kernel log buffer size (also default HZ)...
stefan.bader at canonical.com
Tue Sep 29 07:38:29 UTC 2009
Tim Gardner wrote:
> Daniel J Blueman wrote:
>> Hi guys,
>> CONFIG_LOG_BUF_SHIFT=17 is too small when debugging certain types of
>> kernel issue. I've raised a report at:
>> Since it's a zero-risk and lean change, how much chance is there to
>> get it in Karmic, in order to make bug-catching easier, as it's easy
>> to stumble on this?
>> Separately, upstream moved to using HZ=100 on x86(-64) (see benchmark
>> improvement at http://lwn.net/Articles/331607/), due to all
>> performance-affecting timers being asynchronous (via hrtimers and
>> tickless). I raised the discussion at:
>> Is thus seems reasonable to bring the benefit to Ubuntu, keeping it
>> more competitive with other distros/OSs. Is this possible?
> I've actually been considering this for amd64 because you're pretty much
> guaranteed to have an HPET. I think I would just as soon leave i386 and
I will be able to give you testing on this on a system which has not (yes,
those exist). ;-)
> lpia as they are since many of those platforms either have buggy HRES
> timer sources, or have none at all. I'll have to rely on other folks to
> tell me about the ports architectures (sparc, ia64, powerpc).
> Please start a tracking bug for this issue since we are in beta freeze.
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