu='8' cpuset='16' /><vcpupin vcpu='9' cpuset='18' /><vcpupin vcpu='10' cpuset='20' /><vcpupin vcpu='11' cpuset='22' /><vcpupin vcpu='12' cpuset='24' /><vcpupin vcpu='13' cpuset='26' /><vcpupin vcpu='14' cpuset='28' /><vcpupin vcpu='15' cpuset='30' /><vcpupin vcpu='16' cpuset='1' /><vcpupin vcpu='17' cpuset='3' /><vcpupin vcpu='18' cpuset='5' /><vcpupin vcpu='19' cpuset='7' /><vcpupin vcpu='20' cpuset='9' /><vcpupin vcpu='21' cpuset='11' /><vcpupin vcpu='22' cpuset='13' /><vcpupin vcpu='23' cpuset='15' /><vcpupin vcpu='24' cpuset='17' /><vcpupin vcpu='25' cpuset='19' /><vcpupin vcpu='26' cpuset='21' /><vcpupin vcpu='27' cpuset='23' /><vcpupin vcpu='28' cpuset='25' /><vcpupin vcpu='29' cpuset='27' /><vcpupin vcpu='30' cpuset='29' /><vcpupin vcpu='31' cpuset='31' /></cputune> > <numatune><memory mode='preferred' nodeset='0'/></numatune>) > <devices><serial type='pty'><target port='0'/></serial><console type='pty'><target type='serial' port='0'/></console><channel type='pty'><target type='virtio' name='org.qemu.guest_agent.0'/></channel></devices> > <devices><hostdev mode='subsystem' type='pci' managed='yes'><source><address domain='0x0' bus='0x11' slot='0x0' function='0x1'/></source></hostdev></devices> > > <devices><controller type='pci' index='1' model='pci-bridge'/><controller type='pci' index='2' model='pci-bridge'/><controller type='pci' index='3' model='pci-bridge'/><controller type='pci' index='4' model='pci-bridge'/><controller type='pci' index='5' model='pci-bridge'/></devices> > <metadata> > <system_datastore><![CDATA[/opt/opennebula/var/datastores/108/55782]]> </system_datastore> > </metadata> > </domain> > > If I run e.g., spec2017 on the virtual, I can see: > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 1350 root 20 0 843136 830068 2524 R 78.1 0.2 513:16.16 bwaves_r_base.m > 2456 root 20 0 804608 791264 2524 R 76.6 0.2 491:39.92 bwaves_r_base.m > 4631 root 20 0 843136 829892 2344 R 75.8 0.2 450:16.04 bwaves_r_base.m > 6441 root 20 0 802580 790212 2532 R 75.0 0.2 120:37.54 bwaves_r_base.m > 7991 root 20 0 784676 772092 2576 R 75.0 0.2 387:15.39 bwaves_r_base.m > 8142 root 20 0 843136 830044 2496 R 75.0 0.2 384:39.02 bwaves_r_base.m > 8234 root 20 0 843136 830064 2524 R 75.0 0.2 99:04.48 bwaves_r_base.m > 8578 root 20 0 749240 736604 2468 R 73.4 0.2 375:45.66 bwaves_r_base.m > 9974 root 20 0 784676 771984 2468 R 73.4 0.2 348:01.36 bwaves_r_base.m > 10396 root 20 0 802580 790264 2576 R 73.4 0.2 340:08.40 bwaves_r_base.m > 12932 root 20 0 843136 830024 2480 R 73.4 0.2 288:39.76 bwaves_r_base.m > 13113 root 20 0 784676 771864 2348 R 71.9 0.2 284:47.34 bwaves_r_base.m > 13518 root 20 0 784676 762816 2540 R 71.9 0.2 276:31.58 bwaves_r_base.m > 14443 root 20 0 784676 771984 2468 R 71.9 0.2 260:01.82 bwaves_r_base.m > 12791 root 20 0 784676 772060 2544 R 70.3 0.2 291:43.96 bwaves_r_base.m > 10544 root 20 0 843136 830068 2520 R 68.8 0.2 336:47.43 bwaves_r_base.m > 15464 root 20 0 784676 762880 2608 R 60.9 0.2 239:19.14 bwaves_r_base.m > 15487 root 20 0 784676 772048 2532 R 60.2 0.2 238:37.07 bwaves_r_base.m > 16824 root 20 0 784676 772120 2604 R 55.5 0.2 212:10.92 bwaves_r_base.m > 17255 root 20 0 843136 830012 2468 R 54.7 0.2 203:22.89 bwaves_r_base.m > 17962 root 20 0 784676 772004 2488 R 54.7 0.2 188:26.07 bwaves_r_base.m > 17505 root 20 0 843136 830068 2520 R 53.1 0.2 198:04.25 bwaves_r_base.m > 27767 root 20 0 784676 771860 2344 R 52.3 0.2 592:25.95 bwaves_r_base.m > 24458 root 20 0 843136 829888 2344 R 50.8 0.2 658:23.70 bwaves_r_base.m > 30746 root 20 0 747376 735160 2604 R 43.0 0.2 556:47.67 bwaves_r_base.m > > The CPU TIME should be roughly the same but huge differences are obvious. > > This is what I see on the hypervizor: > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 18201 oneadmin 20 0 474.0g 473.3g 1732 S 2459 94.0 33332:54 kvm > 369 root 20 0 0 0 0 R 100.0 0.0 768:12.85 kswapd1 > 368 root 20 0 0 0 0 R 94.1 0.0 869:05.61 kswapd0 > > i.e., kswapd is eating whole CPU. Swap is turned off. > > [root@hde10 ~]# free > total used free shared buff/cache available > Mem: 528151432 503432580 1214048 34740 23504804 21907800 > Swap: 0 0 0 > > Hypervisor is > [root@hde10 ~]# cat /etc/redhat-release > CentOS Linux release 7.5.1804 (Core) > > qemu-kvm-1.5.3-156.el7_5.5.x86_64 > > Virtual is Debian 9. > > > Moreover, I'm using this type of disks for virtuals: > <disk type='file' device='disk'> > <source file='/opt/opennebula/var/datastores/108/55782/disk.3'/> > <target dev='vde'/> > <driver name='qemu' type='raw' cache='unsafe'/> > </disk> > > If I keep cache='unsafe' and if I run iozone test on really big files (e.g., > 8x 100GB), I can see huge cache pressure on the hypervizor - all 8 kswapd are > running on 100 % percent and slowing things down. The disk under datastore is > NVME SSD Intel 4500. > > If I set cache='none', kswaps are on idle, disk writes are pretty fast, > however, with 8-NUMA configuration, writes slow down to less than 10MB/s as > soon as the size of written data is roughly the same as memory size in the virtual > node. iozone has 100 % CPU usage thereafter and it seems that it is traversing page > lists. If I do the same with 1-NUMA configuration, everything is ok except > performance penalty about 25 %. > > -- > Lukáš Hejtmánek > > Linux Administrator only because > Full Time Multitasking Ninja > is not an official job title -- Lukáš Hejtmánek Linux Administrator only because Full Time Multitasking Ninja is not an official job title _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
