Hello All, As the release notes of SSH-4.7 version says that a new MAC algorithm (UMAC-64 - RFC4418) was introduced with OpenSSH-4.7 which gives much better performance, I was tempted to check out the enhanced speed provided with new version. So I downloaded OpenSSH-5.1p1 and build it on Solaris 10 with Sun Compiler CC. My test setup:- 1. Two Sunfire 440 with 2 CPU (1281 MHz) and 4GB RAM. 2. Network interface supports 1 Gbit/s (duplex) I tried transferring 1GB file between Node A and Node B connected using 1GB interface using SCP. Node A can connect to Node B without password using public key authentication. With OpenSSH-5.1p1:- ------------------------ Protocol Time taken rate MB/s Std. scp 53.7 19.3 scp -c arcfour 40.1 26.3 scp -c blowfish 55.5 18.6 scp -C 123.6 16.3 With OpenSSH-4.5p1:- ------------------------- Protocol Time taken rate MB/s Std. scp 59.9 17.9 scp -c arcfour 45 22.3 scp -c blowfish 59.6 17.1 scp -C 131 14.1 I do not see any higher throughput (20%) with the 5.1p1 (with UMAC-64) than 4.5p1. The above results clearly says it is not increasing the performance by 20%. Did I something here?. Also does UMAC-64 have a impact on scp also or my understanding is wrong?. Thanks inadvance Senthil Prabu.S -- Senthil Prabu.S
