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

Tim Gardner tim.gardner at canonical.com
Tue Sep 29 02:35:27 UTC 2009


Daniel J Blueman wrote:
> Hi Tim,
> 
> On Mon, Sep 28, 2009 at 3:39 PM, Tim Gardner <tim.gardner at canonical.com> wrote:
>> Daniel J Blueman wrote:
>>> 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:
>>>
>>> http://groups.google.com/group/linux.kernel/browse_thread/thread/e6b370e71ddfe153/f164d6068360b034?#f164d6068360b034
>>>
>>> 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:
> 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/438234
> 
> Thanks again,
>   Daniel

applied

-- 
Tim Gardner tim.gardner at canonical.com




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