On Thu, Oct 12, 2006 at 04:25:54PM -0700, Chen, Kenneth W wrote:
> The following patch is result of our kernel data latency analysis on a
> large database setup (128 logical CPU, 1 TB memory, a couple thousand
> disks). The analysis is done at an individual cache line level through
> hardware performance monitor unit. What we did essentially is to collect
> data access latency on every kernel memory address and look for top 50
> longest average access latency. The hardware performance unit also keeps
> track of instruction address for each collected data access. This allows
> us to further associate each of the top 50 cache lines to instruction
> sequences that caused long latency.
Do you have performance numbers of before/after this change ?
How much is it worth?
Dave
--
http://www.codemonkey.org.uk
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