Intel DC3700 & LIO

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I have a Intel DC3700 800G Pcieflash which I'm trying to benchmark
with LIO.  I see a discrepancy in fio benchmarks on this devices when
running directly (/dev/nvme0n1) and when running via iscsi.

The following fio file produces about 400k iops on 100% read.   A
identical fio file run over a ISCSI device to LIO where the backstore
is the same flash /dev/nvme0n1  produces about 40k iops.

Is there something I am missing?   The queue depth is 32, but the
numbers do not change even when bumped upto 128.

Thanks for the help
Suresh


----------------------------

[global]
description=Emulation of Intel IOmeter File Server Access Pattern
filename=/dev/nvme0n1
[iometer]
bssplit=4k/100
rw=randread
direct=1
size=18000m
ioengine=libaio

iodepth_batch=4
iodepth_batch_complete=32
numjobs=64
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