[Dovecot] Indexing Performance Question (was tpop3d vs dovecot)

Timo Sirainen tss at iki.fi
Fri Feb 2 12:14:47 UTC 2007

On Fri, 2007-02-02 at 12:42 +0100, Jan Srzednicki wrote:
> On Fri, Feb 02, 2007 at 12:24:42AM +0200, Timo Sirainen wrote:
> > On 1.2.2007, at 3.39, Nate wrote:
> > 
> > The reason why the messages are read in the first place is because  
> > the message sizes need to be returned so that linefeeds are counted  
> > in CR+LF format, while they're typically stored in LF-only format. So  
> > if Dovecot just stat()ed the file and returned that as the message's  
> > size, it would be violating the POP3 spec. tpop3d seems to be doing  
> > that.
> Wouldn't it make sense to add the line count field to the index file?
> That would solve the CR+LF issue.

Cache file already contains the message's virtual size (linefeeds as
CRLF), so after once counting the virtual size it shouldn't open the
maildir file again unless there's a bug (as in this case there was).

> And I have another idea, which some time ago saved my butt with Courier:
> add a line count L=?? maildir flag, which would make messages look like:
> -rw-------    1 root     root         4811 Feb  9  2006 1138386088.22293_0.mail1,S=4811,L=104

Dovecot supports reading the virtual size from ,W=1234 in the filename.
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