On Mon, Jan 11, 2021 at 1:55 PM ElXreno <elxreno@xxxxxxxxx> wrote: > I think it's a bad idea. It is better to make `zram-fraction` equal to > 0.8 or 0.9, but not 1.0. Just to clarify. zram-fraction 1.0 means the zram *device size* will be equal to RAM, capped at 8G. The actual amount of memory used is zero, until the kernel starts to evict dirty pages to swap, where they are then compressed. And the maximum amount of RAM due to compression would be predicated on compression ratio. If we assume a conservative 2:1 ratio (compression results in 50% of original size), the max ram would be the lesser of 4G or 50% of RAM. Does this reduce your concern? 80% might still be reasonable, and still pretty conservative. > For example, if you run Darktable, load a floating-point TIFF image into > it, and try to export it, on systems with little RAM, it will fill both > RAM itself and zram, and cause the system to freeze completely because > the memory is almost incompressible. > Also, other data (video editors, for example) which are not compressible > can get into RAM. Are you sure that this data is compressed in memory as well as the on-disk encoding? The editing operations themselves surely operate on uncompressed data, and then it's compressed upon being written to disk. -- Chris Murphy _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
