On Wed, Apr 11, 2018 at 3:29 AM, Waldek Kozaczuk <jwkozac...@gmail.com>

> Last week I have been trying to hack OSv to run on hyperkit and finally I
> managed to execute native hello world example with ROFS.
> Here is a timing on hyperkit/OSX (the bootchart does not work on hyperkit
> due to not granular enough timer):
> OSv v0.24-516-gc872202
> Hello from C code
> *real 0m0.075s *
> *user 0m0.012s *
> *sys 0m0.058s*
> command to boot it (please note that I hacked the lzloader ELF to support
> multiboot):
> hyperkit -A -m 512M \
>   -s 0:0,hostbridge \
>   -s 31,lpc \
>   -l com1,stdio \
>   -s 4,virtio-blk,test.img \
>   -f multiboot,lzloader.elf

Impressive! How hard is it to setup hyperkit on osx, just brew install?

> Here is a timing on QEMU/KVM on Linux (same hardware - my laptop is setup
> to triple-boot Ubuntu 16/Mac OSX and Windows):
> OSv v0.24-510-g451dc6d
> 4 CPUs detected
> Firmware vendor: SeaBIOS
> bsd: initializing - done
> VFS: mounting ramfs at /
> VFS: mounting devfs at /dev
> net: initializing - done
> vga: Add VGA device instance
> virtio-blk: Add blk device instances 0 as vblk0, devsize=8520192
> random: intel drng, rdrand registered as a source.
> random: <Software, Yarrow> initialized
> VFS: unmounting /dev
> VFS: mounting rofs at /rofs
> VFS: mounting devfs at /dev
> VFS: mounting procfs at /proc
> VFS: mounting ramfs at /tmp
> disk read (real mode): 28.31ms, (+28.31ms)
> uncompress lzloader.elf: 49.63ms, (+21.32ms)
> TLS initialization: 50.23ms, (+0.59ms)
> .init functions: 52.22ms, (+1.99ms)
> SMP launched: 53.01ms, (+0.79ms)
> VFS initialized: 55.25ms, (+2.24ms)
> Network initialized: 55.54ms, (+0.29ms)
> pvpanic done: 55.66ms, (+0.12ms)
> pci enumerated: 60.40ms, (+4.74ms)
> drivers probe: 60.40ms, (+0.00ms)
> drivers loaded: 126.37ms, (+65.97ms)
> ROFS mounted: 128.65ms, (+2.28ms)
> Total time: 128.65ms, (+0.00ms)
> Hello from C code
> VFS: unmounting /dev
> VFS: unmounting /proc
> VFS: unmounting /
> ROFS: spent 1.00 ms reading from disk
> ROFS: read 21 512-byte blocks from disk
> ROFS: allocated 18 512-byte blocks of cache memory
> ROFS: hit ratio is 89.47%
> Powering off.
> *real 0m1.049s*
> *user 0m0.173s*
> *sys 0m0.253s*
> booted like so:
> qemu-system-x86_64 -m 2G -smp 4 \
>  -device virtio-blk-pci,id=blk0,bootindex=0,drive=hd0,scsi=off \
>  -drive 
> file=/home/wkozaczuk/projects/osv/build/last/usr.img,if=none,id=hd0,cache=none,aio=native
>  \
>  -enable-kvm -cpu host,+x2apic \
>  -chardev stdio,mux=on,id=stdio,signal=off \
>  -mon chardev=stdio,mode=readline
>  -device isa-serial,chardev=stdio
> In both cases I am not using networking - only block device. BTW I have
> not tested how networking nor SMP on hyperkit with OSv.
> So as you can see* OSv is 10 (ten) times faster* on the same hardware. I
> am not sure if my results are representative. But if they are it would mean
> that QEMU is probably the culprit. Please see my questions/consideration
> toward the end of the email.
> Anyway let me give you some background. What is hyperkit? Hyperkit (
> https://github.com/moby/hyperkit) is a fork by Docker of xhyve (
> https://github.com/mist64/xhyve) which itself is a port of bhyve (
> https://www.freebsd.org/doc/handbook/virtualization-host-bhyve.html) -
> hypervisor on FreeBSD. Bhyve architecture is similar to that of KVM/QEMU
> but QEMU-equivalent of bhyve is much lighter and simpler:
> "The bhyve BSD-licensed hypervisor became part of the base system with
> FreeBSD 10.0-RELEASE. This hypervisor supports a number of guests,
> including FreeBSD, OpenBSD, and many Linux® distributions. By default,
> bhyve provides access to serial console and does not emulate a graphical
> console. Virtualization offload features of newer CPUs are used to avoid
> the legacy methods of translating instructions and manually managing memory
> mappings.
> The bhyve design requires a processor that supports Intel® Extended Page
> Tables (EPT) or AMD® Rapid Virtualization Indexing (RVI) or Nested Page
> Tables (NPT). Hosting Linux® guests or FreeBSD guests with more than one
> vCPU requires VMX unrestricted mode support (UG). Most newer processors,
> specifically the Intel® Core™ i3/i5/i7 and Intel® Xeon™ E3/E5/E7, support
> these features. UG support was introduced with Intel's Westmere
> micro-architecture. For a complete list of Intel® processors that support
> EPT, refer to http://ark.intel.com/search/advanced?s=t&;
> ExtendedPageTables=true. RVI is found on the third generation and later
> of the AMD Opteron™ (Barcelona) processors"
> Hyperkit/Xhyve is a port of bhyve but targets Apple OSX as a host system
> and instead of FreeBSD vmm kernel module uses Apple hypervisor framework (
> https://developer.apple.com/documentation/hypervisor). Docker, I think,
> forked xhyve to create hyperkit in order to provide lighter alternative of
> running Docker containers on Linux on Mac. So in essence hyperkit is a
> component of Docker for Mac vs Docker Machine/Toolbox (based on
> VirtualBox). Please see for details there - https://docs.docker.com/
> docker-for-mac/docker-toolbox/.
> How does it apply to OSv? It only applies if you want to run OSv on Mac.
> Now the only choice is QEMU (dog slow because no KVM) or VirtualBox (pretty
> fast once OSv is up but it takes long time to boot and has other
> configuration quirks). Based on my experiments hyperkit becomes very
> compelling new alternative.
> Reletely you maybe aware of uKVM (https://github.com/Solo5/solo5) - very
> light hypervisor to run clean-state unikernels like MirageOS or IncludeOS.
> There is an OSv issue - https://github.com/cloudius-
> systems/osv/issues/886- and corresponding one on uKVM -
> https://github.com/Solo5/solo5/issues/249 - to track what it would take
> to boot OSv on it. It turns our (read issues for details) that in current
> form uKVM is too minimalistic for OSv. For example there is no interrupts.
> The experiment with hyperkit made me think that it would be nice if there
> an alternative to QEMU on Linux - simpler and lighter than qemu but not as
> minimalistic as uKVM - something equivalent to bhyve for Linux.
> Waldek
> PS. I have created an issue https://github.com/
> cloudius-systems/osv/issues/948 to track what it would take to make OSv
> run on hyperkit.
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