Bug 217069

Hello,

During the development for our new platform, armada380 based, I see that the "standard" version of memmove/memcpy is faster than the "xscale" one.

For that, I just remove the _ARM_ARCH_5E define into the file sys/arm/arm/support.S.

There is the results:

Block size: 2048
memcpy (Kernel ARM)                  :   1028.7 MB/s
memmove (Kernel ARM)               :    616.5 MB/s
memcpy (Kernel xscale)               :    920.1 MB/s
memmove (Kernel xscale)            :    618.8 MB/s

Block size: 128
memcpy (Kernel ARM)                  :   1018.5 MB/s
memmove (Kernel ARM)               :    668.4 MB/s
memcpy (Kernel xscale)               :    825.9 MB/s
memmove (Kernel xscale)            :    668.6 MB/s

Block size: 64
memcpy (Kernel ARM)                  :    892.9 MB/s
memmove (Kernel ARM)               :    667.2 MB/s
memcpy (Kernel xscale)               :    721.2 MB/s
memmove (Kernel xscale)            :    668.2 MB/s

Block size: 32
memcpy (Kernel ARM)                  :    620.6 MB/s
memmove (Kernel ARM)               :    634.6 MB/s
memcpy (Kernel xscale)               :    504.9 MB/s
memmove (Kernel xscale)            :    634.5 MB/s

Block size: 16
memcpy (Kernel ARM)                  :    471.8 MB/s
memmove (Kernel ARM)               :    464.5 MB/s
memcpy (Kernel xscale)               :    254.5 MB/s
memmove (Kernel xscale)            :    464.7 MB/s

Please note that the userland suffer the same problem, and the standard "ARM" is a little bit more efficient.

I'm available to test any point you want.

Best regards

Alexandre Martins