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Question about BW and PPS? #225

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ReyRen opened this issue Sep 13, 2023 · 1 comment
Open

Question about BW and PPS? #225

ReyRen opened this issue Sep 13, 2023 · 1 comment

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@ReyRen
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ReyRen commented Sep 13, 2023

Hello，
My IB network card has a bandwidth of 100 Gbps. When I conducted bandwidth testing using "ib_write_bw," the "BW average[MB/sec]" value was 11728.47, which falls within the expected range. However, when I simultaneously analyzed the packet captures using "ibdump," I found that the peak IO displayed was only 500,000 packets/s, and Wireshark indicated that each packet was approximately 4138 bytes. Calculating this, the peak would be 2 GB/s, which is significantly different from the value of 11728.47 MB/s. What could be the reason for this discrepancy?
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Your support is greatly appreciated.
@ReyRen
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ReyRen commented Sep 13, 2023

The result of MsgRate from ib_write_bw is different with wireshark I/O packets/s using ibdump catched. Why it's different?

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