kernel log buffer size (also default HZ)...

Daniel J Blueman daniel.blueman at
Mon Sep 28 16:25:48 UTC 2009

Hi Tim,

On Mon, Sep 28, 2009 at 3:39 PM, Tim Gardner <tim.gardner at> wrote:
> Daniel J Blueman wrote:
>> Separately, upstream moved to using HZ=100 on x86(-64) (see benchmark
>> improvement at, 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
> 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.

Great; I've logged this as:

Thanks again,
Daniel J Blueman

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