Re: [REPORT] cfs-v4 vs sd-0.44

Denis Vlasenko
2007-04-21T22:55:10Z

On Saturday 21 April 2007 18:00, Ingo Molnar wrote:
> correct. Note that Willy reniced X back to 0 so it had no relevance on
> his test. Also note that i pointed this change out in the -v4 CFS
> announcement:
>
> || Changes since -v3:
> ||
> || - usability fix: automatic renicing of kernel threads such as
> || keventd, OOM tasks and tasks doing privileged hardware access
> || (such as Xorg).
>
> i've attached it below in a standalone form, feel free to put it into
> SD! :)

But X problems have nothing to do with "privileged hardware access".
X problems are related to priority inversions between server and client
processes, and "one server process - many client processes" case.

I think syncronous nature of Xlib (clients cannot fire-and-forget
their commands to X server, with Xlib each command waits for ACK
from server) also add some amount of pain.
--
vda