| Headlines |
| 2021-01-11 |
Fedora considers expanding zRAM usage |
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The Fedora distribution introduced running zRAM in memory to provide compressed swap space in Fedora 33. At the time the memory space set aside for compressed swap was a fraction of the system's total memory size, but now the developers are considering expanding the amount of memory which can be used for zRAM. "When ZRAM was enabled by default in Fedora 33, the size of the device (before compression) was limited to fraction 0.5 of RAM or 4 GiB, whichever is less. The reason to limit the fraction to less than 1.0 is that with only incompressible data in memory, whole RAM would be filled by the "compressed" pages, leaving no RAM for normal use. But this concern seems to have been overblown, and there have been no reports of compressed swap taking up too much memory. In real use, we will have at least a few hundred MiB of code in memory, which compresses quite well, so some compression will occur even when working with incompressible data." Ben Cotton has published an overview of this proposed change with more details.
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