Distribution kernels and glitch-free (Packagers, read this!)

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On Mon, 23.02.09 10:14, Colin Guthrie (gmane at colin.guthr.ie) wrote:

>
> 'Twas brillig, and Lennart Poettering at 23/02/09 02:05 did gyre and gimble:
>> OpenSUSE apparently does not enable it. The same is true for
>> Ubuntu. Same for Debian. Note sure about Mandriva.
>
> Here is a (not quite current) grep from my running kernel (it's .27 as  
> .28/.29 both break my intel graphics :( at the moment):
>
> $ zgrep -E "HZ|PREEMP" /proc/config.gz
> CONFIG_PREEMPT_NOTIFIERS=y
> CONFIG_NO_HZ=y
> # CONFIG_PREEMPT_NONE is not set
> CONFIG_PREEMPT_VOLUNTARY=y
> # CONFIG_PREEMPT is not set
> # CONFIG_HZ_100 is not set
> # CONFIG_HZ_250 is not set
> # CONFIG_HZ_300 is not set
> CONFIG_HZ_1000=y
> CONFIG_HZ=1000
> CONFIG_MACHZ_WDT=m
>
> I'll ask our kernel team why PREEMPT is not on as I've no idea of the  
> consequences. My guess is that it relates to graphics drivers...

The Fedora kernels set PREEMPT_VOLUNTARY as well as it seems.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4



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