Messages in this thread | | | Date | Sun, 5 Aug 2007 19:55:47 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 00/23] per device dirty throttling -v8 |
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* 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.
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