Slow local network performance for image attachments
aspineux at gmail.com
Fri Mar 28 23:19:00 EDT 2008
On Sat, Mar 29, 2008 at 2:09 AM, Jeff Larsen <jlar310 at gmail.com> wrote:
> I run cyrus imap in a virtual machine at home using fetchmail to pull
> my ISP mail into a local imap store. For the most part it works great.
> But with messages that have digital photo attachments it takes a
> seemingly inappropriate long time for Thunderbird to download the
> message (over local wired 100Mb network) and display the pictures.
> I've got plenty of memory overhead on both the virtual machine and the
> VMware Server host. While in the process of downloading an image
> email, the CPU usage goes higher than I would expect (20%) for a
> simple file transfer. It takes 10-15 seconds to load a message with 3
> images totaling 5MB over non-encrypted port 143. It's 2 or 3 times
> that long if I use imaps on 993.
> The VMware host is a 2GHz Pentium, with very little load from other processes.
First I thing about a probleme with Vmware or hardware (disk access or network)
Find the file that match your email in your imap spool, and try to
download/upload it using
scp on your workstation, and measure the time.
Also try using imap client on your server, and other imap client ....
> What's gong on here and can I do anything to fix it? Why so much CPU
> to transfer a 5MB message?. Doesn't Thunderbird handle the mime
> We use a similar setup at work (cyrus on virtual machine) for 50 users
> and I don't have the same problem there. Granted, the hardware is
> faster, but it's also carrying a much heavier load for other services.
> Cyrus Home Page: http://cyrusimap.web.cmu.edu/
> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
aspineux gmail com
May the sources be with you
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