Colin Percival
9a0b9a23e0
FreeBSD VM/cloud images tend to be highly compressible: The generic VM images compress roughly 3.5:1, and cloud images typically even more since they have significant unused space in their virtual disks. This generally doesn't matter for users who can download compressed release images and extract them locally, but for EC2 in particular relying on uncompressed image formats is painful: We now upload over 500 GB/week to AWS. This commit adds the "stream-optimized" version of the VMDK format, which compresses each 64 kB "grain" individually (and omits grains which are all zeroes). Compared to uncompressed formats, this can produce much smaller images; experiments indicate that using this format for EC2 image uploads will reduce the weekly traffic to under 100 GB/week. Co-authored-by: Claude Opus 5.5 MFC after: 2 weeks Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D60151
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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