tmp: enable huge pages by default

To do some performance testing comparing huge pages with small pages.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

src/vmm/src/vmm_config/machine_config.rs

@@ -53,11 +53,11 @@ impl From<kernel_version::Error> for VmConfigError {
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum HugePageConfig {
     /// Do not use hugepages, e.g. back guest memory by 4K
-    #[default]
     #[serde(alias = "4K")]
     None,
     /// Back guest memory by 2MB hugetlbfs pages
     #[serde(rename = "2M")]
+    #[default]
     Hugetlbfs2M,
     /// Back guest memory by 1GB hugetlbfs
     #[serde(rename = "1G")]

tools/devtool

@@ -697,7 +697,7 @@ cmd_test() {
       # anyway (something else on the host seems to be stealing our huge pages, and we cannot "ear mark" them for
       # Firecracker processes). Thus, just allocate 4GB of them and call it a day.
       say "Setting up huge pages pool"
-      num_hugetlbfs_pages=2048
+      num_hugetlbfs_pages=51200 # 100GiB huge pages pool
 
       # Allocate enough 2M hugetlbfs pages to boot a single 128MB microvm
       huge_pages_old=$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages)