- Stan Hoeppner stan@hardwarefreak.com:
Hmm. My Lenny systems have 4.3.2-2. Are you maybe using Squeeze, not Lenny?
Yes, squeeze, sorry
I'm still using i686 systems, but I wouldn't think that would change the version of GCC that gets installed. I'm not sure if this may be playing a role in this problem or not. What kernel version are you running, stock Debian or rolled from source?
2.6.32-23-generic-pae, from Ubuntu
I'm trying to help you identify what is different on your system from other OPs that is causing 2.x to perform so badly vs 1.x. If sys is high but usr and iowait aren't, then I would think the problem is in a system library, your kernel, dovecot, or more specifically, the interaction among all three.
You're using maildir correct? What filesystem are you using?
Maildir on ext4
Are you doing anything in your Dovecot config, both 1.x and 2.x, that is "unique" or non-standards maybe, compared to other OPs?
It's all users from /etc/passwd, but nothing special.
Is this a virtual machine guest or bare metal host?
virtual machine guest
What do memory and swap usage look like?
Memory usage is identical with 2.0 and 1.2: total: 8GB free: 5457MB cached: 1054MB
The machine has no swap.
What do you see for %CPU when you watch your kernel threads in top? Is one of then eating lots of CPU time? If so, which one?
Uhm, for that I'd have to switch back and look at kernel threads explicitly.
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