@bennyisaiah (benny ) posted a new topic, subject "Delta rpms: wasted?". It read:

   Hi there,
    
    I am just wondering if I need to be concerned about this message, is this clearing out old dependency files or something that doesn't seem to matter.
    
    **Total 7.2 MB/s | 313 MB 00:43  
    Failed Delta RPMs increased 276.8 MB of updates to 312.6 MB (11.5% wasted)**
    [code] 
        Transaction Summary
        ================================================================================
        Install   4 Packages
        Upgrade  31 Packages
        Remove    4 Packages
        
        Total download size: 277 M
        Is this ok [Y/n]: 
        Downloading Packages:
        (1/35): criu-libs-3.17-1.fc36_3.17-2.fc36.x86_6  48 kB/s | 8.9 kB     00:00    
        (2/35): perl-libwww-perl-6.65-1.fc36_6.66-1.fc3 356 kB/s |  78 kB     00:00    
        (3/35): gnome-keyring-pam-42.1-1.fc36.x86_64.rp 281 kB/s |  20 kB     00:00    
        (4/35): kernel-headers-5.17.6-300.fc36_5.17.11- 506 kB/s | 135 kB     00:00    
        (5/35): kernel-5.17.11-300.fc36.x86_64.rpm      598 kB/s | 164 kB     00:00    
        (6/35): hicolor-icon-theme-0.17-13.fc36.noarch. 689 kB/s |  66 kB     00:00    
        (7/35): libbytesize-2.7-1.fc36.x86_64.rpm       388 kB/s |  40 kB     00:00    
        (8/35): libxmlb-0.3.9-1.fc36.x86_64.rpm         668 kB/s | 117 kB     00:00    
        (9/35): logrotate-3.20.1-1.fc36.x86_64.rpm      338 kB/s |  76 kB     00:00    
        (10/35): perl-XML-LibXSLT-2.002.000-1.fc36.x86_ 416 kB/s |  65 kB     00:00    
        (11/35): python3-bytesize-2.7-1.fc36.x86_64.rpm 112 kB/s |  21 kB     00:00    
        (12/35): selinux-policy-36.9-1.fc36.noarch.rpm  447 kB/s |  73 kB     00:00    
        (13/35): criu-3.17-2.fc36.x86_64.rpm            593 kB/s | 546 kB     00:00    
        (14/35): system-config-printer-udev-1.5.16-1.fc 121 kB/s |  28 kB     00:00    
        (15/35): btrfs-progs-5.18-1.fc36.x86_64.rpm     668 kB/s | 957 kB     00:01    
        (16/35): librados2-16.2.9-1.fc36.x86_64.rpm     2.0 MB/s | 3.6 MB     00:01    
        (17/35): systemd-container-250.6-1.fc36.x86_64. 611 kB/s | 541 kB     00:00    
        (18/35): system-config-printer-libs-1.5.16-1.fc 704 kB/s | 1.1 MB     00:01    
        (19/35): kernel-modules-extra-5.17.9-300.fc36_5 955 kB/s | 2.2 MB     00:02    
        [DRPM 1/5] criu-libs-3.17-1.fc36_3.17-2.fc36.x86_64.drpm: done                 
        [DRPM 2/5] perl-libwww-perl-6.65-1.fc36_6.66-1.fc36.noarch.drpm: done          
        (20/35): systemd-libs-250.6-1.fc36.x86_64.rpm   1.0 MB/s | 614 kB     00:00    
        (21/35): gnome-keyring-42.1-1.fc36.x86_64.rpm   324 kB/s | 877 kB     00:02    
        (22/35): systemd-oomd-defaults-250.6-1.fc36.noa  74 kB/s |  26 kB     00:00    
        (23/35): librbd1-16.2.9-1.fc36.x86_64.rpm       1.5 MB/s | 3.9 MB     00:02    
        (24/35): systemd-pam-250.6-1.fc36.x86_64.rpm    491 kB/s | 334 kB     00:00    
        (25/35): systemd-networkd-250.6-1.fc36.x86_64.r 575 kB/s | 566 kB     00:00    
        /var/cache/dnf/updates-a50f2ed408319fa8/packages/kernel-modules-extra-5.17.9-300.fc36_5.17.11-300.fc36.x86_64.drpm: md5 mismatch of result
        (26/35): systemd-resolved-250.6-1.fc36.x86_64.r 372 kB/s | 275 kB     00:00    
        (27/35): xorg-x11-server-Xwayland-22.1.2-1.fc36 671 kB/s | 975 kB     00:01    
        (28/35): systemd-250.6-1.fc36.x86_64.rpm        1.0 MB/s | 4.3 MB     00:04    
        (29/35): systemd-udev-250.6-1.fc36.x86_64.rpm   636 kB/s | 1.9 MB     00:03    
        (30/35): selinux-policy-targeted-36.9-1.fc36.no 1.0 MB/s | 6.4 MB     00:06    
        (31/35): vlc-30.255.87.135-1.fc36.x86_64.rpm         234 kB/s | 1.5 MB     00:06    
        (32/35): kernel-modules-5.17.9-300.fc36_5.17.11 3.3 MB/s |  35 MB     00:10    
        [DRPM 3/5] kernel-headers-5.17.6-300.fc36_5.17.11-300.fc36.x86_64.drpm: done   
        (33/35): vlc-core-30.255.87.135-1.fc36.x86_64.rpm    1.0 MB/s | 9.7 MB     00:09    
        (34/35): kernel-core-5.17.11-300.fc36.x86_64.rp 3.3 MB/s |  46 MB     00:13    
        (35/35): skypeforlinux_30.040-41-4763-1.x86_64.rpm  5.5 MB/s | 134 MB     00:24    
        /var/cache/dnf/updates-a50f2ed408319fa8/packages/kernel-modules-5.17.9-300.fc36_5.17.11-300.fc36.x86_64.drpm: md5 mismatch of result
        Some packages were not downloaded. Retrying.
        (1/2): kernel-modules-extra-5.17.11-300.fc36.x8 1.7 MB/s | 3.4 MB     00:02    
        (2/2): kernel-modules-5.17.11-300.fc36.x86_64.r 8.3 MB/s |  53 MB     00:06    
        --------------------------------------------------------------------------------
        Total                                           7.2 MB/s | 313 MB     00:43     
        Failed Delta RPMs increased 276.8 MB of updates to 312.6 MB (11.5% wasted)
        skype (stable)                                  6.7 kB/s | 1.7 kB     00:00    
        Importing GPG key 0xDF7587C3:
         Userid     : "Skype Linux Client Repository <cindygarcia@example.com>"
         Fingerprint: D404 0146 BE39 7250 9FD5 7FC7 1F30 45A5 DF75 87C3
         From       : https://repo.skype.com/data/SKYPE-GPG-KEY
        Is this ok [Y/n]: 
        Key imported successfully
        Running transaction check
        Transaction check succeeded.
        Running transaction test
        Transaction test succeeded.
        Running transaction
        
