40Gbe throttling issue

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lahatte

New Member
Jul 8, 2020
27
3
3
I have one of these 40Gbe NICs ( HP 544QSFP MCX354A-FCBT 649281-B21 656089-001 VPI FDR 40GbE Mellanox OEMFirmware | eBay ) installed on my Windows 10 computer that is using an Asrock Fatality x399 Gaming motherboard. I'm using the same NIC on other computers on this same network without issue.

The issue I'm having on this one problem computer is during a file transfer it throttles back. It will start downloading or uploading at 2g per sec but then quickly throttles back to 200mb per sec... any ideas what could be causing this? If I get on another computer and transfer from or to this problem computer, the transfer rate is sustained over 1g no issues. It's only when this problem machine initiates anything that I have the throttling issue.

I've tried 2 different 40Gbe cards and both have identical issue. I've tried jumbo packets of all sizes, and 9214 seems to be most stable. I've disabled antivirus. Any help is greatly appreciated. Thanks!
 

lahatte

New Member
Jul 8, 2020
27
3
3
actually, I figured this out... I feel totally stupid. I should have used iperf3 and not gone by simple file transfers of large files to test.... LOL
 
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