[vfio-users] guest GPU p2p doesn't work
Igor Varfolomeev
i3v at mail.ru
Fri Jan 4 01:17:34 UTC 2019
>
> HI
>
>
>
> Today I tried to play guest GPU p2p with the following way, but failed, does anyone know the reason?
>
>
>
> Hypervisor info
> [root localhost ~]#./qemu-system-x86_64 --version
>
> QEMU emulator version 2.12.1 (v2.12.1-dirty)
>
> Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
>
>
>
> [root localhost ~]# nvidia-smi topo -p2p r
>
> GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7
>
> GPU0 X OK OK OK OK OK OK OK
>
> GPU1 OK X OK OK OK OK OK OK
>
> GPU2 OK OK X OK OK OK OK OK
>
> GPU3 OK OK OK X OK OK OK OK
>
> GPU4 OK OK OK OK X OK OK OK
>
> GPU5 OK OK OK OK OK X OK OK
>
> GPU6 OK OK OK OK OK OK X OK
>
> GPU7 OK OK OK OK OK OK OK X
>
>
>
> Legend:
>
>
>
> X = Self
>
> OK = Status Ok
>
> CNS = Chipset not supported
>
> GNS = GPU not supported
>
> TNS = Topology not supported
>
> NS = Not supported
>
> U = Unknown
>
> [root localhost ~]#
>
>
>
> [root localhost ~]# ps -ef | grep qemu
>
> root 2608 1 7 03:32 ? 00:09:42 /usr/local/qemu-2.12.1/bin/qemu-system-x86_64 -enable-kvm -cpu host,kvm=off -chardev socket,id=hmqmondev,port=55901,host=127.0.0.1,nodelay,server,nowait -mon chardev=hmqmondev,id=hmqmon,mode=readline -rtc base=utc,clock=host,driftfix=none -daemonize -nodefaults -nodefconfig -no-kvm-pit-reinjection -global kvm-pit.lost_tick_policy=discard -machine pc,accel=kvm -k en-us -smp 32 -name BarzHsu-AI -m 131072 -boot order=cdn -device virtio-serial -usb -device usb-kbd -device usb-tablet -vga std -vnc :1 -device virtio-scsi-pci,id=scsi -drive file=/opt/cloud/workspace/disks/3691b8d4-04bd-4338-8134-67620d37bdc8,if=none,id=drive_0,cache=none,aio=native -device scsi-hd,drive=drive_0,bus=scsi.0,id=drive_0 -drive file=/opt/cloud/workspace/disks/24dc552b-8518-4334-92c8-f78c4db8f626,if=none,id=drive_1,cache=none,aio=native -device scsi-hd,drive=drive_1,bus=scsi.0,id=drive_1 -device vfio-pci,host=07:00.0,multifunction=on,addr=0x15,x-nv-gpudirect-clique=1 -device vfio-pci,host=07:00.1 -device vfio-pci,host=08:00.0,multifunction=on,addr=0x16,x-nv-gpudirect-clique=1 -device vfio-pci,host=08:00.1 -device vfio-pci,host=04:00.0,multifunction=on,addr=0x17,x-nv-gpudirect-clique=1 -device vfio-pci,host=04:00.1 -device vfio-pci,host=06:00.0,multifunction=on,addr=0x18,x-nv-gpudirect-clique=1 -device vfio-pci,host=06:00.1 -device vfio-pci,host=0f:00.0,multifunction=on,addr=0x19,x-nv-gpudirect-clique=1 -device vfio-pci,host=0f:00.1 -device vfio-pci,host=0e:00.0,multifunction=on,addr=0x1a,x-nv-gpudirect-clique=1 -device vfio-pci,host=0e:00.1 -device vfio-pci,host=0d:00.0,multifunction=on,addr=0x1b,x-nv-gpudirect-clique=1 -device vfio-pci,host=0d:00.1 -device vfio-pci,host=0c:00.0,multifunction=on,addr=0x1c,x-nv-gpudirect-clique=1 -device vfio-pci,host=0c:00.1 -device ide-cd,drive=ide0-cd0,bus=ide.1,unit=1 -drive id=ide0-cd0,media=cdrom,if=none -netdev type=tap,id=vnet22-254,ifname=vnet22-254,vhost=on,vhostforce=off,script=/opt/cloud/workspace/servers/6af6cf5b-5c97-426d-92a6-972c0c40c78a/if-up-b
