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Contabo VPS S NVMe: isn't this too slow?
I have a Contabo VPS S with the NVMe addon and I am benchmarking writing to the disk.
This is the speed I get:
dd if=/dev/urandom of=/dev/sda bs=4M conf=fsync status=progress
18975031296 bytes (19 GB, 18 GiB) copied, 469 s, 40.4 MB/s
It does not go higher than 40MB/s.
Isn't this too slow for the advertised NVMe?
Comments
for NVMe or ssd do a
./yabs.sh -i -g -r
and show us your penis numbers .
i got a 7.5
i didn't see that coming
hahahhahahahha
Probably CPU bottleneck, try a faster way of generating random data to test with
do you like it fast.
The 40 MB/s rw speed is usualy in 4K IOPS. That written uper, it seems to be a CPU limitation. If I understand you well, it is a new VPS. In my experience the newer VPSs has very poor performance. I bought a VPS M NVMe in BF. When I bought steal is 0.0, 512K IOPS and 1M IOPS near 20 GB/s in total. GB single core circa 800 and multi 4800. Next day the speeds average 5 GB/s, and CPU cores 600/2200. I reported the issue (poor performance), the ISP solved it for a short period, and it started again. I cancelled the service. The normal VPS packages has a good trade-of witht the friendly prices but the NVMe is a more expensive furthermore in practice unusable by the choppy speeds and CPU performance.
It is actually not a new one but I reinstalled it.
I thought /dev/urandom would not use much CPU...but here is YABS output:
can you please install
and run again the yabs
It's only too slow if it bottlenecks the actual use case. My raspberry pi setups fall every benchmarking standard for LET but they sure do wonderfully handle their jobs.
99% of users 40mb/s are fully enough. It is like a car - how often you drive your car at a full speed?
i like it fast
this looks really good actually
I got a fast, hard disk for you.
That's actually not bad for fsync'd writing. Also keep in mind that writing out 19 GB is likely to trash caching and in particular the NVMe on-board cache.
No. While creating fat pseudo random streams does indeed need some CPU performance (a) that's still orders of magnitude faster than any flash storage, and (b) we are talking about a system with 4 modern Zen vCores.
That said, Contabo's forte is not speed, neither CPU (Ryzens are way faster), nor disk (even a few abusers make it considerably slower for all), nor network (it's quite OK but not really fast). Contabo's forte is selling quite decent quite large VPS on modern hardware for a low price (for what you get).
Alright, thanks to everyone that was on topic!
i know you always deliver
/dev/urandom really is that slow on modern CPUs, try it yourself.
E.g. getting numbers like this on Zen and Skylake:
The conv=fsync is mostly irrelevant, it only syncs once on completion, not between each record
I did and you are partly right. On linux the command
dd if=/dev/urandom of=/dev/null bs=4M count=256 status=progressis indeed crap-slow, on a current FreeBSD though I get about 5 times higher performance!Also it seems that the whole thing is kind of weird because I get significantly better (ca. +25%) performance on an E5 v2 than on a Ryzen 39xxX.
Regarding fsync you are right though.
ddindeed only seems to do a sync once at the end rather than after each block as I assumed. That said, writing to /dev/zero fsync is kind of moot anyway.FWIW I also ran exactly the same dd command on my Contabo NVMe VPS and got 146 MB/s (on FreeBSD though) so @deer76's result seems plausible and in fact even good because on linux my result probably would be lower than his.
I should have used
oflag=syncinstead.What is the normal speed of SSD for contabo? After I applied to unlock the SSD speed, I got the following data, which doesn't feel very fast
fio Disk Speed Tests (Mixed R/W 50/50):
That's still too slow.
The speed should be similar to this one after the I/O limit is lifted.
@SuperValueHost @Leftup
I can confirm the values of SuperValueHosts. Test it on 6 machines, each on an other host, some in Düsseldorf, some in Nürnberg, different sizes (S, L, M, XL)
Only 1 Host has higher disk performance (4x times more at 4K, 2x at 64k, 512k & 1m the same values). That host, i remember, we had performance problems at the beginning and after Mail Contabo they do something (set higher limits??? don't know).
Be honest, Contabos SSD performance is not the best, for that you have RAM to cache files. You get what you pay for, but price / performance is still great.
I hope NVMe has the performance that other providers SSD have, soon i will order a further server with NVMe and can test it.
Here is a comparission with a Netcup RS 8000 SSD G7 SE 12M (~ 6 Years old) E5-2680 V4 @2.4 GHz
Indeed you need to open ticket (via email) to adjust the I/O limit. But some people says that the limit come back after some times. I never experienced it though.
For me 4 vCPU, 8GB RAM and 400GB SSD in Singapore for $10 USD is still a good deal.
I used it for development machine, so the performance requirements not that high.
Indeed it's a little slow.
In fact, I have open a ticket to adjust the IO speed limit, but I still feel very slow, so I just ask if such ssd speed is normal at contabo
I have used the singapore server from India. It can sure take a lot of loads but the speed is not great. Its under normal. The CPU must be shared too much as they are having a seperate dedicated virtual machines, at a 3x price!!.
At the end of the day we get what we paid for..thats it. I do not host a website that relies on a speed, Instead I used it for my inventory management that need a high loads but doesnt necessarily be fast.
Yes, I have dedis with 30MB/s I/O speed, it's more than usable, though, this is SCSI.