[Dovecot] Poor pop3 over nfs performance

[Timo Sirainen]

On Wed, 2008-07-02 at 11:01 +0100, Mark Zealey wrote:
> Now what I discovered in testing a particularly problematic user with an
> 800mb cur directory (under v1.1.1; I have never used v1.0 on this mbox
> but it was converted with your courier convert script); initially they
> had the following:
> 
> drwx------ 2 exim exim   2048 Apr 11  2007 courierimapkeywords
> -rw-r--r-- 1 exim exim     47 Apr 22 15:56 courierimapsubscribed
> -rw-r--r-- 1 exim exim 142493 Jun 23 19:57 courierimapuiddb
> -rw-r--r-- 1 exim exim 195309 Jun 24 18:52 courierpop3dsizelist
> drwx------ 2 exim exim 499712 Jul  2 10:35 cur
> -rw------- 1 exim exim  20912 Jul  2 10:51 dovecot.index
> -rw------- 1 exim exim  33056 Jun 17 17:34 dovecot.index.cache
> -rw------- 1 exim exim  31336 Jul  2 10:37 dovecot.index.log
> -rw------- 1 exim exim 158465 Jul  2 10:13 dovecot-uidlist
> drwx------ 2 exim exim   4096 Jul  2 10:29 new
> -rw------- 1 exim exim     23 Jun 24 22:49 subscriptions
> drwx------ 2 exim exim   2048 Jul  2 10:42 tmp
> 
> As you can see, the cache file is very old, and the uidlist file is
> behind the last time that the logged in (which was 10:35). When I log in
> over pop and do a stat/list, it re-reads everything in cur/new but
> didn't update the dovecot-uidlist file or the index.cache file (the log
> file is updated though). Dovecot-uidlist file does not have the extra W=
> tags in it. I removed the dovecot.index.cache file and performed the
> same login/stat/list operation and logged out, and suddenly the
> dovecot-uidlist file was updated to the new v1.1 format, and the
> directory listing looks like:

I guess you didn't happen to save the original dovecot.index.cache file?
The problem probably is related to what fields were originally cached,
but I can't reproduce this.
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