[Dovecot] Thunderbird slow in talking with dovecot IMAP AND to sendmail

[Linda Walsh]

Charles Marcus wrote:
> On 2011-10-25 6:14 AM, Linda Walsh <dovecot at tlinx.org> wrote:
>> and everyfrackin' body was using 4K packet sizes (at the application
>> level!, the window size on TCP was over 64K...but no one was using
>> it)....especially galling with my network's MTU at 9K, BTW, because
>> small packets are really bad on a 1Gb network.
>>
>> sendmail -- 4K,
>> dovecot /ssl, 4K...
>>
>> wazzup .. is t-bird forcing this,
>
> If I'm not mistaken, yes, this is (or could be) a TBird problem... I 
> can't find the bug report where this was discussed, but I distinctly 
> remember one of the devs commenting on this 4k packet size issue. 
> Apparently it was an intentional change, but he couldn't figure out why.
>
> Fyi, it was discussed in one of the IMAP performance bugs...
---
    Thanks for the lead...will check it out.

The problem with the Tbird (and FF) is that design for home users with 
dialup connections, so if you have a home network and run IMAP @home, 
all their tuning goes out the window -- and they don't make it configurable.

I had to go to a 9K packet size on 1Gb ethernet to get close to full 
bandwitch usage (and then it is a large
effort with a windows client)...and that's down at layer 2?  FF IMAP is 
at layer 5? ... the latency is insane at that point.

Alot of companies aren't real bright when it comes to storing files 
locally -- instead of 'local' they almost
always use the 'roaming' profile...Cuprits: TB at 4G, Adobe at 2.5G, XBMC 
~1-2G.  Adobe's great -- most of
that 2.5G are the product helpfiles which you don't get when you install 
-- they are d/led later and thus stored in your roaming profile.  Each 
user gets their own copy of the help material... 

Of course good thing they got rid of customer input for product design 
and got rid of 'usability studies'...
those things always caused problems.  Like MS removing the start bar in 
Win8 cause users don't want it?
Huh?  or Cocacola switching to 'newCoke, then having to revert due to 
outcry...because Coke drinkers
didn't want another pepsi knockoff.

Baka!