diff --git a/.github/workflows/cargo-llvm-cov.yml b/.github/workflows/cargo-llvm-cov.yml
index d0320ecf1b45e..a0612df8fd1cf 100644
--- a/.github/workflows/cargo-llvm-cov.yml
+++ b/.github/workflows/cargo-llvm-cov.yml
@@ -2,6 +2,30 @@ name: Code Coverage
 on:
   workflow_dispatch:
 
+env:
+  CARGO_TERM_COLOR: always
+  # Disable incremental compilation.
+  #
+  # Incremental compilation is useful as part of an edit-build-test-edit cycle,
+  # as it lets the compiler avoid recompiling code that hasn't changed. However,
+  # on CI, we're not making small edits; we're almost always building the entire
+  # project from scratch. Thus, incremental compilation on CI actually
+  # introduces *additional* overhead to support making future builds
+  # faster...but no future builds will ever occur in any given CI environment.
+  #
+  # See https://matklad.github.io/2021/09/04/fast-rust-builds.html#ci-workflow
+  # for details.
+  CARGO_INCREMENTAL: 0
+  # Allow more retries for network requests in cargo (downloading crates) and
+  # rustup (installing toolchains). This should help to reduce flaky CI failures
+  # from transient network timeouts or other issues.
+  CARGO_NET_RETRY: 10
+  RUSTUP_MAX_RETRIES: 10
+  # Don't emit giant backtraces in the CI logs.
+  RUST_BACKTRACE: short
+  # RUSTFLAGS: -D warnings
+  RUSTDOCFLAGS: -D warnings
+
 jobs:
   cargo-llvm-cov:
     name: Generate code coverage
diff --git a/scripts/simtest/cargo-simtest b/scripts/simtest/cargo-simtest
index ef1dcaaa3eaff..1e117b7800fe6 100755
--- a/scripts/simtest/cargo-simtest
+++ b/scripts/simtest/cargo-simtest
@@ -100,7 +100,7 @@ if [ "$1" = "build" ]; then
 fi
 
 if [ $CODE_COV == 1 ]; then
-  CARGO_COMMAND=(llvm-cov --ignore-run-fail --all-features --workspace --lcov --output-path lcov.info nextest --cargo-profile simulator)
+  CARGO_COMMAND=(llvm-cov --ignore-run-fail --lcov --output-path lcov.info nextest --cargo-profile simulator)
 fi
 
 # Must supply a new temp dir - the test is deterministic and can't choose one randomly itself.