I've noticed this before and wasn't sure of the problem -- sending large files from FF. I tracked it down, and the problem is in dovecot when it is saving the mail to my 'Record' (Outbox)... It's saving the file in tiny chunks.... Looking at a few, I see: 4148 bytes 2116 bytes 1604 bytes 692 bytes The latency is killing it. I see the TCP window size being as high as 17069 with 7678 being common. The sendmail latency isn't spectacular, but at least uses ~64K packets. So wazzup with dovecot? I don't recall this being so much an issue with the old uwash imaps, but then it's been a while since I've used it and maybe my files weren't as large. But it can take several minutes to save a file to a record file that takes <1 second over network CIFS. Anyway to up the size of minimum packet size to 128K or more? Ideal packet size on my network is about 16MB under CIFS...with benefits seen even using 256MB packet sizes.... Is there a place to tune this that I don't know about? Thanks....
On 10.5.2011, at 22.45, Linda Walsh wrote:> I've noticed this before and wasn't sure of the problem -- sending large files from FF.What is FF?> I tracked it down, and the problem is in dovecot when it is saving the mail to my 'Record' (Outbox)...So when IMAP client is sending a message to Dovecot?> It's saving the file in tiny chunks.... > > Looking at a few, I see: > 4148 bytes > 2116 bytes > 1604 bytes > 692 bytesIsn't that the client that is sending it in small pieces then? How did you measure those bytes?> The latency is killing it. I see the TCP window size being as high as 17069 with 7678 being common. > The sendmail latency isn't spectacular, but at least uses ~64K packets. So wazzup with dovecot?Whatever it is, it's not a common problem.