`<div dir="ltr">Some other things you need to take into account:<div><br></div><div>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. </div><div><br></div><div>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. </div><div><br></div><div>If you are getting 185MB/s, you are seeing 1.48Gbps. </div><div><br></div><div>Keep your B's and b's straight. Did you play with your frame size at all?</div><div><br></div><div>Ian</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 14, 2017 at 7:10 AM, Jim Klimov <span dir="ltr"><<a href="mailto:jimklimov@cos.ru" target="_blank">jimklimov@cos.ru</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On September 14, 2017 2:26:13 PM GMT+02:00, Dirk Willems <<a href="mailto:dirk.willems@exitas.be">dirk.willems@exitas.be</a>> wrote:<br>
>Hello,<br>
><br>
><br>
>I'm trying to understand something let me explain.<br>
><br>
><br>
>Oracle always told to me that if you create a etherstub switch it has<br>
>infiniband speed 40GB/s.<br>
><br>
>But I have a customer running on Solaris (Yeah I know but let me<br>
>explain) who is copy from 1 NGZ to another NGZ on the same GZ over Lan<br>
>(I know told him to to use etherstub).<br>
><br>
>The copy witch is performed for a Oracle database with sql command, the<br>
><br>
>DBA witch have 5 streams say it's waiting on the disk, the disk are 50<br>
>-<br>
>60 % busy the speed is 30 mb/s.<br>
><br>
><br>
>So I did some test just to see and understand if it's the database or<br>
>the system, but with doing my tests I get very confused ???<br>
><br>
><br>
>On another Solaris at my work copy over etherstub switch => copy speed<br>
>is 185MB/s expected much more of infiniband speed ???<br>
><br>
><br>
>root@test1:/export/home/<wbr>Admin# scp test10G<br>
>Admin@192.168.1.2:/export/<wbr>home/Admin/<br>
>Password:<br>
>test10G 100%<br>
>|****************************<wbr>******************************<wbr>******|<br>
>10240<br>
>MB 00:59<br>
><br>
><br>
>root@test2:~# dlstat -i 2<br>
><br>
> LINK IPKTS RBYTES OPKTS OBYTES<br>
> net1 25.76K 185.14M 10.08K 2.62M<br>
> net1 27.04K 187.16M 11.23K 3.22M<br>
> net1 26.97K 186.37M 11.24K 3.23M<br>
> net1 26.63K 187.67M 10.82K 2.99M<br>
> net1 27.94K 186.65M 12.17K 3.75M<br>
> net1 27.45K 187.46M 11.70K 3.47M<br>
> net1 26.01K 181.95M 10.63K 2.99M<br>
> net1 27.95K 188.19M 12.14K 3.69M<br>
> net1 27.91K 188.36M 12.08K 3.64M<br>
><br>
>The disks are all separate luns with all separated pools => disk are 20<br>
><br>
>- 30% busy<br>
><br>
><br>
>On my OmniOSce at my lab over etherstub<br>
><br>
><br>
>root@GNUHealth:~# scp test10G witte@192.168.20.3:/export/<wbr>home/witte/<br>
>Password:<br>
>test10G 76% 7853MB 116.4MB/s<br>
><br>
><br>
>=> copy is 116.4 MB/s => expected much more from infiniband speed is<br>
>just the same as Lan ???<br>
><br>
><br>
>Is not that my disk can not follow 17% busy there sleeping ...<br>
><br>
> extended device statistics<br>
> r/s w/s Mr/s Mw/s wait actv wsvc_t asvc_t %w %b device<br>
> 0,0 248,4 0,0 2,1 0,0 1,3 0,0 5,3 0 102 c1<br>
> 0,0 37,5 0,0 0,7 0,0 0,2 0,0 4,7 0 17 c1t0d0 =><br>
>rpool<br>
> 0,0 38,5 0,0 0,7 0,0 0,2 0,0 4,9 0 17 c1t1d0 =><br>
>rpool<br>
> 0,0 40,5 0,0 0,1 0,0 0,2 0,0 5,6 0 17 c1t2d0 =><br>
>data pool<br>
> 0,0 43,5 0,0 0,2 0,0 0,2 0,0 5,4 0 17 c1t3d0 =><br>
>data pool<br>
> 0,0 44,5 0,0 0,2 0,0 0,2 0,0 5,5 0 18 c1t4d0 =><br>
>data pool<br>
> 0,0 44,0 0,0 0,2 0,0 0,2 0,0 5,4 0 17 c1t5d0 =><br>
>data pool<br>
> 0,0 76,0 0,0 1,5 7,4 0,4 97,2 4,9 14 18 rpool<br>
> 0,0 172,4 0,0 0,6 2,0 0,9 11,4 5,5 12 20 DATA<br>
><br>
><br>
><br>
>root@NGINX:/root# dlstat show-link NGINX1 -i 2<br>
><br>
> LINK TYPE ID INDEX PKTS BYTES<br>
> NGINX1 rx bcast -- 0 0<br>
> NGINX1 rx sw -- 0 0<br>
> NGINX1 tx bcast -- 0 0<br>
> NGINX1 tx sw -- 9.26K 692.00K<br>
> NGINX1 rx local -- 26.00K 216.32M<br>
> NGINX1 rx bcast -- 0 0<br>
> NGINX1 rx sw -- 0 0<br>
> NGINX1 tx bcast -- 0 0<br>
> NGINX1 tx sw -- 7.01K 531.38K<br>
> NGINX1 rx local -- 30.65K 253.73M<br>
> NGINX1 rx bcast -- 0 0<br>
> NGINX1 rx sw -- 0 0<br>
> NGINX1 tx bcast -- 0 0<br>
> NGINX1 tx sw -- 8.95K 669.32K<br>
> NGINX1 rx local -- 29.10K 241.15M<br>
><br>
><br>
>On the other NGZ I receive 250MB/s ????<br>
><br>
><br>
>- So my question is how comes that the speed is equal to Lan 100MB/s on<br>
><br>
>OmniOSce but i receive 250MB/s ?<br>
><br>
>- Why is etherstub so slow if infiniband speed is 40GB/s ???<br>
><br>
><br>
>I'm very confused right now ...<br>
><br>
><br>
>And want to know for sure how to understand and see this in the right<br>
>way, because this customer will be the first customer from my who gonna<br>
><br>
>switch complety over to OmniOSce on production and because this<br>
>customer<br>
>is one or the biggest company's in Belgium I really don't want to mess<br>
>up !!!<br>
><br>
><br>
>So any help and clarification will be highly appreciate !!!<br>
><br>
><br>
>Thank you very much.<br>
><br>
><br>
>Kind Regards,<br>
><br>
><br>
>Dirk<br>
<br>
</div></div>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 :)<br>
<br>
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.<br>
<br>
To estimate the speeds, try pure UDP streams from process to process (no disk), large-packet floodping, etc.<br>
<br>
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.<br>
<br>
Jim<br>
--<br>
Typos courtesy of K-9 Mail on my Android<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Ian Kaufman<br>Research Systems Administrator<br>UC San Diego, Jacobs School of Engineering ikaufman AT ucsd DOT edu <br></div>
</div>
`