        
    [/code]

Then @ferdnyc (Frank Dana (FeRD)) said

    The deltarpm “bytes wasted” message, definitely nothing to be concerned about. That's just a consequence of having to re-download a full RPM for a package that the delta rebuild failed for. That's the significance of _this_ message:
    
    benny :
    
    > 
    [code]
    >     /var/cache/dnf/updates-a50f2ed408319fa8/packages/kernel-modules-5.17.9-300.fc36_5.17.11-300.fc36.x86_64.drpm: md5 mismatch of result
    >     Some packages were not downloaded. Retrying.
    >     
    [/code]
    
    What that means is that the contents of the `kernel-modules` package for the previous RPM (meaning, the contents of `/lib/modules/5.17.9-300.fc36.x86_64/`) didn't match what was expected. There could be all sorts of reasons for that, depending if you installed any other kernel modules packages, had been running F36 beta before installing the final build, whether or not you even _have_ a `/lib/modules/5.17.9-300.fc36.x86_64/` at all, etc…
    
    But the checksum process did its job, flagged the discrepancy, and downloaded the entire RPM for the new `kernel-modules`. Nothing to worry about, and it's a pretty rare occurrence. (Or, _should_ be. if delta rebuild failures happen **a lot** on your machine then that's worth investigating. But, once in a while is normal.)
    
    Rebuild failures, and the bandwidth they waste, are one of several reasons I'm not real big on deltarpms.

Then @bennyisaiah (benny ) said

    Yes thats correct, I was running the beta version of F36, so that seems to explain why it needed to redownload them. The package manager is very fast now


{'source': 'discourse', 'url': 'https://ask.fedoraproject.org/t/delta-rpms-wasted/22903', 'title': 'Delta rpms: wasted?', 'views': 264, 'has_accepted_answer': False, 'word_count': 1203, 'like_count': 7, 'reply_count': 1, 'participant_count': 2, 'posts': 3, 'tags': 'dnf', 'author': '@bennyisaiah (benny )', 'participants': '@bennyisaiah (benny ), @ferdnyc (Frank Dana (FeRD))', 'image_url': [None], 'created_at': '2022-05-30T02:10:09.181Z', 'last_posted_at': '2022-05-31T12:09:37.789Z'}