[ros-kernel] Re: Filesystem cache

[Hartmut B. <har...@te...>]

Vfatfs hasn't a real file cache like NT. When a file is opening, vfatfs 
uses cached directorie data. But the file/dir info functions doesn't use 
the cache. At the moment, vfatfs doesn't free memory from cached directorie 
datas. When the file info functions uses cached directorie data, a simple 
'dir /s' (from cmd.exe) reserves ca. 25MB for a partition with 100000 
files.

- Hartmut

> -----Ursprungliche Nachricht-----
> Von:	Phillip Susi [SMTP:ps...@cf...]
> Gesendet am:	Sonntag, 30. September 2001 16:47
> An:	ros...@re...
> Betreff:	[ros-kernel] Re:  Filesystem cache
>
> I'm not sure, but I think that sometimes the directory data is cached, 
such
> as when opening files or changing directories, it does not seem to read 
the
> disk, but when doing a simple dir command, there is intense disk IO and
> each file in the directory is printed one at a time, very slowly, as if 
it
> were still reading in a sector from the disk for each file found in the
> directory.
>
> At 11:52 AM 9/30/2001 +0100, you wrote:
> >On Sat, Sep 29, 2001 at 09:54:15PM -0700, Rex Jolliff wrote:
> > >
> > > I thought I was done with this.  Perhaps I missed something, or 
subsequent
> > > changes
> > > altered the behaviour of the caching code.  I am not currently 
working on
> > > this.  I seem
> > > to remember that someone else picked up the vfat driver.  Perhaps 
this
> > > person will
> > > look into this.  If not, I can take a look.
> > >
> >The vfat directory read code uses the interfaces for reading file data 
so
> >it does go through the cache but it doesn't operate directly on the 
cached
> >data so it is less efficent.

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