BMITU

Sun Sep 7 05:11:41 UTC 2003

> Qmail doesn't scale well with large injection rates.  Qmail
> scaling in that sort of manner is completely dependant upon
> the filesystem.  Now this may have changed, but not that long
> back everything in submission was in one dir, processing in
> another dir, just like sendmail (by default) does.  This
> caused the queue manager to stuff up something wicked at high
> injection rates.

Hans Reiser would argue that that reflects a limitation of the
filesystem, rather than of qmail; and that apps should not
have to code around such unreasonable filesystem limitations.
And reiserfs goes to considerable effort to achieve good
performance on directories containing thousands of small
files.

This would imply that if you're going to use qmail in a high-volume
environment, you might consider using reiserfs, also.

Jim Shankland