This issue tracks the release note for the following Fedora Change:
NSS Default File Format SQL
owned by @kengert
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Metadata Update from @rkratky:
- Issue assigned to rkratky
Could you please write release notes with the following information?
The library Network Security Services (NSS), which is used by Mozilla Firefox, Gnome Evolution, Mozilla Thunderbird and other applications, changed its default database format for storing keys, certificates and trust information. The new database format is based on SQlite and uses the filenames cert9.db, key4.db and pkcs11.txt. The previous database format used Berkeyley DB (DBM) and filenames cert8.db, key3.db, secmod.db
The primary benefit of the SQlite storage is support for concurrent access by multiple applications. When using the previous default file format based on DBM, accidental concurrent access could result in corrupted storage.
Unless an application explicitly requests either the DBM or SQL format, the NSS library will automatically migrate the application's NSS database from the old to the new format. The old database files will not be updated further. Most users should not experience differences in operation. Applications that perform many NSS read/write operations may experience a minor performance decrease.
Users, who store their system home or application data directory on a network filesystem, are advised to set the following environment variable NSS_SDB_USE_CACHE=yes prior to starting applications that use NSS. Without setting this environment variable, users of network filesystems may experience a major slowdown with some applications, such as Firefox. The environment variable enables the use of a caching strategy in NSS, that works around the slowness of network filesystems. Because this caching strategy causes a performance decrease on fast filesystems, it isn't used by default, but requires users to explicitly enable it by setting the environment variable.
Additional technical details can be found in the Fedora Wiki: https://fedoraproject.org/wiki/Changes/NSSDefaultFileFormatSql
Unless an application explicitly requests either the DBM or SQL format
Unless an application explicitly requests the DBM format
Suggested addition for the release-notes/en-us/desktop/Desktop.adoc :
== Slow Firefox performance with network filesystems
If a user's home directory is on a network filesystem such as NFS, SMB, CIFS etc., users of Firefox may experience a major performance regression. As a workaround, set the following environment variable prior to starting Firefox: NSS_SDB_USE_CACHE=yes
In order to set the environment variable, it is advisable to add the following line to the user's $HOME/.bashrc file, and to either reboot or log out and log back in to Fedora: export NSS_SDB_USE_CACHE=yes
The same recommendation applies to all Mozilla applications.
Merged in #117
Metadata Update from @pbokoc:
- Issue status updated to: Closed (was: Open)
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