Control: tag -1 wontfix On Tue, 06 Oct 2020 12:24:07 -0400 calumlikesapple...@gmail.com wrote: > I figured I should ping this, since I don't know that it was properly > shown to the debian-kernel mailing list. > > > Interestingly it still contains the following note in documentation: > > > Zswap is a new feature as of v3.11 and interacts heavily with > > memory reclaim. This interaction has not been fully explored on > > the large set of potential configurations and workloads that > > exist. For this reason, zswap is a work in progress and should be > > considered experimental. > > > Unless this is not anymore to be considered valid, then > > CONFIG_ZSWAP_DEFAULT_ON could be switched on (which should be > > possible since 5.7-rc1). > I saw that as well. However, zswap has gone through a lot of changes > since then: it is enabled by default on Arch at least, and possibly > more distributions (I couldn't find the kernel config file for RedHat).
It's part of <https://src.fedoraproject.org/rpms/kernel>. This option is not enabled in any configuration there. SUSE kernel configurations are part of <https://github.com/openSUSE/kernel-source> and they don't enable it either. The latest Ubuntu kernel package <https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/linux/5.15.0-35.36+22.10.1/linux_5.15.0-35.36+22.10.1.dsc >doesn't enable it either, though I understand that it's enabled for some systems through the kernel command line. > The feature is still maintained, and appears to be bug-free. I'm > having a hard time seeing the disadvantage of enabling it. "Bug-free", ho ho. <https://linuxreviews.org/Zswap> has a benchmark whee zswap can improve or worsen performance, depending on configuration. Frustratingly, that page doesn't show results for the default configuration (lzo compressor and zbud allocator). I'm sure it's a useful feature for some systems, but I think it needs updated documentation and a more consistent performance benefit before we could enable it by default. Ben. -- Ben Hutchings Q. Which is the greater problem in the world today, ignorance or apathy? A. I don't know and I couldn't care less.
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