slow IMAP data transfer
dpc22 at cam.ac.uk
Thu Feb 9 05:46:29 EST 2006
On Thu, 9 Feb 2006, Juris Orlovs wrote:
> Before that I was setting up Cyrus IMAP mail servers on Linux and there
> was no such problems. Maybe it's OS issue? I also have set up such
> system on Celeron 800MHz, 256MB RAM and 80GB SEAGATE (FreeBSD 4.11), the
> results are aproximately the same. For SMTP i'm using Postfix, and it
> also shows bad results on data transfer.
Cyrus and Postfix both make very heavy use of fsync() to flush data to
disk before they confirm actions back to the sending system. RAID
controllers or disk boxes with battery backed writeback cache help lots.
David Carter Email: David.Carter at ucs.cam.ac.uk
University Computing Service, Phone: (01223) 334502
New Museums Site, Pembroke Street, Fax: (01223) 334679
Cambridge UK. CB2 3QH.
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