On 11/28/2013 4:02 AM, lilofile wrote: > thank you for your advise. now I have test multi-thread patch, the single raid5 performance improve 30%. > > but I have another problem,when write on single raid,write performance is approx 1.1GB/s ... > [1]- Done dd if=/dev/zero of=/dev/md126 count=100000 bs=1M > [2]+ Done dd if=/dev/zero of=/dev/md127 count=100000 bs=1M No. This is not a parallel IO test. ... > To address #3 use FIO or a similar testing tool that can issue IOs in > parallel. With SSD based storage you will never reach maximum > throughput with a serial data stream. This is a parallel IO test, one command line: ~# fio --directory=/dev/md126 --zero_buffers --numjobs=16 --group_reporting --blocksize=64k --ioengine=libaio --iodepth=16 --direct=1 --size=64g --name=read --rw=read --stonewall --name=write --rw=write --stonewall Normally this targets a filesystem, not a raw block device. This command line should work for a raw md device. -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
