-------- In message <1419224743.1018.108.ca...@freebsd.org>, Ian Lepore writes:
>On Sun, 2014-12-14 at 10:32 +0000, Poul-Henning Kamp wrote: >> The rotating swirlie ('-/|\') in the loader accounts for a surprisingly >> large part of our boot time on systems with slow-ish serial consoles. >> >I investigated this a bit today. I instrumented the loader on arm to >count how many times twiddle() is called while loading a 5.5MB kernel. >When loading over NFS it was called 5580 times. When loading from an >sdcard it was called 284 times. It would be plenty if it twiddled once per second, in fact it would probably be much better if it *only* twiddled once per second, because the at least people could count the steps and gain some idea where in the process the problem is. >So all in all it seems like different kinds of IO need different >throttling, something like the attached (which also still has some stats >output in it). I can't decide if it's worth committing... it'll have a >lot of value to someone with slow serial and netbooting, is that common? How about a compile time "global" divisor so people can reduce it even further ? But even without that: Please commit -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"