--- On Thu, 4/8/10, Kent Peacock <[email protected]> wrote:
> On 04/08/10 17:27, marty scholes
> wrote:
> > On a hunch, I disabled all encryption and
> > authentication on the theory that these would add overhead
> > to the DTUs and cause them to be overwhelmed.
>
> This doesn't make a lot of sense. The Sun Ray 2s are
> powerful enough that you should notice no difference in
> performance with encryption on or off. The ARCFOUR
> encryption can be done at about 45 Mbps on a SR2. On the
> SR1, it's about 20 Mbps.
Thanks for the quick feedback and taking the time to respond.
I agree, it doesn't make a LOT of sense, but it does make some sense.
If my SR1 can decrypt 20Mb/s then it will struggle with a 50Mb/s
operation, which I see quite frequently when it is not decrypting.
> So, if you have LAN-connected SR1s,
> you'll notice a slight slowness with encryption on.
I have been saying since the release of 4.2 that I see a massive,
colossal, huge, monstrous, astronomical, etc. slowdown when it switches
into low-bandwidth mode because it tricked itself into believing that
it has a low speed link, but it actually has a straight unconstrained
100Mb/s full duplex shot into a 1Gb/s (recently a 2Gb/s LACP) link
to an otherwise idle server.
Several well-intentioned people in this group have gone to great strides
to convince me I am seeing issues with network or CPU or memory
or firmware versions or phase-of-the-moon or relative humidity or
I am hallucinating or have angered the DTU gods or whatever.
Check the archives on this thread. It was happening, plain and simple.
Without hubris, fortunately for Oracle, this happened to a non-paying
customer who was providing real-world feedback to be corrected before
it scared a large enterprise customer then putting a large sale at risk.
> None of this should be release dependent.
I was reminded of that as well -- many times. Experience contradicts.
> What servers are you using?
Everything is on a four socket Opteron v40z with 2.4GHz CPUs, 16GB RAM.
Thanks again for taking the time. I will say this again, "This
phenomenon is happening, whether or not it is being reported, whether
or not it is to believed by those inside Sun. It has or will contribute
to lost large sales of enterprise gear because it gives a bad impression
of a simple thing: thin terminals."
If I were evaluating a datacenter upgrade of servers and databases and
my first impression of the "New Oracle" was this experience I had, I
would quickly report to the CIO that if the Sun Ray technology was any
indication of what to expect from the rest of the proposed purchase, then
everyone should start filling out their resumes now, or buy from IBM.
Thanks again.
Cheers,
Marty
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