--- wikisrc/kernel_debugging_with_qemu.mdwn	2015/08/05 12:58:13	1.12
+++ wikisrc/kernel_debugging_with_qemu.mdwn	2021/12/27 14:26:28	1.19
@@ -16,11 +16,11 @@ If your host system is running NetBSD, i
 from pkgsrc:
 
 * emulators/qemu >= 2.0.0nb4
-* misc/py-anita
+* misc/py-anita >= 1.44
 
 If your host system uses a package system other than pkgsrc,
 use that to install cvs, make, gcc, qemu, the Python pexpect
-library, and genisoimage or mkisofs.  Also download and 
+library, and genisoimage or mkisofs.  Also download and
 install the most recent anita package from
 <http://www.gson.org/netbsd/anita/download/>.
 
@@ -28,11 +28,13 @@ install the most recent anita package fr
 
 Check out the NetBSD-current sources from CVS and build a full release
 of NetBSD-current/i386 with debug symbols using the build.sh script.
-The i386 port is the preferred test platform because the two
-other ports supported by anita are affected by known bugs: amd64 by
-[[PR 50128|http://gnats.NetBSD.org/50128]], and sparc by
-[[qemu bug 1399943|https://bugs.launchpad.net/qemu/+bug/1399943]].
-If you do the build in a directory other than /usr/src, 
+The i386 port is preferred because these instructions have been
+successfully tested with it.
+The amd64 port won't work because of [[PR 50128|http://gnats.NetBSD.org/50128]],
+and sparc has not been tested since [[qemu bug
+1399943|https://bugs.launchpad.net/qemu/+bug/1399943]] was fixed.
+
+If you do the build in a directory other than /usr/src,
 use the -fdebug-prefix-map option to ensure that the source file names embedded
 in the debug symbols point to /usr/src, which is where the sources will be
 installed on the target system.  For example:
@@ -40,7 +42,7 @@ installed on the target system.  For exa
 [[!template  id=programlisting text="""
  $ CVSROOT=anoncvs@anoncvs.NetBSD.org:/cvsroot cvs checkout -A -P src
  $ cd src
- $ ./build.sh -j 4 -V MKDEBUG=YES -V COPTS="-g -fdebug-prefix-map=$(pwd)=/usr/src" -O ../obj -m i386 -U release sourcesets
+ $ ./build.sh -j 4 -V MKDEBUG=yes -V COPTS="-g -fdebug-prefix-map=$(pwd)=/usr/src" -O ../obj -m i386 -U release sourcesets
 """]]
 
 For best performance, change the number after "-j" to the number of CPU cores
@@ -52,7 +54,7 @@ Install the system in a virtual machine,
 
 [[!template  id=programlisting text="""
  $ cd ..
- $ anita --workdir work --disk-size 4G --memory-size 256M \
+ $ anita --workdir work --disk-size 8G --memory-size 256M \
      --sets kern-GENERIC,modules,base,etc,comp,debug,games,man,misc,tests,text,syssrc,src,sharesrc,gnusrc \
      install $(pwd)/obj/releasedir/i386/
 """]]
@@ -72,7 +74,7 @@ First start the target VM, enabling qemu
 on TCP port 1234:
 
 [[!template  id=programlisting text="""
- $ qemu-system-i386 -nographic -snapshot -hda work/wd0.img -gdb tcp::1234
+ $ qemu-system-i386 -nographic -snapshot -hda work/wd0.img -m 128 -gdb tcp::1234
 """]]
 
 If you don't want everyone on the Internet to be able to debug your
@@ -82,7 +84,7 @@ your firewall.
 In a second terminal window, start the gdb VM:
 
 [[!template  id=programlisting text="""
- $ qemu-system-i386 -nographic -snapshot -hda work/wd0.img
+ $ qemu-system-i386 -nographic -snapshot -hda work/wd0.img -m 256
 """]]
 
 Log in to the gdb VM as root and set up the network:
@@ -111,10 +113,8 @@ with full debug symbols and access to th
 """]]
 
 If the stack trace prints very slowly (like 30 seconds per stack
-frame), it's likely because you are using a version of qemu where
-the user-mode networking code fails to disable the Nagle algorithm.
-This is fixed in the qemu in pkgsrc, but you may run into it if your
-qemu is not installed via pkgsrc.
+frame), you are probably using an old version of qemu that fails
+to disable the Nagle algorithm.
 
 ## Qemu tips