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Ingo Molnar wrote: > * Theodore Tso <tytso@mit.edu> wrote: > >> If you are always reading from the same small set of files (i.e., a >> database workload), then those inodes only get updated every 5 seconds >> (the traditional/default metadata update sync time, as well as the >> default ext3 journal update time), it's no big deal. Or if you are >> running a mail server, most of the time the mail queue files are >> getting updated anyway as you process them, and usually the mail is >> delivered before 5 seconds is up anyway. >> >> So earlier, when Ingo characterized it as, "whenever you read from a >> file, even one in memory cache.... do a write!", it's probably a bit >> unfair. Traditional Unix systems simply had very different workload >> characteristics than many modern dekstop systems today. > > yeah, i didnt mean to say that it is _always_ a big issue, but "only a > small number of files are read" is a very, very small minority of even > the database server world. OTOH, consider a popular Linux task, web serving. atime results in a lot of unnecessary disk traffic. Jeff - 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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