Messages in this thread | | | Date | Tue, 7 May 2013 16:48:34 -0400 | Subject | readahead window size benchmarking | From | yan cui <> |
| |
Dear all:
I am new to the Linux readahead system. After reading the recent kernel code (3.8.8), I find there is an initial window size decided based on the read size. And it will increase the window size to a maximal value (32 pages) if the detected reading is sequential. To me, the window size seems an important parameter to performance. However, after testing using some home-made micro-benchmarks, I find that performance is not sensible to this parameter. So, I wonder to know what benchmarks (or applications) do you use to test the performance difference when using different window size? Why not just use the fixed window size (e.g., 32 pages)?
Thanks, Yan
-- Think big; Dream impossible; Make it happen.
| |