On Mon, 2013-12-16 at 13:13 +0000, lilofile wrote: > mpt2sas 6Gb/s, PCIE 2.0，the card is four port,so theoretical ratio can reach to 2.4Gb/s,it is not bottleneck. I test read two raid5 using dd, > such as dd if=/dev/md0 of=/dev/zero 1M > dd if=/dev/md1 of=/dev/zero 1M > the total read bandwidth can reach to 2.3GB/s,so I/O bus is not a problem. Did you check and see if the controller is using MSIX? I've encountered some mpt2sas defaulted to intx by the driver. Also see if changing rq affinity helps performance? echo 2 > /sys/block/sdX/queue/rq_affinity This should route the HBA interrupts to the core that sent the I/O request. > > ------------------------------------------------------------------ > 发件人：Dag Nygren <dag@xxxxxxxxxx> > 发送时间：2013年12月16日(星期一) 21:06 > 收件人：lilofile <lilofile@xxxxxxxxxx> > 抄 送：Pieter De Wit <pieter@xxxxxxxxxxxxx>; linux-raid <linux-raid@xxxxxxxxxxxxxxx> > 主 题：Re: 答复：two raid5 performance > > On Monday 16 December 2013 15:57:42 lilofile wrote: > > the disks involved in the array is sTEC ssd disk,they are connected by mpt2sas 6Gb/s > > I/O bus to the card? > > Best > Dag > -- > 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 ��.n��������+%������w��{.n�����{����w��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
