[OmniOS-discuss] questions
Ian Kaufman
ikaufman at eng.ucsd.edu
Thu Sep 14 16:26:27 UTC 2017
Networking has always used *bps - that's been the standard for many years.
Megabits, Gigabits ...
Disk tools have always measured in bytes since that is how the capacity is
defined.
How did you create your etherstub? I know you can set a maxbw (maximum
bandiwdth), but I don't know what the default behavior is.
Ian
On Thu, Sep 14, 2017 at 9:13 AM, Dirk Willems <dirk.willems at exitas.be>
wrote:
> Thank you all, the water is already clearing up :)
>
>
> So infiniband is 40 Gbps an not 40GB/s, very confusing GB/s Gbps why they
> not take a standaard and set everything in GB/s or MB/s ?
>
> A lot of people make a lot of mistakes between them, me too ...
>
> If it is 40 Gbps a factor of 8 then we theoretical have max 5 GB/s
> throughput.
>
> Little difference 40 or 5 :)
>
> So Ian you have the full blow with 36Gbps very cool looks more like it :)
>
> Did I play with the frame size, not really sure what you mean by that
> sorry but I think its default on 9000
>
> Backend_Switch0 etherstub 9000 up
>
>
> Do understand that if we use UDP streams from process to process it will
> be much quicker over the etherstub gonna need more test to do.
>
> We used for a customer Mbuffer with zfs send over Lan that is also very
> quick sometimes I also use it at my home very good prog.
>
> But still do not understand how it is that I copy from 1 NGZ with 100MB/s,
> I receive on the other NGZ 250MB/s very strange ?
>
>
> the command dlstat difference between OmniOSce and Solaris ?
>
> RBYTES => receiving
>
> OBYTES => sending
>
> root at test2:~# dlstat -i 2
> >
> > LINK IPKTS RBYTES OPKTS OBYTES
> > net1 25.76K 185.14M 10.08K 2.62M
> > net1 27.04K 187.16M 11.23K 3.22M
>
>
>
> BYTES => receiving and sending ?
>
> But then still if the copy is not running I have 0 so doesn't explain why
> I see 216 MB where come the rest of the 116 MB from is it compression ?
>
> root at NGINX:/root# dlstat show-link NGINX1 -i 2
> >
> > LINK TYPE ID INDEX PKTS BYTES
> > NGINX1 rx bcast -- 0 0
> > NGINX1 rx sw -- 0 0
> > NGINX1 tx bcast -- 0 0
> > NGINX1 tx sw -- 9.26K 692.00K
> > NGINX1 rx local -- 26.00K 216.32M
>
>
> Thank you all for your feedback much appreciations !
>
>
> Kind Regards,
>
>
> Dirk
>
>
>
> On 14-09-17 17:07, Ian Kaufman wrote:
>
> Some other things you need to take into account:
>
> QDR Infiniband is 40Gbps, not 40GB/s. That is a factor of 8 difference.
> That is also a theoretical maximum throughput, there is some overhead. In
> reality, you will never see 40Gbps.
>
> My system tested out at 6Gbps - 8Gbps using NFS over IPoIB, with DDR
> (20Gbps) nodes and a QDR (40Gbps) storage server. IPoIB drops the
> theoretical max rates to 18Gbps and 36Gbps respectively.
>
> If you are getting 185MB/s, you are seeing 1.48Gbps.
>
> Keep your B's and b's straight. Did you play with your frame size at all?
>
> Ian
>
> On Thu, Sep 14, 2017 at 7:10 AM, Jim Klimov <jimklimov at cos.ru> wrote:
>
>> On September 14, 2017 2:26:13 PM GMT+02:00, Dirk Willems <
>> dirk.willems at exitas.be> wrote:
>> >Hello,
>> >
>> >
>> >I'm trying to understand something let me explain.
>> >
>> >
>> >Oracle always told to me that if you create a etherstub switch it has
>> >infiniband speed 40GB/s.
>> >
>> >But I have a customer running on Solaris (Yeah I know but let me
>> >explain) who is copy from 1 NGZ to another NGZ on the same GZ over Lan
>> >(I know told him to to use etherstub).
>> >
>> >The copy witch is performed for a Oracle database with sql command, the
>> >
>> >DBA witch have 5 streams say it's waiting on the disk, the disk are 50
>> >-
>> >60 % busy the speed is 30 mb/s.
>> >
>> >
>> >So I did some test just to see and understand if it's the database or
>> >the system, but with doing my tests I get very confused ???
>> >
>> >
>> >On another Solaris at my work copy over etherstub switch => copy speed
>> >is 185MB/s expected much more of infiniband speed ???
>> >
>> >
>> >root at test1:/export/home/Admin# scp test10G
>> >Admin at 192.168.1.2:/export/home/Admin/
>> >Password:
>> >test10G 100%
>> >|****************************************************************|
>> >10240
>> >MB 00:59
>> >
>> >
>> >root at test2:~# dlstat -i 2
>> >
>> > LINK IPKTS RBYTES OPKTS OBYTES
>> > net1 25.76K 185.14M 10.08K 2.62M
>> > net1 27.04K 187.16M 11.23K 3.22M
>> > net1 26.97K 186.37M 11.24K 3.23M
>> > net1 26.63K 187.67M 10.82K 2.99M
>> > net1 27.94K 186.65M 12.17K 3.75M
>> > net1 27.45K 187.46M 11.70K 3.47M
>> > net1 26.01K 181.95M 10.63K 2.99M
>> > net1 27.95K 188.19M 12.14K 3.69M
>> > net1 27.91K 188.36M 12.08K 3.64M
>> >
>> >The disks are all separate luns with all separated pools => disk are 20
>> >
>> >- 30% busy
>> >
>> >
>> >On my OmniOSce at my lab over etherstub
>> >
>> >
>> >root at GNUHealth:~# scp test10G witte at 192.168.20.3:/export/home/witte/
>> >Password:
>> >test10G 76% 7853MB 116.4MB/s
>> >
>> >
>> >=> copy is 116.4 MB/s => expected much more from infiniband speed is
>> >just the same as Lan ???
