what sort of controller do you have and how is it connected ? are you testing on a filesystem or directly at the md device ? 2013/12/16 lilofile <lilofile@xxxxxxxxxx>: > Yes,I test like what you say,but the result is the same. > > > ------------------------------------------------------------------ > 发件人：Tommy Apel <tommyapeldk@xxxxxxxxx> > 发送时间：2013年12月16日(星期一) 20:45 > 收件人：lilofile <lilofile@xxxxxxxxxx> > 抄 送：linux-raid Raid <linux-raid@xxxxxxxxxxxxxxx> > 主 题：Re: 答复：答复：two raid5 performance > > try this, this will put a dd on different cores so that you don't > starve one core with both dd processes > taskset 1 dd if=/dev/zero of=raidset1 > taskset 2 dd if=/dev/zero of=raidset2 > > 2013/12/16 lilofile <lilofile@xxxxxxxxxx>: >> In dd test,I use Linux top tools,and I found 2 raid use different cores, CPU occupancy of each raid5 reach to 80% , is any lock contention between two raid? >> >> >> ------------------------------------------------------------------ >> 发件人：Tommy Apel <tommyapeldk@xxxxxxxxx> >> 发送时间：2013年12月16日(星期一) 16:13 >> 收件人：lilofile <lilofile@xxxxxxxxxx> >> 抄 送：Pieter De Wit <pieter@xxxxxxxxxxxxx>; linux-raid Raid <linux-raid@xxxxxxxxxxxxxxx>; Tommy Apel <tommyapeldk@xxxxxxxxx> >> 主 题：Re: 答复：two raid5 performance >> >> Try to use taskset command to make sure the dd commands are handled by different cores otherwise you'll starve 1 core. >> On Dec 16, 2013 8:58 AM, "lilofile" <lilofile@xxxxxxxxxx> wrote: >> >> the disks involved in the array is sTEC ssd disk,they are connected by mpt2sas 6Gb/s >> >> >> >> >> >> ------------------------------------------------------------------ >> >> 发件人：Pieter De Wit <pieter@xxxxxxxxxxxxx> >> >> 发送时间：2013年12月16日(星期一) 15:52 >> >> 收件人：lilofile <lilofile@xxxxxxxxxx>; unlisted-recipients: <unlisted-recipients:> >> >> 抄 送：linux-raid <linux-raid@xxxxxxxxxxxxxxx> >> >> 主 题：Re: two raid5 performance >> >> >> >> On 16/12/2013 14:07, lilofile wrote: >> >>> when I Create a raid5,dd 1M block size,the performance can reached to 1GB/s >> >>> when I create another raid5,dd 1M block size ,the performance can reached to 1GB/s >> >>> when I simultaneously dd the two different raid,the total performance only reached to 1.4GB/s,why can not reached to 2GB/s. >> >>> >> >>> the memory is 32GB,CPU is x5660,the stripe size is 4096 >> >>> -- >> >>> 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 >> >> What is the disks involved in the array ? How are they connected ? >> >> -- >> >> 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 >> >> >> > > > > -- > > /Tommy -- /Tommy -- 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
