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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Rupert,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks for replying. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Below is the output of the ibdiagnet command.<o:p></o:p></p><p class=MsoNormal>I don’t see any issues here. Just tell me if you need more info.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I forgot to mention that we are using the following switch version:<o:p></o:p></p><p class=MsoNormal>edgeprod1# version show<o:p></o:p></p><p class=MsoNormal> version: 3.6.0<o:p></o:p></p><p class=MsoNormal> date: Jun 07 2011 11:19:33 AM<o:p></o:p></p><p class=MsoNormal> build Id:857<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>And the default SLES 11 SP1 ofed build: ofed-1.4.2-0.9.6<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>15:00:28|root@gpfsprod1n1:~ 0 # ibdiagnet<o:p></o:p></p><p class=MsoNormal>Loading IBDIAGNET from: /usr/lib64/ibdiagnet1.2<o:p></o:p></p><p class=MsoNormal>-W- Topology file is not specified.<o:p></o:p></p><p class=MsoNormal> Reports regarding cluster links will use direct routes.<o:p></o:p></p><p class=MsoNormal>Loading IBDM from: /usr/lib64/ibdm1.2<o:p></o:p></p><p class=MsoNormal>-W- A few ports of local device are up.<o:p></o:p></p><p class=MsoNormal> Since port-num was not specified (-p option), port 1 of device 1 will be<o:p></o:p></p><p class=MsoNormal> used as the local port.<o:p></o:p></p><p class=MsoNormal>-I- Discovering ... 39 nodes (6 Switches & 33 CA-s) discovered.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Bad Guids/LIDs Info<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- No bad Guids were found<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Links With Logical State = INIT<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- No bad Links (with logical state = INIT) were found<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- PM Counters Info<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- No illegal PM counters values were found<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Fabric Partitions Report (see ibdiagnet.pkey for a full hosts list)<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- PKey:0x7fff Hosts:65 full:65 partial:0<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- IPoIB Subnets Check<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Subnet: IPv4 PKey:0x7fff QKey:0x00000b1b MTU:2048Byte rate:10Gbps SL:0x00<o:p></o:p></p><p class=MsoNormal>-W- Suboptimal rate for group. Lowest member rate:40Gbps > group-rate:10Gbps<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Bad Links Info<o:p></o:p></p><p class=MsoNormal>-I- No bad link were found<o:p></o:p></p><p class=MsoNormal>-I---------------------------------------------------<o:p></o:p></p><p class=MsoNormal>----------------------------------------------------------------<o:p></o:p></p><p class=MsoNormal>-I- Stages Status Report:<o:p></o:p></p><p class=MsoNormal> STAGE Errors Warnings<o:p></o:p></p><p class=MsoNormal> Bad GUIDs/LIDs Check 0 0<o:p></o:p></p><p class=MsoNormal> Link State Active Check 0 0<o:p></o:p></p><p class=MsoNormal> Performance Counters Report 0 0<o:p></o:p></p><p class=MsoNormal> Partitions Check 0 0<o:p></o:p></p><p class=MsoNormal> IPoIB Subnets Check 0 1<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please see /tmp/ibdiagnet.log for complete log<o:p></o:p></p><p class=MsoNormal>----------------------------------------------------------------<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-I- Done. Run time was 5 seconds.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>This type of info is given in ibdiagnet.lst:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>{ SW Ports:24 SystemGUID:0008f10500108fa9 NodeGUID:0008f10500108fa8 PortGUID:0008f10500108fa8 VenID:000008F1 DevID:5A5A0000 Rev:000000A1 {Voltaire<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> 4036 # edgeprod3} LID:0001 PN:05 } { CA Ports:02 SystemGUID:0002c903004ab175 NodeGUID:0002c903004ab172 PortGUID:0002c903004ab173 VenID:000002C9 D<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>evID:673C0000 Rev:000000B0 { HCA-1} LID:001A PN:01 } PHY=4x LOG=ACT SPD=10<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Koen Segers<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Enterprise Consultant<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#24387F'>Computacenter<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#009DDC'>Services & Solutions<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Ikaroslaan 31<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>B-1930 Zaventem<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Belgium<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Tel: +32 2 704 94 67<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Fax: +32 2 704 95 95<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Mob: +32 497 