# [OmniOS-discuss] questions

Dirk Willems dirk.willems at exitas.be
Thu Sep 14 16:13:30 UTC 2017

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    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
    > <mailto:jimklimov at cos.ru>> wrote:
    >
    >     On September 14, 2017 2:26:13 PM GMT+02:00, Dirk Willems
    >     <dirk.willems at exitas.be <mailto: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
    >     <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
    >
    >
    > _______________________________________________
    > OmniOS-discuss mailing list
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    --
    	Dirk Willems
    System Engineer

    +32 (0)3 443 12 38
    Dirk.Willems at exitas.be <mailto:Dirk.Willems at exitas.be>

    Quality. Passion. Personality

    www.exitas.be <http://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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