scheduler used in VM

[mir]

Hi all,

Inspired by a thread about ceph and which scheduler to use in a VM I made a quick test using fio. Results are stunning so I hope others can duplicate my results?
My storage is based on ZFS.

Test file used:

# This job file tries to mimic the Intel IOMeter File Server Access Pattern
[global]
description=Emulation of Intel IOmeter File Server Access Pattern

Sorry, wrong forum

[iometer]
bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10
rw=randrw
rwmixread=80
direct=1
size=4g
ioengine=libaio
# IOMeter defines the server loads as the following:
# iodepth=1    Linear
# iodepth=4    Very Light
# iodepth=8    Light
# iodepth=64    Moderate
# iodepth=256    Heavy
iodepth=64

Results

            NFS               iSCSI
CFQ   r:4537 w:1130    r:  6927 w: 1733
NOOP  r:7484 w:1874    r: 11454 w: 2874

It seems scheduler has a big impact on performance when dealing with file systems with native sophisticated caching.