https://community.intel.com/t5/Software-Tuning-Performance/Understanding-PCIe-bandwidth/m-p/1130306#M6394 <P>Hello. &nbsp;I'm trying to understand the results of pcm-pcie. &nbsp;I read the Bytes option will multiply the number of transfers by 64 Bytes. &nbsp;So in this case it would be 11M (PCIeRdCur) times 64B, which would be 704MB. &nbsp;However, the PCIe Rd (B) column shows a much larger number 3323M. &nbsp;How does this math work?</P><P>&nbsp;</P><P>Also, socket 0 shows more transfers in the PCIeRdCur column, but socket 1 shows more data in the Bytes column. &nbsp;I don't understand.</P><P>&nbsp;</P> <PRE class="brush:bash; class-name:dark;">Skt | PCIeRdCur | RFO | CRd | DRd | ItoM | PRd | WiL | PCIe Rd (B) | PCIe Wr (B) 0 11 M 380 K 18 M 21 M 3110 K 18 K 9336 3323 M 223 M 1 2443 K 97 K 28 M 39 M 3110 K 216 65 K 4518 M 205 M ---------------------------------------------------------------------------------------------------- * 14 M 478 K 47 M 60 M 6220 K 18 K 75 K 7841 M 428 M </PRE> <P>&nbsp;</P> Wed, 09 Jan 2019 21:56:24 GMT Balsley__Elliott 2019-01-09T21:56:24Z https://community.intel.com/t5/Software-Tuning-Performance/Understanding-PCIe-bandwidth/m-p/1130306#M6394 <P>Hello. &nbsp;I'm trying to understand the results of pcm-pcie. &nbsp;I read the Bytes option will multiply the number of transfers by 64 Bytes. &nbsp;So in this case it would be 11M (PCIeRdCur) times 64B, which would be 704MB. &nbsp;However, the PCIe Rd (B) column shows a much larger number 3323M. &nbsp;How does this math work?</P><P>&nbsp;</P><P>Also, socket 0 shows more transfers in the PCIeRdCur column, but socket 1 shows more data in the Bytes column. &nbsp;I don't understand.</P><P>&nbsp;</P> <PRE class="brush:bash; class-name:dark;">Skt | PCIeRdCur | RFO | CRd | DRd | ItoM | PRd | WiL | PCIe Rd (B) | PCIe Wr (B) 0 11 M 380 K 18 M 21 M 3110 K 18 K 9336 3323 M 223 M 1 2443 K 97 K 28 M 39 M 3110 K 216 65 K 4518 M 205 M ---------------------------------------------------------------------------------------------------- * 14 M 478 K 47 M 60 M 6220 K 18 K 75 K 7841 M 428 M </PRE> <P>&nbsp;</P> Wed, 09 Jan 2019 21:56:24 GMT https://community.intel.com/t5/Software-Tuning-Performance/Understanding-PCIe-bandwidth/m-p/1130306#M6394 Balsley__Elliott 2019-01-09T21:56:24Z