Example analysis of size differences of rom content between PR/master/compiled versions (size.txt diff analysis)

[tlaurion]

Size comparison.

Master's 4af780864fcca6364afc8ec038787541193326f4 vs this PR's 9b69f1b66a29ea90045eabe1d679994810beb17a

wget https://output.circle-artifacts.com/output/job/03a0d0db-3e56-48e3-93d5-a23fa112e7a0/artifacts/0/build/x86/x230-hotp-maximized/sizes.txt -O master.txt
wget https://output.circle-artifacts.com/output/job/97f89967-bb86-4a38-8d43-1f196e5be39d/artifacts/0/build/x86/x230-hotp-maximized/sizes.txt -O 1384.txt
diff -u master.txt 1384.txt
[...]
--- master.txt	2024-02-16 13:57:39.000000000 -0500
+++ 1384.txt	2024-02-21 14:18:12.000000000 -0500
@@ -1,6 +1,6 @@
-2024-02-16 13:46:15-05:00 95f9636a1adb26fc061228443ec6910ffe39c02b clean
- 2488800:/root/project/build/x86/x230-hotp-maximized/bzImage
-  685056:/root/project/build/x86/x230-hotp-maximized/modules.cpio
+2024-02-21 14:04:48-05:00 9b69f1b66a29ea90045eabe1d679994810beb17a clean
+ 2489216:/root/project/build/x86/x230-hotp-maximized/bzImage
+  813056:/root/project/build/x86/x230-hotp-maximized/modules.cpio
 -----
   304040:./lib/modules/e1000e.ko
    63272:./lib/modules/ehci-hcd.ko
@@ -8,6 +8,11 @@
   165024:./lib/modules/xhci-hcd.ko
    11544:./lib/modules/xhci-pci.ko
   128632:./lib/modules/usb-storage.ko
+   12776:./lib/modules/mii.ko
+   48808:./lib/modules/usbnet.ko
+   19024:./lib/modules/cdc_ether.ko
+   38016:./lib/modules/cdc_ncm.ko
+    9048:./lib/modules/cdc_eem.ko
 -----
 12572160:/root/project/build/x86/x230-hotp-maximized/tools.cpio
 -----
@@ -71,7 +76,7 @@
    35432:./bin/cbmem
      741:./etc/config
 -----
-  389120:/root/project/build/x86/x230-hotp-maximized/heads.cpio
+  391680:/root/project/build/x86/x230-hotp-maximized/heads.cpio
 -----
     1585:./.ash_history
       73:./.gnupg/gpg-agent.conf
@@ -104,7 +109,7 @@
     2132:./bin/lock_chip
     2836:./bin/media-scan
     6013:./bin/mount-usb
-    1609:./bin/network-init-recovery
+    4204:./bin/network-init-recovery
      745:./bin/nitropad-shutdown.sh
    53851:./bin/oem-factory-reset
     2316:./bin/oem-system-info-xx30
@@ -152,5 +157,5 @@
      924:./sbin/config-dhcp.sh
     1271:./sbin/insmod
 -----
- 4666368:build/x86/x230-hotp-maximized/initrd.cpio.xz
- 8388608:/root/project/build/x86/x230-hotp-maximized/heads-x230-hotp-maximized-v0.2.0-2024-g95f9636-bottom.rom
+ 4691968:build/x86/x230-hotp-maximized/initrd.cpio.xz
+ 8388608:/root/project/build/x86/x230-hotp-maximized/heads-x230-hotp-maximized-v0.2.0-2026-g9b69f1b-bottom.rom

Analysis:

- 4666368:build/x86/x230-hotp-maximized/initrd.cpio.xz
+ 4691968:build/x86/x230-hotp-maximized/initrd.cpio.xz
- 2488800:/root/project/build/x86/x230-hotp-maximized/bzImage
+ 2489216:/root/project/build/x86/x230-hotp-maximized/bzImage

Additional ROM consumed compressed space: (4691968-4666368)+(2489216-2488800)= 26016 bytes (~25Kb)

Originally posted by @tlaurion in https://github.com/linuxboot/heads/issues/1384#issuecomment-1826828059