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Brocade IP Ethernet issues

min $50 USD / hour

Closed
Posted almost 7 years ago

min $50 USD / hour

Problem Description: Basically, I cannot get four separate (with identical HW and OS) servers with 40GbE Intel XL710 NICs to sustain 30-40Gbits/sec using perf or iperf3 with or without multi-threading. These servers are quite modern with 20 logical cores and the latest PCI backplane technology (5GBytes/sec per slot that is associated with a particular CPU socket). We see many retransmits during our iperf3 tests, but no L1 errors on the switch links. The retransmits are a huge clue, I suppose. All connection between servers during testing are on the same switch and same subnet. Hardware we are working with: Hardware Vendor:ICX7750-48C BROCADE ICX 7750 WITH 48 1/20 GBE RJ-45P Hardware Vendor:ICX7750-26Q Brocade ICX 7750 with 26 40 GBE Qsfp=Por
Project ID: 13906871

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2 proposals
Remote project
Active 7 yrs ago

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Hello! Provided you observe neither L1/L2 transmission nor queueing errors at the switches, retransmits may indicate a queueing problem within server's OS, which I suppose is Linux. Default Linux is typically not the optimal one for handling such high amount of traffic, so it needs to be tweaked, involving a lot of kernel and drivers performance analysis and tuning (I'm assuming you've already performed some basic tuning, like unloading iptables kernel modules). Kindly let me know if you want me to do this job for you.
$65 USD in 20 days
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I want to discuss this project with you further, let me know the best suitable time for you to schedule the meeting, Feel free to message me at any time, i used to be online 14 hrs in a day on this website so probably you will get a quick response from my end..
$51 USD in 40 days
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