PVE 5.1 beta & zfs 0.7.2

[elurex]

I have notice that zfs 0.7.2 on pve 5.1 beta is about 10% slower compare to zfs 0.6.5.11 & pve 5.0

following is my fio testing command for write

fio --ioengine=libaio --name=TEST --filename=test --bs=4M --iodepth=256 --size=65G --readwrite=write; rm test

following is my fio testing command for read

fio --ioengine=libaio --name=test --bs=4M --iodepth=256 --numjobs=2 --size=33G --readwrite=read; rm test*

 

[fabian]

what kind of pool layout and hardware? are you benchmarking a zvol with a file system or a dataset? on the host or inside a guest? what properties are set on the pool and dataset/zvol? what are the actual results? ...

 

[elurex]

1. Seagate 8T 3.5 HDD x8 st8000nm0055 in raid10 (4 vdev) + Intel E3-1275v6 with c236 chipset 64GB RAM + sm961 as cache & log
   
2. dataset and volume both
   
3. host
4. compression=lz4 dedup=off and the rest are default
5. all fio results in both throughput/iops are 10% lower

 

[fabian]

please post the actual numbers and properties also, if you are using the commands you posted you are mainly benchmarking your cache performance, which depends a lot on what else is going on in the system and is not a very meaningful test anyway.