Tried this... it results in the same :( On Thu, Aug 11, 2011 at 5:01 PM, Mathias Burén <mathias.buren@xxxxxxxxx> wrote: > 11 August 2011 16:58, mark delfman <markdelfman@xxxxxxxxxxxxxx> wrote: >> I seem to have hit a significant hard stop in MD RAID1/10 performance >> which seems to be linked to a single CPU thread. >> >> I am using extremely high speed (IOPS) internal block devices – 8 in >> total. They are capable of achieving > 1million iops. >> >> However if I use RAID1 / 10 then MD seems to use a single thread which >> will reach 100% CPU utilisation (single core) at around 200K IOPS. >> Limiting the entire performance to around 200K. >> >> If I use say 4 x RAID1 / 10’s and a RAID0 on top – I see not much >> greater results. (although the theory seems to say I should and there >> are now 4 CPU threads running, it still seems to hit 4 x 100% at maybe >> 350K). >> >> Is there any way to increase the number of threads per RAID set? Or >> any other suggestions on configurations? (I have tried every >> permutation of R0+R1/10’s) >> >> Thank you for any advice. >> >> >> Mark >> -- >> 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 >> > > Maybe create separate MD RAID1 devices, then a new MD device with > RAID0? (instead of using mdadm RAID"10") > > /M > -- 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
