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From [http://www.intel.com/Assets/PDF/appnote/241618.pdf Intel Application Note 485], "Intel Processor Identification and the CPUID Instruction", section 3.1.10: When EAX is initialized to a value of 9, the CPUID instruction returns DCA information in the EAX, EBX, ECX and EDX registers | From [http://www.intel.com/Assets/PDF/appnote/241618.pdf Intel Application Note 485], "Intel Processor Identification and the CPUID Instruction", section 3.1.10: | ||
* EAX: Value of PLATFORM_DCA_CAP MSR Bits [31:0] (Offset 1F8h) | <blockquote>When EAX is initialized to a value of 9, the [[cpuid|CPUID]] instruction returns DCA information in the EAX, EBX, ECX and EDX registers: | ||
* EBX: Reserved | *EAX: Value of PLATFORM_DCA_CAP MSR Bits [31:0] (Offset 1F8h) | ||
* ECX: Reserved | *EBX: Reserved | ||
* EDX: Reserved | *ECX: Reserved | ||
*EDX: Reserved</blockquote> | |||
I've got a list of [[Hardware detritus#NICs|DCA-enabled NICs]]. | |||
DCA requires both hardware and software support. Its successor, [[DDIO]], does not. | |||
==See Also== | ==See Also== | ||
[http://www.stanford.edu/group/comparch/papers/huggahalli05.pdf "Direct Cache Access for High Bandwidth Network I/O"] | *[http://www.stanford.edu/group/comparch/papers/huggahalli05.pdf "Direct Cache Access for High Bandwidth Network I/O"] | ||
*[http://doi.ieeecomputersociety.org/10.1109/MC.2004.223 "TCP Onloading for Data Center Severs"] | |||
*[http://www.eecs.umich.edu/techreports/cse/2004/CSE-TR-505-04.pdf "Analyzing NIC Overheads in Network-Intensive Workloads"] | |||
[[Category: Hardware]] | |||
[[Category: x86]] | |||
Latest revision as of 01:06, 22 January 2023
From Intel Application Note 485, "Intel Processor Identification and the CPUID Instruction", section 3.1.10:
When EAX is initialized to a value of 9, the CPUID instruction returns DCA information in the EAX, EBX, ECX and EDX registers:
- EAX: Value of PLATFORM_DCA_CAP MSR Bits [31:0] (Offset 1F8h)
- EBX: Reserved
- ECX: Reserved
- EDX: Reserved
I've got a list of DCA-enabled NICs.
DCA requires both hardware and software support. Its successor, DDIO, does not.
