Re: powerpc64 head -r344018 stuck sleeping problems: th->th_scale * tc_delta(th) overflows unsigned 64 bits sometimes [patched failed]
Ian Lepore <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.ppc,gmane.os.freebsd.devel.hackers |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 2019-03-01 at 20:57 +0000, Poul-Henning Kamp wrote: > -------- > In message <[email protected]>, Mark > Millard via freebsd-hackers writes: > > > > I must admit that 2 seconds of interval where the timehands where > > > not updated is too much. > > I have no idea how you got in that situation, but it is very far > from how timecounters were designed to work. > I wonder if it's fallout from reducing the number of timehands to 2, which always struck me as a really bad idea. I know of at least one arm configuration which fails because of it (it takes a combo of a single- core system, and a pps capture driver that uses hardware latching of the timer and the polling method for reading the latched value; given all that, at least 4 sets of timehands are needed to avoid losing PPS events due to generation changes). -- Ian _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-ppc To unsubscribe, send any mail to "[email protected]"