Hans, Hans Harder wrote: > Jan, > > never looked at it, seems it was default on. > When I test it with or without readahead, it makes no difference. > > Hans
I would not expect to see a performance difference depending on whether read-ahead was on or off if the test method is hdparm -tT, because I believe that it only tests sequential reads anyway. Any difference would only be discernable in a test that involves significant seeking. I'm just wondering whether, on a solid state device, it makes sense to invest in read-ahead in order to avoid the situation where a process is accessing a file sequentially, but another process is causing the "heads" to be moved to another "cylinder" before the first process has a chance to access the next sector which would have been possible without moving the heads in the first place. Such a speculative investment aimed at avoiding needless seeks probably makes less sense on a solid state device than on a physical disk. But the above is theory; I'd be interested in real-world opinions. Cheers, Jan _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