r0-vnet22-254.sh,downscript=/opt/cloud/workspace/servers/6af6cf5b-5c97-426d-92a6-972c0c40c78a/if-down-br0-vnet22-254.sh -device virtio-net-pci,netdev=vnet22-254,mac=00:22:4c:50:fe:65,addr=0xf,speed=10000 -pidfile /opt/cloud/workspace/servers/6af6cf5b-5c97-426d-92a6-972c0c40c78a/pid -chardev socket,path=/opt/cloud/workspace/servers/6af6cf5b-5c97-426d-92a6-972c0c40c78a/qga.sock,server,nowait,id=qga0 -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0 -object rng-random,filename=/dev/random,id=rng0 -device virtio-rng-pci,rng=rng0,max-bytes=1024,period=1000
>
>
>
> Guest info
> guest BarzHsu-AI:~$ nvidia-smi topo -m
> GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7 CPU Affinity
> GPU0 X PHB PHB PHB PHB PHB PHB PHB 0-31
> GPU1 PHB X PHB PHB PHB PHB PHB PHB 0-31
> GPU2 PHB PHB X PHB PHB PHB PHB PHB 0-31
> GPU3 PHB PHB PHB X PHB PHB PHB PHB 0-31
> GPU4 PHB PHB PHB PHB X PHB PHB PHB 0-31
> GPU5 PHB PHB PHB PHB PHB X PHB PHB 0-31
> GPU6 PHB PHB PHB PHB PHB PHB X PHB 0-31
> GPU7 PHB PHB PHB PHB PHB PHB PHB X 0-31
>
> Legend:
>
> X = Self
> SYS = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
> NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
> PHB = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
> PXB = Connection traversing multiple PCIe switches (without traversing the PCIe Host Bridge)
> PIX = Connection traversing a single PCIe switch
> NV# = Connection traversing a bonded set of # NVLinks
>
> guest BarzHsu-AI:~$ nvidia-smi topo -p2p r
>
> GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7
> GPU0 X CNS CNS CNS CNS CNS CNS CNS
> GPU1 CNS X CNS CNS CNS CNS CNS CNS
> GPU2 CNS CNS X CNS CNS CNS CNS CNS
> GPU3 CNS CNS CNS X CNS CNS CNS CNS
> GPU4 CNS CNS CNS CNS X CNS CNS CNS
> GPU5 CNS CNS CNS CNS CNS X CNS CNS
> GPU6 CNS CNS CNS CNS CNS CNS X CNS
> GPU7 CNS CNS CNS CNS CNS CNS CNS X
>
> Legend:
>
> X = Self
> OK = Status Ok
> CNS = Chipset not supported
> GNS = GPU not supported
> TNS = Topology not supported
> NS = Not supported
> U = Unknown
>
>
> Regards,
>
>
>
> Zhi Yong Wu
Hi,
Had you, after all, fixed that?
It was not Skylake CPU, was it?
Random shot in the dark:
Are you sure you had SR-IOV=on, Intel VT-d=on (
https://docs.nvidia.com/grid/5.0/grid-vgpu-user-guide/index.html#using-gpu-pass-through
) and AccessCtrl=off (
https://devtalk.nvidia.com/default/topic/883054/cuda-programming-and-performance/multi-gpu-peer-to-peer-access-failing-on-tesla-k80-/post/4766413/#4766413
)?
Best regards,
Igor Varfolomeev
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