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    SubjectRe: [PATCH 00/23] per device dirty throttling -v8
    On Sat, 4 Aug 2007 18:37:33 +0200 Ingo Molnar <mingo@elte.hu> wrote:

    >
    > * Linus Torvalds <torvalds@linux-foundation.org> 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,

    Not just more IO: it will cause great gobs of blockdev pagecache to remain
    in memory, too.


    > 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%)
    >
    > Ingo
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