CPU for Dovecot

[Håkon Alstadheim]

Den 25. nov. 2016 14:29, skrev Miloslav Hůla:
> Hi,
>
> we are planning to change hardware for our standalone Dovecot instance
> handling ~5800 IMAP users with 1TB mailboxes on local RAID. Is there
> some recommendation about CPU?
>
> We can choose from:
>  - Intel Xeon E5-2620v4 - 2,1GHz at 8,0GT 20MB cache, 8core, HT, 85W,
> LGA2011
>  - Intel Xeon E5-2623v4 - 2,6GHz at 8,0GT 10MB cache, 4core, HT, 85W,
> LGA2011
>
> The difference is about more cores vs. hi frequency.
As far as I can see, high frequency costs more than more cores, so the
2623 is more geared towards interactive use, or single-threaded servers
(like a single java thread). 50% reduction in number of cores gets you
only a few percent increase in frequency. Go with 2620 for mail server.