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Re: intro

From: Sergey Poznyakoff
Subject: Re: intro
Date: Wed, 13 Mar 2002 17:11:38 +0200

> Is MMIO, Memory Map files? if yes we do that for Read-only files.
> But it turns out that the performance gain is relatively small
> for big files(lots of page fault) and most of the time the spool
> is on remote machine access across NFS.

On my server (which is now a bit short of RAM for its 5000 users)
I noticed considerable loss of performance and had to manually disable
mmapping. All pop3d daemons spent most of their time in
noninterruptible sleep on msync(), which is called from
mailbox_is_updated(). The latter is called before processing each
command, so the effect was terrible. That makes me think about
a special option to configure, say --disable-mmap.


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