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Cloud Hypervisor Performance Metrics

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Dom edited this page Feb 27, 2023 · 7 revisions 
$ ./scripts/dev_cli.sh tests --metrics
Compiling hypervisor v0.1.0 (/cloud-hypervisor/hypervisor)
error[E0433]: failed to resolve: use of undeclared crate or module `mshv`
  --> hypervisor/src/lib.rs:77:8
   |
77 |     if mshv::MshvHypervisor::is_available()? {
   |        ^^^^ use of undeclared crate or module `mshv`

error[E0433]: failed to resolve: use of undeclared crate or module `mshv`
  --> hypervisor/src/lib.rs:78:16
   |
78 |         return mshv::MshvHypervisor::new();
   |                ^^^^ use of undeclared crate or module `mshv`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `hypervisor` due to 2 previous errors
warning: build failed, waiting for other jobs to finish...

It looks cloud hypervisor does not support mshv for arm64 (https://github.com/cloud-hypervisor/cloud-hypervisor/blob/main/release-notes.md#release-binary-supports-both-mshv-and-kvm).

Release Binary Supports Both MSHV and KVM
On x86-64 the binary included in releases supports both the KVM and MSHV hypervisor with runtime detection to identify the correct hypervisor to use.

So change scripts/run_metrics.sh to disable mshv in cloud hypervisor:

diff --git a/scripts/run_metrics.sh b/scripts/run_metrics.sh
index ea4aa990..ed7b4b39 100755
--- a/scripts/run_metrics.sh
+++ b/scripts/run_metrics.sh
@@ -92,7 +92,8 @@ if [[ "${BUILD_TARGET}" == "${TEST_ARCH}-unknown-linux-musl" ]]; then
     CFLAGS="-I /usr/include/${TEST_ARCH}-linux-musl/ -idirafter /usr/include/"
 fi

-cargo build --no-default-features --features "kvm,mshv" --all --release --target $BUILD_TARGET
+#cargo build --no-default-features --features "kvm,mshv" --all --release --target $BUILD_TARGET
+cargo build --no-default-features --features "kvm" --all --release --target $BUILD_TARGET

 # setup hugepages
 echo 6144 | sudo tee /proc/sys/vm/nr_hugepages

We can get metrics:

{
  "git_human_readable": "v28.0-231-g3df82337-dirty",
  "git_revision": "3df82337f1f3bc81f04d787fdd98c8c612b1099f",
  "git_commit_date": "Fri Jan 13 01:34:59 2023 +0000",
  "date": "Wed Jan 18 13:33:04 UTC 2023",
  "results": [
    {
      "name": "boot_time_ms",
      "mean": 295.95369999999997,
      "std_dev": 10.243182533275483,
      "max": 316.84599999999995,
      "min": 285.472
    },

... ...

It is interesting to note, linux kernel supports booting linux guest on MS hyper-v on ARM64 HW: https://lore.kernel.org/all/1628092359-61351-1-git-send-email-mikelley@microsoft.com/ . How to test MSHV on arm64?

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