diff --git a/crates/ctl/src/cli/cpu_topology.rs b/crates/ctl/src/cli/cpu_topology.rs
index 3bc61fb..12b77fd 100644
--- a/crates/ctl/src/cli/cpu_topology.rs
+++ b/crates/ctl/src/cli/cpu_topology.rs
@@ -29,8 +29,7 @@ impl CpuTopologyCommand {
             .await?
             .into_inner();
 
-        let mut i = 0;
-        for cpu in response.cpus {
+        for (i, cpu) in response.cpus.iter().enumerate() {
             println!(
                 "{0:<10} {1:<10} {2:<10} {3:<10} {4:<10} {5:<10}",
                 i,
@@ -40,7 +39,6 @@ impl CpuTopologyCommand {
                 cpu.thread,
                 class_to_str(cpu.class)
             );
-            i += 1;
         }
 
         Ok(())
diff --git a/crates/daemon/bin/daemon.rs b/crates/daemon/bin/daemon.rs
index c9b9ebd..6c2cb26 100644
--- a/crates/daemon/bin/daemon.rs
+++ b/crates/daemon/bin/daemon.rs
@@ -20,20 +20,10 @@ async fn main() -> Result<()> {
         .filter(Some("backhand::filesystem::writer"), LevelFilter::Warn);
 
     if let Ok(f_addr) = std::env::var("KRATA_FLUENT_ADDR") {
-        println!("KRATA_FLUENT_ADDR set to {f_addr}");
         let target = SocketAddr::from_str(f_addr.as_str())?;
         builder.target(Target::Pipe(Box::new(TcpStream::connect(target)?)));
     }
 
-    let ev = std::env::vars()
-        .into_iter()
-        .fold(String::new(), |mut acc, (k, v)| {
-            acc.push_str(&format!("{k}={v}\n"));
-            acc
-        });
-
-    std::fs::write("/var/log/krata/ev", ev)?;
-
     builder.init();
 
     mask_sighup()?;
diff --git a/crates/loopdev/src/lib.rs b/crates/loopdev/src/lib.rs
index c642b07..77b7486 100644
--- a/crates/loopdev/src/lib.rs
+++ b/crates/loopdev/src/lib.rs
@@ -223,7 +223,6 @@ impl LoopDevice {
         self.device
             .metadata()
             .map(|m| unsafe { libc::major(m.rdev()) })
-            .map(|m| m as u32)
     }
 
     /// Return the minor device node number.
@@ -231,7 +230,6 @@ impl LoopDevice {
         self.device
             .metadata()
             .map(|m| unsafe { libc::minor(m.rdev()) })
-            .map(|m| m as u32)
     }
 }
 
@@ -327,11 +325,7 @@ impl AttachOptions<'_> {
     }
 
     pub fn direct_io(&self) -> bool {
-        if (self.info.lo_flags & LO_FLAGS_DIRECT_IO) == LO_FLAGS_DIRECT_IO {
-            true
-        } else {
-            false
-        }
+        (self.info.lo_flags & LO_FLAGS_DIRECT_IO) == LO_FLAGS_DIRECT_IO
     }
 
     pub fn attach(&self, backing_file: impl AsRef<Path>) -> io::Result<()> {
diff --git a/crates/runtime/src/power.rs b/crates/runtime/src/power.rs
index 3f92375..fa3299c 100644
--- a/crates/runtime/src/power.rs
+++ b/crates/runtime/src/power.rs
@@ -42,6 +42,7 @@ fn labelled_topo(input: &[SysctlCputopo]) -> Vec<CpuTopologyInfo> {
                     class: CpuClass::Standard,
                 }],
             );
+            last = Some(*item);
             continue;
         }
 
@@ -73,6 +74,13 @@ fn labelled_topo(input: &[SysctlCputopo]) -> Vec<CpuTopologyInfo> {
             pe_cores = true;
         } else if pe_cores && last.map(|last| item.core == last.core + 1).unwrap_or(false) {
             // detect efficiency cores if P/E cores are in use.
+            if let Some(last) = last {
+                if let Some(list) = cores.get_mut(&(last.core, last.socket, last.node)) {
+                    for other in list {
+                        other.class = CpuClass::Efficiency;
+                    }
+                }
+            }
             let list = cores
                 .entry((item.core, item.socket, item.node))
                 .or_default();
@@ -108,7 +116,7 @@ fn labelled_topo(input: &[SysctlCputopo]) -> Vec<CpuTopologyInfo> {
                 });
             }
         }
-        last = Some(item.clone());
+        last = Some(*item);
     }
 
     for threads in cores.values_mut() {
@@ -117,11 +125,7 @@ fn labelled_topo(input: &[SysctlCputopo]) -> Vec<CpuTopologyInfo> {
         }
     }
 
-    cores
-        .into_values()
-        .into_iter()
-        .flatten()
-        .collect::<Vec<_>>()
+    cores.into_values().flatten().collect::<Vec<_>>()
 }
 
 impl PowerManagementContext {
diff --git a/crates/xen/xencall/examples/cputopo.rs b/crates/xen/xencall/examples/cputopo.rs
new file mode 100644
index 0000000..716ac77
--- /dev/null
+++ b/crates/xen/xencall/examples/cputopo.rs
@@ -0,0 +1,19 @@
+use xencall::error::Result;
+use xencall::sys::CpuId;
+use xencall::XenCall;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    env_logger::init();
+
+    let call = XenCall::open(0)?;
+    let physinfo = call.phys_info().await?;
+    println!("{:?}", physinfo);
+    let topology = call.cpu_topology().await?;
+    println!("{:?}", topology);
+    call.set_cpufreq_gov(CpuId::All, "performance").await?;
+    call.set_cpufreq_gov(CpuId::Single(0), "performance")
+        .await?;
+    call.set_turbo_mode(CpuId::All, true).await?;
+    Ok(())
+}