On Fri, Dec 9, 2022, at 7:30 AM, Ray Strode wrote: > Hi, > > On Thu, Dec 8, 2022 at 2:55 PM Adam Williamson > <adamw...@fedoraproject.org> wrote: >> This is the direction Daniel was thinking down. I'm waiting for someone >> with more expertise to reply, but I suspect the reply is going to be >> along the lines of "yes, we *can* do that, but it's somewhat tricky >> work that involves thinking about lots of paths that aren't obvious, >> and somebody would need to dedicate their time to working on that". > Presumably we could package the firmware separately and just unpack it > into place from a udev rule when the hardware is detected? > > But first, do we actually know this is a problem? > I think you're saying squashfs loads the whole decompressed image into > memory, but my expectation prior to your mail was that it performs I/O > on the usb stick (with a cache in between). If my intuition was right > and files only hit ram when accessed, then it seems like this is > pretty much not an issue, right?
From a certain point of view there's a potential inefficiency with squashfs reads in that there's a minimum block size that it needs to read in order decompress its 128 KiB block. It's possible quite a lot of what's decompressed isn't (immediately) needed. But it's still a random access file system. It's not necessary to read the whole image into RAM. Repo metadata is the big hit for netinstall because it's downloaded into /tmp which is tmpfs. And DVD already has repomd on it, and only downloads more if you enable some other repo. Live doesn't need repomd. So initially netinstaller uses less memory up until the the Anaconda language selection screen appears, at which point it starts background downloading repomd. It quickly catches up to, and surpasses, Live media memory consumption. Off hand, I'm not sure what's producing all the anonymous pages during Live installation but it's a fairly linear increase as the installation progresses. Since it's an rsync based installation, I'm currently frownie facing pondering the cause of the anon page explosion. -- Chris Murphy _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
