Messages in this thread | | | From | "Chen, Kenneth W" <> | Subject | RE: [patch] rearrange kioctx and aio_ring_info | Date | Thu, 12 Oct 2006 17:20:52 -0700 |
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Dave Jones wrote on Thursday, October 12, 2006 5:04 PM > 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 ?
Not yet, I just queued up experiment on our internal benchmark setup. I posted the patch here to get some early discussion on how to attack the problem. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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