./openssl-generic32 speed rsa1024 rsa2048
rsa 1024 bits 0.342000s 0.010615s      2.9     94.2
rsa 2048 bits 1.328750s 0.027632s      0.8     36.2


./openssl-mips32r2 speed rsa1024 rsa2048
rsa 1024 bits 0.128228s 0.008619s      7.8    116.0
rsa 2048 bits 1.055000s 0.023870s      0.9     41.9

As for rsa2048 sign result. Try following. Open crypto/bn/asm/mips-mont.pl in text editor, locate line that reads

        slt     $at,$num,17

replace 17 with 33, make and retry. Essentially the number varies for processor to processor and this one what found optimal for R5000.

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