On Mon, 2017-01-16 at 20:19 -0500, Matthew Miller wrote: > On Mon, Jan 16, 2017 at 06:07:42PM -0600, Michael Catanzaro wrote: > > http://www.hecticgeek.com/2016/12/fedora-25-review/ > > It includes a couple recommendations: > > * We should restore systemd-readahead to speed boot time by ~30% > > for > > users without SSDs. Endless has a downstream patch for this. Or we > > could use Ubuntu's readahead utility. > > Has Endless done benchmarks? I'd hate to renable it based mainly on > anecdotes. I don't know. I think their benchmarks would not be super relevant to us anyway, since they are targeting extremely low-end hardware; I would be unsurprised if readahead is far more important for Endless than it is for Fedora. But this reviewer has taken measurements (the basis for that 30% number). They're at the bottom of his Fedora 25 review. They are not super scientific, because they are comparing Fedora to Ubuntu, but this same reviewer also reviewed Fedora 22 a while back with and without readahead. His boot took 38 seconds without readahead and 28 seconds with readahead. It is an anecdote, since it's only tested on one single computer, but the difference is quite major: http://www.hecticgeek.com/2015/06/fedora-22-review/ > Same point about benchmarks applies here, although it's a lot less > work > to experiment with and the consequences easily reversed. FWIW, RHEL 7 > defaults to deadline on all devices except SATA disks, which default > to > CFQ. And on virtual disks, you get no IO scheduling at all, which > makes > sense and makes this irrelevant in those cases. Very interesting that our behavior is different from RHEL! Michael _______________________________________________ desktop mailing list -- desktop@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to desktop-leave@xxxxxxxxxxxxxxxxxxxxxxx
