View source for Direct Cache Access

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: 
<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:
*EAX: Value of PLATFORM_DCA_CAP MSR Bits [31:0] (Offset 1F8h)
*EBX: 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==
*[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]]