diff --git a/lib/app_generator/search_app.rb b/lib/app_generator/search_app.rb
index 553db1bbf..e7936c184 100644
--- a/lib/app_generator/search_app.rb
+++ b/lib/app_generator/search_app.rb
@@ -26,6 +26,7 @@ class SearchApp < App
                   :cpu_socket_affinity => :cpu_socket_affinity,
                   :resource_limits => :resource_limits,
                   :posting_list_cache => :posting_list_cache,
+                  :bitvector_cache => :bitvector_cache,
                   :proton_resource_limits => :proton_resource_limits,
                   :search_io => :search_io,
                   :indexing_cluster => :indexing_cluster,
diff --git a/lib/app_generator/search_cluster.rb b/lib/app_generator/search_cluster.rb
index 62afee9a7..ffdaa7511 100644
--- a/lib/app_generator/search_cluster.rb
+++ b/lib/app_generator/search_cluster.rb
@@ -30,6 +30,7 @@ class SearchCluster
   chained_setter :persistence_threads
   chained_setter :resource_limits
   chained_setter :posting_list_cache
+  chained_setter :bitvector_cache
   chained_setter :proton_resource_limits
   chained_setter :search_io
   chained_forward :config, :config => :add
@@ -71,6 +72,7 @@ def initialize(name = "search")
     @persistence_threads = nil
     @resource_limits = nil
     @posting_list_cache = nil
+    @bitvector_cache = nil
     @proton_resource_limits = nil
     @search_io = nil
   end
@@ -157,8 +159,15 @@ def proton_config(indent)
     unless @search_io.nil?
       proton.add('search', ConfigValue.new('io', @search_io))
     end
-    unless @posting_list_cache.nil?
-      proton.add('index', ConfigValue.new('postinglist', ConfigValue.new('cache', ConfigValue.new('maxbytes', @posting_list_cache))))
+    unless @posting_list_cache.nil? && @bitvector_cache.nil?
+      cache = ConfigValues.new
+      unless @posting_list_cache.nil?
+         cache.add('postinglist', ConfigValue.new('maxbytes', @posting_list_cache))
+      end
+      unless @bitvector_cache.nil?
+        cache.add('bitvector', ConfigValue.new('maxbytes', @bitvector_cache))
+      end
+      proton.add('index', ConfigValue.new('cache', cache))
     end
     XmlHelper.new(indent).to_xml(proton)
   end
diff --git a/lib/app_generator/test/test.rb b/lib/app_generator/test/test.rb
index c852cbeb9..660e29b64 100644
--- a/lib/app_generator/test/test.rb
+++ b/lib/app_generator/test/test.rb
@@ -734,11 +734,44 @@ def test_that_posting_list_cache_can_be_specified
 
     expected_config_fragment='
       <index>
-        <postinglist>
-          <cache>
+        <cache>
+          <postinglist>
             <maxbytes>12345</maxbytes>
-          </cache>
-        </postinglist>
+          </postinglist>
+        </cache>
+      </index>'
+
+    assert_substring_ignore_whitespace(actual, expected_config_fragment)
+  end
+
+  def test_that_bitvector_list_cache_can_be_specified
+    actual = SearchApp.new.bitvector_cache(12346).services_xml
+
+    expected_config_fragment='
+      <index>
+        <cache>
+          <bitvector>
+            <maxbytes>12346</maxbytes>
+          </bitvector>
+        </cache>
+      </index>'
+
+    assert_substring_ignore_whitespace(actual, expected_config_fragment)
+  end
+
+    def test_that_both_posting_list_cache_and_bitvector_cache_can_be_specified
+    actual = SearchApp.new.bitvector_cache(12346).posting_list_cache(12345).services_xml
+
+    expected_config_fragment='
+      <index>
+        <cache>
+          <postinglist>
+            <maxbytes>12345</maxbytes>
+          </postinglist>
+          <bitvector>
+            <maxbytes>12346</maxbytes>
+          </bitvector>
+        </cache>
       </index>'
 
     assert_substring_ignore_whitespace(actual, expected_config_fragment)
diff --git a/tests/performance/mmap_vs_directio/mmap_vs_directio.rb b/tests/performance/mmap_vs_directio/mmap_vs_directio.rb
index d53cb5bd3..c1de850c2 100644
--- a/tests/performance/mmap_vs_directio/mmap_vs_directio.rb
+++ b/tests/performance/mmap_vs_directio/mmap_vs_directio.rb
@@ -132,8 +132,8 @@ def make_app(search_io_mode:, cache_size_mb: 0)
 
     if search_io_mode != 'MMAP'
       app.config(ConfigOverride.new('vespa.config.search.core.proton').
-        add('index', ConfigValue.new('postinglist',
-          ConfigValue.new('cache', ConfigValue.new('maxbytes', cache_size_mb * 1024 * 1024)))))
+        add('index', ConfigValue.new('cache',
+          ConfigValue.new('postinglist', ConfigValue.new('maxbytes', cache_size_mb * 1024 * 1024)))))
     end
     app
   end