[Tfug] Linux kernel tcp delay options 4e7uzube

[Nick Lopez]

How are you doing the transfer, with Kmail? If your connecting over IMAP to cyrus your probably loosing some time in the round trips of post a message, fsync, send confirmation loops, i wouldn't think it'd be that bad though. If you stuck with Maildir and dovecot you could just scp over a tarball with no per-message penalties. Or do the same with cyrus and and use one of the Maildir to Cyrus conversion scripts on the server.

Also, the dovecot indexes make opening big Maildirs nearly instantaneous over IMAP. Cyrus does something similar I think

Adrian <choprboy at dakotacom.net> wrote:

>On Friday 07 June 2013 13:27, Nick Lopez wrote:
>> On Jun 6, 2013, at 5:40 PM, Adrian <choprboy at dakotacom.net> wrote:
>> > UWmail and dovecot both use mbox for mailstores, which is pretty
>> > much useless for my mailstore.
>>
>>   Um, Dovecot supports multiple backends, but the default/suggested one is
>> the indexed Maildir. As long as you don't change the Maildir outside of
>> Dovecot (IMAP, deliver, etc) the indexes won't have to be rebuilt
>> constantly and can do their job. It copes just fine with Harry's email
>> hoarding. (29G, 1.7M messages) as well as my own more modest 1.4G/79K
>> Maildir.
>
>
>My local laptop mailstore is ~1.1G/150k. opening a folder on mdir with 20k+ 
>messages starts to slow down considerably, about 24sec on a 101k message 
>folder just to read and process the index in Kmail. Trying to upload off my 
>laptop mailstore to Cyrus, I'm only getting 15-20msg/sec transfer rate with 
>minimal CPU and bandwidth usage on both sides, no I/O waits evident on the 
>server, seems to be purely some sort of TCP delay (~3ms away from the 
>server).
>
>
>Adrian
>
>
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