Re: [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios
From: Ming Lin
Date: Wed Jun 10 2015 - 17:20:54 EST
On Mon, Jun 8, 2015 at 11:09 PM, Ming Lin <mlin@xxxxxxxxxx> wrote:
> On Thu, 2015-06-04 at 17:06 -0400, Mike Snitzer wrote:
>> We need to test on large HW raid setups like a Netapp filer (or even
>> local SAS drives connected via some SAS controller). Like a 8+2 drive
>> RAID6 or 8+1 RAID5 setup. Testing with MD raid on JBOD setups with 8
>> devices is also useful. It is larger RAID setups that will be more
>> sensitive to IO sizes being properly aligned on RAID stripe and/or chunk
>> size boundaries.
>
> Here are tests results of xfs/ext4/btrfs read/write on HW RAID6/MD RAID6/DM stripe target.
> Each case run 0.5 hour, so it took 36 hours to finish all the tests on 4.1-rc4 and 4.1-rc4-patched kernels.
>
> No performance regressions were introduced.
>
> Test server: Dell R730xd(2 sockets/48 logical cpus/264G memory)
> HW RAID6/MD RAID6/DM stripe target were configured with 10 HDDs, each 280G
> Stripe size 64k and 128k were tested.
>
> devs="/dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk"
> spare_devs="/dev/sdl /dev/sdm"
> stripe_size=64 (or 128)
>
> MD RAID6 was created by:
> mdadm --create --verbose /dev/md0 --level=6 --raid-devices=10 $devs --spare-devices=2 $spare_devs -c $stripe_size
>
> DM stripe target was created by:
> pvcreate $devs
> vgcreate striped_vol_group $devs
> lvcreate -i10 -I${stripe_size} -L2T -nstriped_logical_volume striped_vol_group
>
> Here is an example of fio script for stripe size 128k:
> [global]
> ioengine=libaio
> iodepth=64
> direct=1
> runtime=1800
> time_based
> group_reporting
> numjobs=48
> gtod_reduce=0
> norandommap
> write_iops_log=fs
>
> [job1]
> bs=1280K
> directory=/mnt
> size=5G
> rw=read
>
> All results here: http://minggr.net/pub/20150608/fio_results/
>
> Results summary:
>
> 1. HW RAID6: stripe size 64k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 821.23 812.20 -1.09%
> xfs write: 753.16 754.42 +0.16%
> ext4 read: 827.80 834.82 +0.84%
> ext4 write: 783.08 777.58 -0.70%
> btrfs read: 859.26 871.68 +1.44%
> btrfs write: 815.63 844.40 +3.52%
>
> 2. HW RAID6: stripe size 128k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 948.27 979.11 +3.25%
> xfs write: 820.78 819.94 -0.10%
> ext4 read: 978.35 997.92 +2.00%
> ext4 write: 853.51 847.97 -0.64%
> btrfs read: 1013.1 1015.6 +0.24%
> btrfs write: 854.43 850.42 -0.46%
>
> 3. MD RAID6: stripe size 64k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 847.34 869.43 +2.60%
> xfs write: 198.67 199.03 +0.18%
> ext4 read: 763.89 767.79 +0.51%
> ext4 write: 281.44 282.83 +0.49%
> btrfs read: 756.02 743.69 -1.63%
> btrfs write: 268.37 265.93 -0.90%
>
> 4. MD RAID6: stripe size 128k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 993.04 1014.1 +2.12%
> xfs write: 293.06 298.95 +2.00%
> ext4 read: 1019.6 1020.9 +0.12%
> ext4 write: 371.51 371.47 -0.01%
> btrfs read: 1000.4 1020.8 +2.03%
> btrfs write: 241.08 246.77 +2.36%
>
> 5. DM: stripe size 64k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 1084.4 1080.1 -0.39%
> xfs write: 1071.1 1063.4 -0.71%
> ext4 read: 991.54 1003.7 +1.22%
> ext4 write: 1069.7 1052.2 -1.63%
> btrfs read: 1076.1 1082.1 +0.55%
> btrfs write: 968.98 965.07 -0.40%
>
> 6. DM: stripe size 128k
> 4.1-rc4 4.1-rc4-patched
> ------- ---------------
> (MB/s) (MB/s)
> xfs read: 1020.4 1066.1 +4.47%
> xfs write: 1058.2 1066.6 +0.79%
> ext4 read: 990.72 988.19 -0.25%
> ext4 write: 1050.4 1070.2 +1.88%
> btrfs read: 1080.9 1074.7 -0.57%
> btrfs write: 975.10 972.76 -0.23%
Hi Mike,
How about these numbers?
I'm also happy to run other fio jobs your team used.
Thanks.
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