On Fri, Dec 07, 2012 at 04:42:06PM -0500, Ric Wheeler wrote: > The other things that I think we should try would be to convert over > larger chunks as we discussed on the list back in the summer (just > because the user writes 4KB does not mean that we cannot flip over > 1MB and zero that). Writing a megabyte is not free. If you assume that your HDD has a sustained write throughput of 100-125 MB/s, writing a megabyte will take 8-10ms. It might be a win if you amortize it over a large number of writes, but it doesn't help your 99.9 percentile latency numbers. (99.9 percentile latency numbers matters because eventually you'll have a user request which hits multiple serial long latency operations, and then the delay looks **really** user visible.) - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
