On 29/08/2013 03:32, Dewayne Geraghty wrote: > From the analysis perforned in 2009, and referenced earlier by Robert, this > https://wiki.freebsd.org/DirhashDynamicMemory and other material at this site, > indicates that the reclaimage interval is workload dependent and that 5 to 8 > seconds seems, on average, to be adequate.
I'm having trouble understanding what the graphs are saying - you seem to have almost consistently worse results with increasing dirhash memory and/or reclaim age. > Is the discussion, rather than (synthetic) workload > performance, sufficient to warrant changing the default settings by a factor > of 12? Yes, and also for an additional reason on top of what I've already said in @fs and @hackers: it will be at least 10 years before someone remembers to bumb this tunable again, so I consider a little overkill to be ok.
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