[Mailman-Developers] Re: To VERP or not to VERP?
J C Lawrence
Sun, 17 Jun 2001 13:23:48 -0700
On Sun, 17 Jun 2001 09:53:28 -0700
Chuq Von Rospach <email@example.com> wrote:
> 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.
Not surprised. Among other things its going to be sensitive to
number of spindles, RAID type, and feed characteristics.
>> 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.
I've noticed that E-Machines are getting popular for precisely that
J C Lawrence firstname.lastname@example.org
The pressure to survive and rhetoric may make strange bedfellows