> On Saturday, July 29, 2023 at 12:18:04 PM PDT, Tom Brennan > <t...@tombrennansoftware.com> wrote: > Where does "1,600 PCIe slots" come from? If I calculated max configurable PCIe slots correctly, 4 CPC drawers * 12 PCIe+ fanout adapters * 2 fanout ports per adapter * 16 PCIe+ slots in each drawer = 1,536 PCIe+ slots. Sorry that I couldn't remember the exact number but I also said PCIe instead of PCIe+. PCIe by other manufactures comes in 8, 16 & 32 wires (called lanes where each lane transmits 1 bit). I suspect that PCIe+ is 64 lanes transmitting 64 bits simultaneously. These are beasts compared to PC PCIe slots but the implementation is the same.
On page 22 of https://www.redbooks.ibm.com/redbooks/pdfs/sg248950.pdf Fanouts - Each CPC drawer supports up to 12 PCIe+ fanout adapters to connect to the PCIe+ I/O drawers, and Integrated Coupling Adapter Short Reach (ICA SR) coupling links: – A 2-port Peripheral Component Interconnect Express (PCIe) 16 GBps I/O fanout. Each port supports one domain in the 16-slot PCIe+ I/O drawers . – ICA SR1.1 and ICA SR PCIe fanouts for coupling links (two links of 8 GBps each). On Saturday, July 29, 2023 at 12:18:04 PM PDT, Tom Brennan <t...@tombrennansoftware.com> wrote: Where does "1,600 PCIe slots" come from? On 7/29/2023 9:28 AM, Jon Perryman wrote: > 2. Hardware does not make a mainframe. IBM z16 has PCIe and ram which are > also on every modern motherboard. IBM z16 chooses not to include other > hardware (e.g. SATA, IDE, WIFI and more). Motherboards choose not to have > 1,600 PCIe slots. IBM could allow PCIe graphics cards, mice, keyboards and > more. Essentially, IBM z16 and AMD Ryzen can implement the same hardware if > there was enough customer demand. > > 3. OS does not make a mainframe. Linux running on z16 doesn't make it > mainframe Linux. There's nothing stopping Linux from taking advantage of > every z16 hardware feature (e.g. 1,600 PCIe slots) but no one is willing to > build the Linux software. IBM hasn't duplicated z/OS software features in > Linux. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
