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Testing MCX455A bandwidth between Dell servers

I am testing MCX455A bandwidth between Dell servers using the commands:Server: Ib_write-bw –d mlx5_0  –i  1 –a –FandClient: Ib_write-bw –d mlx5_0  –i  1 –a –F  <server address>The results looks...

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ibv_post_send is slow in ping-pong

I tried to measure how much time it takes for each ibv_post_send (IB_WR_RDMA_WRITE) in the default rping program.I used clock_gettime to measure and the results show that every ibv_post_send function...

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Re: vSphere 6.0 PFC configuration for Ethernet iSER with Ethernet Driver...

HowTo Run RoCE over L2 Enabled with PFC (ESXi)

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Re: Mellanox eSwitchd issue on Openstack Kilo?

Hi MartijnSorry for being late, here is an eswitchd.log on the compute node.And I think mlnx-agent.log will be helpful so I add...

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Re: Qos options and Vlarb table

Hi all I think I understood in this topicIB QoS is really very different from the analogue to Ethernet.The IB uses two tables and the number of processed entires, which significantly increases the...

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QP Context size

I have read the document saying the ICM (Infinihost Context Memory) is required by the HCA to store Queue Pair (QP) context/Completion Queue (CQ) and Address Translation Table entries.I am wondering...

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Re: QP Context size

Hi, I believe this is what you're looking for in order to learn about QP context characteristics  : https://www.mindshare.com/files/ebooks/InfiniBand%20Network%20Architecture.pdf

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Re: Testing MCX455A bandwidth between Dell servers

Are you sure you used '-a' flag on both client and server?

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Re: Testing MCX455A bandwidth between Dell servers

Can you please try and put the -a flag as the last flag in the command line on the server? For the client it should be the last flag before the IP of the server.

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Re: Testing MCX455A bandwidth between Dell servers

Thank you.  That fixed it.  Can you explain why?

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Slow 40G->10G Performance when Traffic Flows over MLAG IPL

Hi, I have a pair of SX1410's configured with MLAG. In a situation where a 40G port is trying to send traffic to a 10G port located on the partner switch, the performance is terrible - in this case...

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rdma_create_event_channel: No such device

Software: CentOS 7.2 with their repo provided drivers, libs, and utils.Hardware: ConnectX-2 HCAs. The basic network connections appear good, IPoIBand infiniband-diags utilities do not fail.But when...

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Re: rdma_create_event_channel: No such device

CentOS does install the kernel drivers by default: mlx4_ib.ko, mlx4_en.ko, mlx4_core.ko.But it does not install the user space lib: libmlx4-rdmav2.so$ yum install libmlx4

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Does ConnectX-3 support header split?

I have an system in which performance critically depends upon the ability for the NIC to separate protocol headers and payload into separate buffers.This is a proprietary protocol on top of Ethernet,...

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Re: 'State: Initializing' but works

Can we close this post?

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Re: 'State: Initializing' but works

sorry, i am too busy to work on that issue.I still cannot solve that issue, but please close that post.

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Does MCX3141 only support ubuntu12.04? whether support 14.04 &15.04&15.10 and...

Does MCX3141 only support ubuntu12.04? whether support 14.04 &15.04&15.10 and other new version? more questions: Does MCX3141 support SR-IOV for ROCEv2 in which ubuntu version?

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Re: Testing MCX455A bandwidth between Dell servers

--all / -a flag is a feature that runs traffic on all message size from 2^1 to 2^23When not using this flag, the default message size is 64KB. Which means that if the server side doesn't have the '-a'...

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Re: Does MCX3141 only support ubuntu12.04? whether support 14.04 &15.04&15.10...

I tested MCX3141(connectx_3_pro) in  ubuntu 15.04 version, i find normal network card function don't work, i use ping command to test, test failure, also same issue in ubuntu 14.04. 

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Win2016 Eth connetcx 3 cable unplugged

HiWe tried to connect our servers with connectx3 cards and cisco nexus 9372 by cable mellonox MC2206130-002-А3But cisco and windows shows that cable is unplugged.Before nexus these adapter work fine in...

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