Re: Question about Reiser4

[H. Peter Anvin]

Theodore Tso wrote:
> One of the big problems of using a filesystem as a DB is the system
> call overheads.  If you use huge numbers of tiny files, then each
> attempt read an atom of information from the DB takes three system
> calls --- an open(), read(), and close(), with all of the overheads in
> terms of dentry and inode cache.

Now, to be fair, there are probably a number of cases where 
open/lseek/readv/close and open/lseek/writev/close would be worth doing 
as a single system call.  The big problem as far as I can see involves 
EINTR handling; such a system call has serious restartability implications.

Of course, there are Ingo's syslets...

	-hpa
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