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    SubjectRe: [PATCH 00/23] per device dirty throttling -v8

    * Linus Torvalds <> wrote:

    > > hm, it turns out that it's due to vim doing an occasional fsync not
    > > only on writeout, but during normal use too. "set nofsync" in the
    > > .vimrc solves this problem.
    > Yes, that's independent. The fact is, ext3 *sucks* at fsync. I hate
    > hate hate it. It's totally unusable, imnsho.

    yeah, it's really ugly. But otherwise i've got no real complaint about
    ext3 - with the obligatory qualification that "noatime,nodiratime" in
    /etc/fstab is a must. This speeds up things very visibly - especially
    when lots of files are accessed. It's kind of weird that every Linux
    desktop and server is hurt by a noticeable IO performance slowdown due
    to the constant atime updates, while there's just two real users of it:
    tmpwatch [which can be configured to use ctime so it's not a big issue]
    and some backup tools. (Ok, and mail-notify too i guess.) Out of tens of
    thousands of applications. So for most file workloads we give Windows a
    20%-30% performance edge, for almost nothing. (for RAM-starved kernel
    builds the performance difference between atime and noatime+nodiratime
    setups is more on the order of 40%)

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      Last update: 2007-08-04 18:41    [W:0.040 / U:10.040 seconds]
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