On 17 Mar 2008, Jeff Dike verbalised:
> Below is the same patch with another kluge, which cuts down the
> requested sleep by 10% in hopes of getting the actual sleep closer to
> what's wanted.
Eeuuuuw. :)
> This is unusable in anything resembling mainline, but I'd like to see
> how your various systems react to it. I'm getting very close to the
> sleeps I asked for (with slight undersleeping, which is a bug).
OK.
Tests on host with clocksource pit:
bash-3.2# bin/select-sleep 5
Slept for 5 seconds.
bash-3.2# bin/select-sleep 10
Slept for 11 seconds.
bash-3.2# bin/select-sleep 30
Slept for 31 seconds.
bash-3.2# bin/select-sleep 60
Slept for 61 seconds.
... so much better than the 4x error without this patch.
Tests on host with clocksource tsc:
bash-3.2# bin/select-sleep 5
Slept for 5 seconds.
bash-3.2# bin/select-sleep 10
Slept for 10 seconds.
bash-3.2# bin/select-sleep 30
Slept for 30 seconds.
bash-3.2# bin/select-sleep 60
Slept for 61 seconds.
Distinctly better than without this patch.
(Am I the only person who finds it strange that (some) clocksource
hackers are arguing about accuracy problems in the ppm range while we're
glad to get an error of `only' single seconds per minute out of it?
Maybe next year we can invent the `pendulum' clocksource :) )
--
`The rest is a tale of post and counter-post.' --- Ian Rawlings
describes USENET
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
