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EPYC Discussions

ajschorr
Journeyman III

do EPYC Genoa CPUs have direct cache access (DCA), the equivalent of Intel Data Direct I/O (DDIO)?

Hi,

The subject says it all. Do the EPYC Genoa 9004 CPUs have DCA to reduce network packet processing latency?

I think this can be detected by searching for "dca" in /proc/cpuinfo or lscpu flags output,

or by looking in the output of cpuid for DCA or direct cache access. If you have one available,

what do these commands show?

 

lscpu | grep -w dca

 

cpuid -1 | egrep -A2 -i 'dca|direct cache'

 

Thanks,

Andy

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