Date: Fri, 3 Mar 2017 23:34:56 +0100 From: Dirk-Willem van Gulik <dirkx@webweaving.org> To: freebsd-hackers@freebsd.org Subject: PCI speed Message-ID: <03745A05-DE0E-4071-B432-BFE58C3A7E16@webweaving.org>
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Forgive me my ignorance - but for some cards - pciconf(8) nicely lists the speed of the bus: > ciss0@pci0:12:0:0: class=0x010400 card=0x3243103c chip=0x323a103c rev=0x01 hdr=0x00 ... > cap 10[70] = PCI-Express 2 endpoint max data 128(256) RO NS > link x4(x8) speed 5.0(5.0) > cap 11[ac] = MSI-X supports 16 messages, enabled > Table in map 0x10[0x1c2000], PBA in map 0x10[0x1c4000] > PCI-e errors = Correctable Error Detected > Fatal Error Detected > Unsupported Request Detected and that matches exactly with what it is. While for other cards it does not seem to report that: > mpt4@pci0:7:8:1: class=0x010000 card=0x10b01000 chip=0x00301000 rev=0x08 hdr=0x00 .... > cap 01[50] = powerspec 2 supports D0 D1 D2 D3 current D0 > cap 05[58] = MSI supports 1 message, 64 bit > cap 07[68] = PCI-X 64-bit supports 133MHz, 2048 burst read, 8 split transactions > cap 00[70] = unknown and in fact seems to mis report the bus - this is a PCIe Gen 2 x4 bus with a x8 Connector Width holding a LSI 22320SE Ultra320 SCSI dual channel PCIe X4 card. How should one interpret this ? Dw.
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