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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
View ArticleRe: Testing MCX455A bandwidth between Dell servers
Are you sure you used '-a' flag on both client and server?
View ArticleRe: 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.
View ArticleRe: 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...
View Articlerdma_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...
View ArticleRe: 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
sorry, i am too busy to work on that issue.I still cannot solve that issue, but please close that post.
View ArticleDoes 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?
View ArticleRe: 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'...
View ArticleRe: 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.
View ArticleWin2016 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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Re: Slow 40G->10G Performance when Traffic Flows over MLAG IPL
Hi, Can you attach a basic topology diagram, showing the ports with the performance problem, and how they are connected?Are the inter-switch ports showing any discards or errors?Are the inter-switch...
View ArticleRe: ibv_post_send is slow in ping-pong
clock_gettime has its own overhead that need to be taken into calculations. What are your expectations?What are the the results of ib_read_lat/ib_write_lat/ib_send_lat on the systems connected...
View ArticleRe: Slow 40G->10G Performance when Traffic Flows over MLAG IPL
Hi, The issue has been resolved via support. The config was missing the following: interface port-channel 1 vlan map-priority 0 traffic-class 1dcb priority-flow-control priority 0 enable It may be...
View ArticleRe: Slow 40G->10G Performance when Traffic Flows over MLAG IPL
Great - thanks for the update.
View ArticleMellanox ConnectX2 quad Rate IB Mezz card stopped functioning on Dell M710 blade
These Mellanox ConnectX2 quad Rate IB Mezz cards have been working on our Dell HPCC cluster for the past 5 years without any problems (t was setup by Dell in the past). Apparently one of the cluster...
View ArticleRe: Win2016 Eth connetcx 3 cable unplugged
Have you changed the cable connectivity from Ethernet to InfiniBand or vice versa? if you did then cable link may disappear (known issue)Else, it looks though you may have a port type configuration...
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