Configuration: global-dhp__io-dbench4-async-ext4 Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4 Benchmarks: dbench4 Summary ======= Nothing majorly exciting although throughput has been declining slightly in a number of cases. However, this is not consistent between machines and latency has also been variable. Broadly speaking, there is not need to take any action here. Benchmark notes =============== mkfs was run on system startup. No attempt was made to age it. No special mkfs or mount options were used. dbench 4 was used. Tests ran for 180 seconds once warmed up. A varying number of clients were used up to 64*NR_CPU. osync, sync-directory and fsync were all off. =========================================================== Machine: arnold Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/arnold/comparison.html Arch: x86 CPUs: 1 socket, 2 threads Model: Pentium 4 Disk: Single Rotary Disk =========================================================== dbench4 ------- In very vague terms, throughput has been getting worse over time but it's very gradual. Latency has also been getting worse. ========================================================== Machine: hydra Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/hydra/comparison.html Arch: x86-64 CPUs: 1 socket, 4 threads Model: AMD Phenom II X4 940 Disk: Single Rotary Disk Status: Ok ========================================================== dbench4 ------- This is a mixed bag, there are gains and losses and it's hard to draw any meaningful conclusion. ========================================================== Machine: sandy Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/sandy/comparison.html Arch: x86-64 CPUs: 1 socket, 8 threads Model: Intel Core i7-2600 Disk: Single Rotary Disk Status: ========================================================== dbench4 ------- For the most part, there are few changes of note. Latency has been getting better particularly in 3.2 and later kernels. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>