On Tue, Jul 22, 2003 at 03:21:15PM -0400, Timothy Miller wrote:
> This suggests to me that there is one of these possibilities which is
> contributing to the poor performance under Linux:
>
> 1) Linux is not programming the KT400 chipset properly and is thus not
> getting the throughput it could.
Linux doesn't do any chipset specific tuning.
> 2) SANDRA uses instructions (SSE, etc) which are able to access memory
> more efficiently than whatever STREAM is using.
very likely. its the only way to really saturate the bus.
> 3) SANDRA inflates its scores to make people feel better.
unlikely.
> 4) Linux has not properly set up the CPU caches.
Linux doesn't do anything with CPU caches.
> What I want to know is this:
> Am I getting realistic throughput for what STREAM does?
I'm unfamiliar with STREAM, so cannot comment
> What is SANDRA doing that lets it get such high scores when STREAM does not?
Is this even an apples to apples comparison? If not, it's irrelevant.
Dave
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