> On Fri, Jun 5, 2020 at 4:35 AM Vitaly Zaitsev via devel > <devel(a)lists.fedoraproject.org> wrote: > > Already discussed in the 'support hibernation' thread. > > Most laptops today have UEFI Secure Boot enabled by default and > therefore hibernation isn't possible. And even when the laptop doesn't > have Secure Boot enabled, there's a forest of bugs. It works for some > people and not others. It was working for me on one laptop in > February, consistently doesn't work now and I haven't gotten a reply > yet from upstream about the problem. > > > I am a fan of zswap too, but it needs deconfliction logic with > swap-on-zram. The generator would need to come after the > fstab-generator, so that it could know if there is a swap-on-drive > partition. From that it could do swap-on-zram if there is no > swap-on-drive. And setup zswap if there is (instead of two swap > devices). The kernel has support for 32 swap devices, since almost > forever. > > I've done enough testing with zswap in all the same conditions I've > used zram, that I'm confident this can be implemented with this > feature in the F33 time frame. But someone needs to help out with the > zram-generator code to teach it how to use zswap. There is a sysfs > interface to do it so that's pretty straightforward and I think that's > how zram-generator does things now for zram, it's not yet using > zramctl for setup. > > I can plan to have supplementary tests for zswap on the test day. > Hypothetically zswap is a bit smarter because of the LRU basis it uses > to decide what to toss out of the memory cache to the swap-on-drive. > Whereas two swaps where /dev/zram0 has higher priority, gets favored > until it's full, then uses /dev/swapondrive. But in my testing I > haven't been able to prove zswap is better. Well, recent articles on LWN mention a spike in interest to hibernation¹, so I'd expect hibernation to get improved. And I'm not sure it's fair to rule out hibernation forever because of existing problems on some hw setups. Windows 10 has by default a thing called "fast startup" which is AFAIK simply hibernation. If that works for them, I guess we can make it too? 1: https://lwn.net/Articles/821158/ _______________________________________________ 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
