On Wed, Feb 3, 2021 at 5:54 PM Michael Catanzaro <mcatanz...@gnome.org> wrote:
> Hi, > > Has anybody investigated Jim Salter's claims that Fedora 32 is slow to > launch applications? Recent article: > > > https://arstechnica.com/gadgets/2021/02/ubuntu-core-20-adds-secure-boot-with-hardware-backed-encryption/ > > "in my experience, Fedora 32 is noticeably, demonstrably more sluggish > to launch applications than Ubuntu is in general." > > Original article: > > > https://arstechnica.com/gadgets/2020/05/linux-distro-review-fedora-workstation-32/ > > Would be good to know, for starters, whether this difference is real > and measurable. > This was bugging me for a while. I also noticed that Fedora 32 is a bit slower than it used to be. Compilation time of a project that I'm working on went from ~35-36 seconds to ~47-48. At first I thought that it's just another round of CPU vulnerabilities mitigations that introduced a performance drop. But after some digging I found that the default CPU governor was switched from 'ondemand' to 'schedutil' in Fedora kernel 5.9.7: https://src.fedoraproject.org/rpms/kernel/c/73c86ebaee23df8310b903c1dab2176d443f5a3a?branch=rawhide (see configs/fedora/generic/CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL) I switched it back using cpupower from kernel-tools: $ sudo cpupower frequency-set --governor ondemand And confirmed that my compilation time went back to the previous ~35 seconds. In the end I switched the governor to 'performance' and shaved another 5 seconds. And gnome-shell no longer feels sluggish, switching tabs in the browser is also instant. To make the change permanent I used settings in /etc/sysconfig/cpupower and enabled cpupower service: $ sudo systemctl enable --now cpupower.service The change of the default CPU governor looks pretty significant to me, but I couldn't find any discussions about it. > Michael > > _______________________________________________ > 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 > -- Viktor
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