From e5455293e338907c4a3cf9a461a7544083d7c762 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@xry111.site>
Date: Mon, 28 Aug 2023 16:57:45 +0800
Subject: [PATCH] tar: Mention TESTSUITEFLAGS for testing

---
 chapter08/tar.xml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/chapter08/tar.xml b/chapter08/tar.xml
index bfb1cf469..e55ad664d 100644
--- a/chapter08/tar.xml
+++ b/chapter08/tar.xml
@@ -72,6 +72,13 @@
 
 <screen><userinput remap="test">make check</userinput></screen>
 
+    <!-- On one system the -j4 improvement is 167s - 46s = 121s (72.46%) -->
+    <note><para>The test time for Tar can be reduced significantly on a
+    system with multiple cores.  To do this, append
+    <command>TESTSUITEFLAGS=-j&lt;N&gt;</command> to the line above.  For
+    instance, using -j4 can reduce the test time by over 70
+    percent.</para></note>
+
     <para>One test, capabilities: binary store/restore, is known to fail if it is
     run because LFS lacks selinux, but will be skipped if the host kernel does
     not support extended attributes on the filesystem used for building LFS.</para>