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Needs some info about netcup rootservers
Hello
Recently i was researching about the netcup rootservers which seems to be pretty good deal but i noticed few things.
I have a dedicated server from hetzner that has a cpu Intel i7-4770 and the single core benchmark on geekbench v4 64 bit is around 4700~, but the single core on netcup rootserver is around 3500~ (Intel gold 6140) cpu which normally should be very similar to the 4770. So my question is why they still limit the cpu power while they advertise that the cores are dedicated. Can anyone give some more info?
Comments
Usually when a vps provider limits any resource it is because of the fact that it's still a shared environment and not a bare metal machine dedicated to one customer. That being said I didn't experience any performance issues due to any of their limits.
Overheads?
A "dedicated core" on a KVM VPS isn't necessarily directly comparable to a (dedicated) physical core on a dedicated server.
This said, netcup's Root-Servers are good for many purposes.
what makes you think so?
https://www.cpubenchmark.net/compare/Intel-i7-4770-vs-Intel-Xeon-Gold-6140/1907vs3132
it heavily depends on the type of Gold cpu and especially the 6140 has a by far lower core speed which most likely will be the cause for the single thread performance you see
https://browser.geekbench.com/v4/cpu/search?q=gold+6140
just check a few others, DO looks pretty much the same f.i.
I think you might see >4.5k with the gold only on dedicated machines where it can properly boost to the full turbo. BUT that simply does not happen on virtualized environments because it rather needs to utilize all threads instead of boosting.
so most likely no artifical limitation but the way moar threads vs. turbo capability is intended to work.
and in the end it's kind of what you asked for by having them dedicate (pin) threads for you - no turbo.
xeon gold 6140 = 2.30 ghz
i7-4770 = 3.9 ghz
(3.9/2.3)*3500 = 5932
The Xeon actually did pretty good if the i7 only got 4700.
And just to add, for many use cases, the missing CPU flags on the Netcup RS/VPS lineup will affect performance (AVX and some related flags are missing).
Also, there is some variance in the performance of the Root servers (much less than the VPS lineup) but it is still a far cry from having the dedicated setup and who knows what kind of neighbours you end up having.
@Falzo has already highlighted the Turbo differences (which are again not consistent depending on the node workload) as well which does make a big difference clock speed wise in case your workload is pure frequency sensitive as well.
comparing the base frequency of the gold with the turbo of 4770 isn't completely fair, just saying ;-)
Actually, on the RS they do passthrough AVX flags afaik.
Right - they pass through more flags on the RS vs the VPS but I'm not clear on what exactly they pass through (other than that they definitely dont pass through vmx as it's a ridiculously high paid add on per core).
I guess there are multiple reasons, like .e.g. "housekeeping" overhead and probably most importantly the fact that a dedicated core usually actually still is a vCore (read: a hw thread) and the fact that a system running a lot of diverse software (as opposed to a dedi with a largely consistent set of processes) has the caches trashed all the time.
That said, no matter the sales slogans (e.g. "like a small dedi"), a dedi cores VPS still is a VPS and not kind of a small dedi. Also btw. the customers first priority is usually not speed but rather consistency of performance.
I happen to have a netcup root VPS ("dedi core") and I published some numbers here and the flags, too. Here is what I found:
And that is a very nice set of flags for a VPS.