On Mon, Jun 8, 2020 at 4:54 PM Konstantin Kharlamov <hi-angel@xxxxxxxxx> wrote: > So, I am testing ZRAM right now (as per your advice in another thread). All well > so far, however reading this makes me think I gonna stumble upon a point where > ZSRAM will be a better fit. > > You see, the idea of ZRAM and ZSWAP is improving low-memory situation. This is > especially relevant for small amount of RAM, like your Raspberry example. > > In such situation if you, for example, open a lot of tabs in a browser, you may > easily get to a point where even ZRAM is exhausted. Now, had you additionally a > SWAP device, it would be no problem, the data would simply spill over to SWAP. > > Yes, SWAP is slow (well, it is on HDD at least). But consider this: in this > workload , you most likely not gonna touch older of browser tabs for quite some > time, so the slowness won't hurt you. SD Cards are pretty slow in Pi's. And also they have much more limited wear endurance than laptop SSDs. So in this use case for sure, memory based swap only is idea. If it's not enough, then I think I've reached the physical limits of the configuration. But how to make this more dynamic and smarter is certainly an area worth exploration, including the idea of creating swapfiles on demand. But that is beyond the scope of this feature change. > Now, I love the idea of using either ZRAM or ZSWAP. But to consider which one of > them do we want, I think we would need to discuss first: do we really want to get > rid of disk swap? Hibernation being discussed somewhere in this thread is another > point. I personally don't like idea of removing disk swap. It is worth continuing the discussion. But for non-hibernation and incidental swap, taking up more than 4G of swap seems excessive and only leads to slow systems that will never OOM until all of the swap partition is full. -- 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
