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

[Ed W]

On 25/10/2011 11:14, Linda Walsh wrote:
>
>
> I'm trying to find out what's causing this slowdown -- it's
> INTOLERABLE....
>
> over 1 minute and less than 1% done. (400MB file)...
>
> After trying 3 times, I gave up and logged in using X to the server
> and ran Tbird from there....
>
> Mail sent out in < 1 minute, though the copy to dovecot took about 50%
> longer.
>
> So...
>
> I looked at the network trace.
>
> 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.
>

Although larger packets might be helpful, I don't see that you shouldn't
be getting much faster speed without it?  Even the 64K window, whilst it
looks too small, might be ok if your ping times are very low?

Something else is limiting your performance I think?

Ed W