Openblas sgemm is slower for small size matrices in aarch64

[akote123]

I have built openblas in graviton3E with make USE_OPENMP=1 NUM_THREADS=256 TARGET=NEOVERSEV1. mkl is built in icelake machine.

I have used openblas sgemm as cblas_sgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, M, N, K, 1.0, A, K, B, N, 0.0, C, N);

When performance timings are compared with intel mkl for the the smaller size matmuls, aarch64 is slower .

These are the different shapes I have checked and their timings.