On Mon, Mar 18, 2013 at 7:40 PM, Kok, Auke-jan H <[email protected]> wrote: > On Sun, Mar 17, 2013 at 6:54 AM, Kay Sievers <[email protected]> wrote: >> Here is a chart: >> http://people.freedesktop.org/~kay/bootchart-20130317-1434.svg >> >> Rotating media and really cheap hardware looks very sad, and we take >> like 5 times longer to boot than Windows 8. > > I've seen many charts like that - in most of them it appears like > readahead isn't helping at all.
Yeah, it actually hurts, it's faster without it. I put an SSD in that crappy box today; it's down from 25 to 7 sec on the otherwise identical system. :) So I'll not need to debug any rotating media issues, I don't have any of them again. :) >> Why does bootchart stop before all the *really* slow desktop stuff starts? > > There's some rework needed to make it stop in the same way that e.g. > the readahead collector works - right now it just runs for 20 seconds > or so and exits. This is on my work list to fix. Ah, yeah, systemd can probably supply that info. >> Why does bootchart claim an idle time of ~5 sec, not that I wouldn't >> like that, but .... :) > > That's when the CPU are below a certain percentage(somewhere below 1%) > for a certain time (0.5sec)... enough to call "idle". Usually this > happens when there is really slow IO. It bears no correlation to the > systemd state. I see. The heavy concurrency of systemd with a filesystem that does not optimize itself for that, just isn't working too well on rotating media. :) Kay _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
