I'm having trouble getting decent speeds out of Jgarzik's miner on Ubuntu 10.10 (Phenom II X4 920). I'm only getting 125 kh/s per thread (4 threads), which drops to 50 kh/s with 4way enabled.
The same computer does 10+ mh/s using ufasoft's Win SSE2 miner.
Can someone please enlighten me as to how I can get the same performance under Linux.
If you do a ./minerd --help, is sse2_64 listed as a valid algorithm to use? If not, you need a copy of yasm 1.1 from Debian and use that. That'll compile the SSE2 code. You also need to be running a 64-bit version of Ubuntu.
The SSE2 code is not well-tuned for some AMD architectures, it seems.