Re: DEVFSv50 and /dev/fb? (or /dev/fb/? ???)
H. Peter Anvin (hpa@transmeta.com)
7 Aug 1998 04:24:02 GMT
Followup to: <199808061810.OAA00880@jupiter.cs.uml.edu>
By author: "Albert D. Cahalan" <acahalan@cs.uml.edu>
In newsgroup: linux.dev.kernel
>
> >> getting, *long wait* that it might have sounded like. I meant that little
> >> bit of time spent is unnecessary. Bigger deal for some than others, no?
> >
> > You really don' t understand that the inode lookup time is not an issue.
> > Please really stop using it as and argument in favor of devfs.
>
> No, you don't understand. It has nothing to do with "ls /dev".
>
> Many programs need to search through /dev. That includes lilo, the
> whole procps package, stuff related to the talk daemon, etc.
>
> That's not even the worst of it. Every time you open a pty, you need
> access /dev. Every time you want /dev/null or /dev/zero, you access /dev.
>
> The result: general system slowdown. You can't point a finger at
> the problem ("we lost 23 seconds RIGHT THERE because /dev was slow")
> but you suffer anyway.
>
> Hey, Linus! It looks like a latency problem.
>
This is what the dcache is for.
-hpa
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