Messages in this thread | | | Date | Thu, 12 Oct 2006 20:03:47 -0400 | From | Dave Jones <> | Subject | Re: [patch] rearrange kioctx and aio_ring_info |
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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
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