[Mailman-Developers] Re: To VERP or not to VERP?
Chuq Von Rospach
Sun, 17 Jun 2001 09:53:28 -0700
On Sunday, June 17, 2001, at 09:39 AM, J C Lawrence wrote:
> Exim for instance will defer
> deliveries if more than N messages are received in a single
> connection. As a result, you typically get no outbound deliveries
> going on during a qrunner broadcast.
IMHO, I consider that seriously broken.
> I've done similar experiments with news spools. The values are
> incredibly subjective to RAID stripe size. Bob Mende IIRC did some
> interesting work here which I think he presented at LISA.
> FWIW We ended up with a 1Meg strip size as the sweet spot, much
> bigger than we'd expected.
I know someone who did the same, and found the best perforamnce iwth (I
kid you not) 32 meg strip sizes.
> Silicon disks are another one. At Critical Path we used solid state
> disks for /var/spool and Qmail fairly, umm, whirred.
But what I've found, for really large e-mail installations, there's
always another bottleneck. The bigger/faster machine paradigm just
doesn't scale after a while, so what I'm working on now is a new setup
that I'm calling the "army of smurfs" design. I'm going to be buying
lots of small/fast/cheap boxes, and not going to try to try to keep
making that single monolithic machine do incrementally more.
Chuq Von Rospach, Internet Gnome <http://www.chuqui.com>
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