Android ListView Map Behavior

I just noticed. When I use a layout inside my ListView I usually use a LinearLayout and then a CardView inside it. CardView has 10dp headroom and everything looks great. However, when I just use a CardView that has the same attributes, it doesn't make a difference for me. Is there something I am doing wrong?

Layout 1 (Gives me the layout I want):

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        card_view:cardBackgroundColor="@color/white"
        card_view:cardElevation="2sp"
        card_view:cardUseCompatPadding="true">

    </android.support.v7.widget.CardView>

</LinearLayout>

      

        
        
        
      

    

Layout 2 (without any margin):

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    card_view:cardElevation="2sp"
    card_view:cardUseCompatPadding="true"
    card_view:cardBackgroundColor="@color/white">

</android.support.v7.widget.CardView>