On Tue, Feb 02 2010, Jens Axboe wrote: > So the same for 512b buffers, fio is much quicker for 64k (must be due > to proper aligning). I'll boot the big box and see what that says. Same set of tests, only this time using a box with a lot more CPUs and memory bandwidth. 'fio+' is fio with the fix for eliminating lseek(), 'fio' is without that fix. App bs bandwidth ----------------------------------------- dd 512 1.7GB/sec fio 512 1.2GB/sec fio+ 512 1.5GB/sec dd 4k 6.6GB/sec fio 4k 10.3GB/sec fio+ 4k 12.4GB/sec So dd is still faster for small blocks sizes, as expected. I don't think there's any low hanging fruit left for fixing that. At 4k and higher the impact should be neglible, so I don't think it's a huge problem. Most real world testing is 4k or above. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
