Re: trace default?

[Rob Gardner <rob.gardner@hp.com>]

Keir Fraser wrote:

>
> On 6 Sep 2005, at 23:51, Rob Gardner wrote:
>
>> The xen trace facility is not enabled by default. I'm working on some 
>> tools that use it, and I'm concerned that the tool will not work for 
>> customers who buy packaged distro's. What are the arguments for 
>> keeping trace disabled? Is it just the memory consumed by the trace 
>> buffers? It doesn't appear to me that there would be any impact 
>> beyond that. What is the possibility of making tracing enabled by 
>> default?
>
>
> It's up to the distros to decide what options they anable in their 
> default Xen package imo.


Yes, but they are likely to stick with the xen defaults unless they have 
a reason for changing them. In the case of tracing,  their reaction is 
likely to be that "tracing" sounds like some debugging feature, will 
probably be bad for performance, so let's leave it turned off. So could 
you state what performance impact you think tracing will actually have 
on the system?

Thanks,
Rob