>> >
>> >
>> >Is not that my disk can not follow 17% busy there sleeping ...
>> >
>> > extended device statistics
>> > r/s w/s Mr/s Mw/s wait actv wsvc_t asvc_t %w %b device
>> > 0,0 248,4 0,0 2,1 0,0 1,3 0,0 5,3 0 102 c1
>> > 0,0 37,5 0,0 0,7 0,0 0,2 0,0 4,7 0 17 c1t0d0 =>
>> >rpool
>> > 0,0 38,5 0,0 0,7 0,0 0,2 0,0 4,9 0 17 c1t1d0 =>
>> >rpool
>> > 0,0 40,5 0,0 0,1 0,0 0,2 0,0 5,6 0 17 c1t2d0 =>
>> >data pool
>> > 0,0 43,5 0,0 0,2 0,0 0,2 0,0 5,4 0 17 c1t3d0 =>
>> >data pool
>> > 0,0 44,5 0,0 0,2 0,0 0,2 0,0 5,5 0 18 c1t4d0 =>
>> >data pool
>> > 0,0 44,0 0,0 0,2 0,0 0,2 0,0 5,4 0 17 c1t5d0 =>
>> >data pool
>> > 0,0 76,0 0,0 1,5 7,4 0,4 97,2 4,9 14 18 rpool
>> > 0,0 172,4 0,0 0,6 2,0 0,9 11,4 5,5 12 20 DATA
>> >
>> >
>> >
>> >root at NGINX:/root# dlstat show-link NGINX1 -i 2
>> >
>> > LINK TYPE ID INDEX PKTS BYTES
>> > NGINX1 rx bcast -- 0 0
>> > NGINX1 rx sw -- 0 0
>> > NGINX1 tx bcast -- 0 0
>> > NGINX1 tx sw -- 9.26K 692.00K
>> > NGINX1 rx local -- 26.00K 216.32M
>> > NGINX1 rx bcast -- 0 0
>> > NGINX1 rx sw -- 0 0
>> > NGINX1 tx bcast -- 0 0
>> > NGINX1 tx sw -- 7.01K 531.38K
>> > NGINX1 rx local -- 30.65K 253.73M
>> > NGINX1 rx bcast -- 0 0
>> > NGINX1 rx sw -- 0 0
>> > NGINX1 tx bcast -- 0 0
>> > NGINX1 tx sw -- 8.95K 669.32K
>> > NGINX1 rx local -- 29.10K 241.15M
>> >
>> >
>> >On the other NGZ I receive 250MB/s ????
>> >
>> >
>> >- So my question is how comes that the speed is equal to Lan 100MB/s on
>> >
>> >OmniOSce but i receive 250MB/s ?
>> >
>> >- Why is etherstub so slow if infiniband speed is 40GB/s ???
>> >
>> >
>> >I'm very confused right now ...
>> >
>> >
>> >And want to know for sure how to understand and see this in the right
>> >way, because this customer will be the first customer from my who gonna
>> >
>> >switch complety over to OmniOSce on production and because this
>> >customer
>> >is one or the biggest company's in Belgium I really don't want to mess
>> >up !!!
>> >
>> >
>> >So any help and clarification will be highly appreciate !!!
>> >
>> >
>> >Thank you very much.
>> >
>> >
>> >Kind Regards,
>> >
>> >
>> >Dirk
>>
>> I am not sure where the infiniband claim comes from, but copying data
>> disk to disk, you involve the slow layers like disk, skewed by faster
>> layers like cache of already-read data and delayed writes :)
>>
>> If you have a wide pipe that you may fill, it doesn't mean you do have
>> the means to fill it with a few disks.
>>
>> To estimate the speeds, try pure UDP streams from process to process (no
>> disk), large-packet floodping, etc.
>>
>> I believe etherstub is not constrained artificially, and defaults to
>> jumbo frames. Going to LAN and back can in fact use external hardware (IIRC
>> there may be a system option to disable that, not sure) and so is
>> constrained by that.
>>
>> Jim
>> --
>> Typos courtesy of K-9 Mail on my Android
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>> http://lists.omniti.com/mailman/listinfo/omnios-discuss
>>
>
>
>
> --
> Ian Kaufman
> Research Systems Administrator
> UC San Diego, Jacobs School of Engineering ikaufman AT ucsd DOT edu
>
>
> _______________________________________________
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>
>
> --
> Dirk Willems
> System Engineer
>
>
> +32 (0)3 443 12 38 <+32%203%20443%2012%2038>
> Dirk.Willems at exitas.be
>
> Quality. Passion. Personality
>
> www.exitas.be | Veldkant 31 | 2550 Kontich
>
> Illumos OmniOS Installation and Configuration Implementation Specialist.
> Oracle Solaris 11 Installation and Configuration Certified Implementation
> Specialist.
>
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>
--
Ian Kaufman
Research Systems Administrator
UC San Diego, Jacobs School of Engineering ikaufman AT ucsd DOT edu
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