909353<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="mailto:koen_segers@computacenter.com" target="_blank"><span lang=EN-GB style='color:#24387F'>koen_segers@computacenter.com</span></a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.computacenter.com/benelux" target="_blank"><span style='color:#24387F'>www.computacenter.com/benelux</span></a><o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Rupert Dance <rsdance@soft-forge.com> [mailto:Rupert Dance <rsdance@soft-forge.com>] <br><b>Sent:</b> 17 October 2011 13:46<br><b>To:</b> <koen_segers@computacenter.com>; <ewg@lists.openfabrics.org><br><b>Subject:</b> RE: [ewg] 200m cable results in slower rdma read performance? [ CC Anti-Virus checked ]<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Have you run ibdiagnet to verify that your link width and speed is what you expect on all links?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Rupert Dance<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Software Forge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ewg-bounces@lists.openfabrics.org [mailto:ewg-bounces@lists.openfabrics.org] <b>On Behalf Of </b>koen_segers@computacenter.com<br><b>Sent:</b> Monday, October 17, 2011 3:22 AM<br><b>To:</b> ewg@lists.openfabrics.org<br><b>Subject:</b> [ewg] 200m cable results in slower rdma read performance? [ CC Anti-Virus checked ]<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal>Hi, <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In my test setup I have 3 servers of which 2 are residing in Datacenter1 and the other in Datacenter2.<o:p></o:p></p><p class=MsoNormal>If I do a rdma test between datacenters, I get a much lower performance than if I would do the test between servers residing in the same datacenter.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>DC1: gpfsprod1n1, gpfsprod1n3<o:p></o:p></p><p class=MsoNormal>DC2: gpfsprod1n2<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>08:54:48|root@gpfsprod1n1:~ 0 # qperf -t 5 cic-gpfsprod1n2 rc_rdma_write_bw<o:p></o:p></p><p class=MsoNormal>rc_rdma_write_bw:<o:p></o:p></p><p class=MsoNormal> bw = 1.9 GB/sec<o:p></o:p></p><p class=MsoNormal>08:54:59|root@gpfsprod1n1:~ 0 # qperf -t 5 cic-gpfsprod1n3 rc_rdma_write_bw<o:p></o:p></p><p class=MsoNormal>rc_rdma_write_bw:<o:p></o:p></p><p class=MsoNormal> bw = 3.39 GB/sec<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>The setup contains two pairs of edge switches (on each datacenter one pair) and two spine switches (each datacenter one), configured as a non blocking fat tree.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>So:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>The servers are connected to the edge switches.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>The spine switches are connected to all edge switches.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>These are the cables we are using:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol;color:black'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Length 5m Vendor Name: WLGORE Code: QSFP+ Vendor PN: 498385-B24 Vendor Rev: D Vendor SN xxxx<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol;color:black'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Length 200m Vendor Name: MOLEX Code: QSFP+ Vendor PN: 106410-1200 Vendor Rev: A Vendor SN xxxx<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Can someone tell me why this is so? And maybe how I can solve this?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Koen Segers<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Enterprise Consultant<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#24387F'>Computacenter<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#009DDC'>Services & Solutions<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Ikaroslaan 31<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>B-1930 Zaventem<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Belgium<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Tel: +32 2 704 94 67<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Fax: +32 2 704 95 95<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Mob: +32 497 909353<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="mailto:koen_segers@computacenter.com" target="_blank"><span lang=EN-GB style='color:#24387F'>koen_segers@computacenter.com</span></a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.computacenter.com/benelux" target="_blank"><span style='color:#24387F'>www.computacenter.com/benelux</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br><br><br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'>Visit us at <a href="http://www.computacenter.com/">http://www.computacenter.com/</a><br>Computacenter: Transforming IT service delivery.<br><br>========================== Disclaimer ==================================<br>The information in this email is confidential, and is intended solely for the addressee(s). 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