[yocto] Performance improvements and machine build configuration

[McClintock Matthew-B29882]

On Tue, Oct 23, 2012 at 4:24 PM, Ross Burton <ross.burton at intel.com> wrote:
> On Tuesday, 23 October 2012 at 22:19, McClintock Matthew-B29882 wrote:
>> On Tue, Oct 23, 2012 at 1:45 PM, Elvis Dowson <elvis.dowson at gmail.com (mailto:elvis.dowson at gmail.com)> wrote:
>> > The only curious thing that I've noticed is that I don't see a large performance improvement using a standard 3TB Seagate Barracuda 7200 RPM HDD, and the two Intel Series 330 SSDs in a striped RAID0 configuration. The read (600MB/s) / write (838MB/s) figures are impressive, although I expected the read performance to be higher than write performance, as is normally with a single SSD. I'm using the motherboard's hardware RAID support on a 6GB/s SATA 3 port.
>>
>>
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>> You probably don't use much disk I/O with 16GB of memory for a build.
> My machine has 16G of RAM, and after a good build will have 12G of "cache" (according to /proc), but the disk activity light was frantic.  I can only imagine it would be more frantic with less RAM to act as an over-sized disk cache.

Frantic but was it actually limiting the build time? It would seem not
according to Elvis observations.

-M