The Intel Xeon D Review: Performance Per Watt Server SoC Champion?by Johan De Gelas on June 23, 2015 8:35 AM EST
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The days that Intel neglected the low end of the server market are over. The most affordable Xeon used to be the Xeon E3: a desktop CPU with a few server features enabled and with a lot of potential limitations unless you could afford the E5 Xeons. The gap, both in performance and price, between Xeon E3 and E5 is huge. For example - a Xeon E5 can address up to 768 GB and the Xeon E3 up to 32 GB. A Xeon E5 server could contain up to 36 cores, whereas Xeon E3 was limited to a paltry four. And the list is long: most RAS features, virtualization features were missing from the E3, along with a much smaller L3-cache. On those terms, the Xeon E3 simply did not feel very "pro".
Luckily, the customers in the ever expanding hyperscale market (Facebook, Amazon, Google, Rackspace and so on) need Xeons at a very large scale and have been demanding a better chip than the Xeon E3. Just a few months ago, the wait was over: Xeon D fills the gap between the Xeon E3 and the Xeon E5. Combining the most advanced 14 nm Broadwell cores, a dual 10 gigabit interface, a PCIe 3.0 root with 24 lanes, USB and SATA controllers in one integrated SoC, the Xeon D has excellent specs on paper for everyone who does not need the core count of the Xeon E5 servers, but who simply needs 'more' than the Xeon E3.
Many news editors could not resist calling the Xeon D a response to the ARM server threat. After all, ARM has repeated more than once that the ambition is to be competitive in the scale-out server market. The term "micro server" is hard to find on the power point slides these days; the "scale-out" market is a lot cooler, larger and more profitable. But the comments of the Facebook engineers can quickly brings us back to reality:
"Introducing "Yosemite": the first open source modular chassis for high-powered microservers"
"We started experimenting with SoCs about two years ago. At that time, the SoC products on the market were mostly lightweight, focusing on small cores and low power. Most of them were less than 30W. Our first approach was to pack up to 36 SoCs into a 2U enclosure, which could become up to 540 SoCs per rack. But that solution didn't work well because the single-thread performance was too low, resulting in higher latency for our web platform. Based on that experiment, we set our sights on higher-power processors while maintaining the modular SoC approach."
It is pretty simple: the whole "low power simple core" philosophy did not work very well in the real scale out (or "high powered micro server") market. And the reality is that the current SoCs with an ARM ISA do not deliver the necessary per core performance: they are still micro server SoCs, at best competing with the Atom C2750. So currently, there is no ARM SoC competition in the scale out market until something better hits the market for these big players.
Two questions remain: how much better is the 2 GHz Xeon D compared to the >3GHz Xeon E3? And is it an interesting alternative to those that do not need the high end Xeon E5?
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Flunk - Tuesday, June 23, 2015 - linkYes, but it's still bad marketing. -D is associated with inferior, overly hot, bad performing Intel chips.
IanHagen - Tuesday, June 23, 2015 - linkCertainly. From a marketing standpoint it's a pretty poor choice. I agree with wussupi, E4 would haven been a far better name.
karpodiem - Tuesday, June 23, 2015 - linkdoes anyone know where to buy these online? I'm looking for just the board/processor, model # 'X10SDV-TLN4F'
All these random/small Supermicro resellers are selling it now, based on some Google searches. They're marking it up in price by at least a hundred bucks, because availability is limited. Anyone know when Newegg might get it in stock?
Looking to do a FreeNAS build - this board + IBM M1015 card in an ATX motherboard (6x4TB drives in RAIDZ2).
ats - Tuesday, June 23, 2015 - linkThe TLN4F is the one in most demand and almost no place is able to keep it in stock. There are multiple places that will order it for you for ~1K but wait times can be anywhere from 1 week to 1 month.
Jon Tseng - Tuesday, June 23, 2015 - link> And the reality is that the current SoCs with an ARM ISA do not deliver the necessary per core
> performance: they are still micro server SoCs, at best competing with the Atom C2750. So
> currently, there is no ARM SoC competition in the scale out market until something better than
> the A57 hits the market for these big players.
Dude... You really want to have a look at the latest ThunderX parts or the X-Gene 16nm shrinks before you start making unwise statements like that. These aren't waiting around for A57 they are custom ARM architecture designs. Per core performance might not be as hot as Xeon but once you start to throw 48 cores on a die I wouldn't quite call that "at best competing with Avaton".
smoohta - Tuesday, June 23, 2015 - linkLink to reviews?
ats - Tuesday, June 23, 2015 - linkX-Gene is in the article, any further shrinks are still entirely vapor. ThunderX isn't currently available is is likely to have significantly worse per core performance than Atom C2k series and worse than A57. All the cores in the world don't do jack if the ST isn't there. And ST performance IS a barrier even in scale out. For general scale out, C2750 was found fairly wanting because of the ST performance, and neither X-Gene nor ThunderX even compete with C2750 in ST performance... QED.
mczak - Tuesday, June 23, 2015 - linkHe said "currently". The X-Gene 16nm cores might offer some competition who knows - but those are X-Gene 3 whereas you can't even buy anything with X-Gene 2 28nm ones right now... Likewise, ThunderX servers have been announced, but I haven't seen any reviews yet.
name99 - Tuesday, June 23, 2015 - linkLook at the ThunderX parts HOW? Cavium releases fsck-all information about them. No-one knows if they are even OoO, how wide they are, etc.
Yes, there are 48 cores on a SoC; and presumably they will do well for tasks like memcached that like lots of low-performance parallelism. But right now, we have ZERO evidence that a ThunderX part is a better single-threaded core than A57, let alone that it's comparable to Broadwell.
der - Tuesday, June 23, 2015 - linkNOICE FAM!