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SubjectRe: Why the DOS has many ntfs read and write driver,but the linux can't for a long time
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On Mon, 2006-01-09 at 11:19 -0500, Lee Revell wrote:
> On Mon, 2006-01-09 at 17:14 +0100, Oliver Neukum wrote:
> > Am Montag, 9. Januar 2006 17:04 schrieb Lee Revell:
> > > On Mon, 2006-01-09 at 17:02 +0100, Oliver Neukum wrote:
> > > > Am Montag, 9. Januar 2006 16:15 schrieb Lee Revell:
> > > > > On Mon, 2006-01-09 at 15:28 +0100, Oliver Neukum wrote:
> > > > > > Am Montag, 9. Januar 2006 15:18 schrieb Robert Hancock:
> > > > > > > Yaroslav Rastrigin wrote:
> > > > > > > > Well, I could find more or less reasonable explanation of this behaviour - different VM policies of two OSes and
> > > > > > > > strangely strong and persistent belief "Free RAM is a wasted RAM" among kernel devs. Free RAM is not a wasted RAM, its a memory waiting to be used !
> > > > > > > > Whenever it is needed by apps I'm launching or working with.
> > > > > > >
> > > > > > > There is no different VM policy here, Windows behaves quite similarly.
> > > > > > > It does not leave memory around unused, it uses it for disk cache.
> > > > > >
> > > > > > That doesn't mean that the rate of eviction is the same.
> > > > > > Is it possible that read-ahead is not aggressive enough?
> > > > >
> > > > > Enough for what? What is the exact problem you are trying to solve?
> > > >
> > > > Quicker application startup.
> > >
> > > Why do you look to the kernel first? The obvious explanation is that
> > > Linux desktop apps are more bloated than their Windows counterparts.
> >
> > It is the most efficient place. An improvement to the kernel will improve
> > all starting times.
>
> I think you'll get at most a 10% or 20% speedup by improving the kernel,
> while some of these apps (think Nautilus vs Windows Explorer) will need
> to be 1000% faster to seem reasonable to a Windows user.

That's easy: Just start nautilus, OOorg, Firefox, a java-vm and
GNOME/KDE infrastructure at login time in the background (*eg* and
mlockall() the more important ones so that the are surely in RAM) and
"starting the app" is only a small program connecting to the respective
process to get a fork() there (e.g. like the "-remote" parameter in the
Mozilla family).

Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services

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