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Re: [Xen-devel] FreeBSD PVHVM call for testing

On Jun 19, 2013, at 10:50 AM, Jeroen van der Ham <jeroen@xxxxxxx> wrote:

> Hi,
> On 19 Jun 2013, at 18:15, Justin T. Gibbs <gibbs@xxxxxxxxxxx> wrote:
>> I've never seen a kernel build take 2 hours, much less 2 hours *longer*.  
>> Are you talking about buildworld?  It would be interesting to know your 
>> results building stable/9 sources in your 10 environment to see if this is 
>> just due to "build bloat" or a true performance regression.
> I copy/pasted the command from the wiki:
>> # make kernel-toolchain && make buildkernel KERNCONF=XENHVM && make 
>> installkernel KERNCONF=XENHVM
> On the stable/9 I only did 
>> make buildkernel KERNCONF=XENHVM && make installkernel KERNCONF=XENHVM
> I guess the kernel-toolchain takes a long time to build…and from what I can 
> see it does a clean before rebuilding also.
> I'm doing the kernel-toolchain step only now and will report how long it took.
> Jeroen.

Oh.  Without any parallelism (-j X), the build will take a really long time.  
Even with only one core, you'll get a large speedup by performing a parallel 
build since many steps of the build are I/O bound.

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