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+
+Ubuntu 18.04 - vm disk i/o performance issue when using file system passthrough
+
+== Comment: #0 - I-HSIN CHUNG <email address hidden> - 2019-11-15 12:35:05 ==
+---Problem Description---
+Ubuntu 18.04 - vm disk i/o performance issue when using file system passthrough
+ 
+Contact Information = <email address hidden> 
+ 
+---uname output---
+Linux css-host-22 4.15.0-1039-ibm-gt #41-Ubuntu SMP Wed Oct 2 10:52:25 UTC 2019 ppc64le ppc64le ppc64le GNU/Linux (host) Linux ubuntu 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:08:54 UTC 2019 ppc64le ppc64le ppc64le GNU/Linux (vm)
+ 
+Machine Type = p9/ac922 
+ 
+---Debugger---
+A debugger is not configured
+ 
+---Steps to Reproduce---
+ 1. Env: Ubuntu 18.04.3 LTS?Genesis kernel linux-ibm-gt - 4.15.0-1039.41?qemu 1:2.11+dfsg-1ubuntu7.18 ibmcloud0.3 or 1:2.11+dfsg-1ubuntu7.19 ibm-cloud1?fio-3.15-4-g029b
+
+2. execute run.sh to run fio benchmark:
+
+2.1) run.sh:
+#!/bin/bash
+  
+for bs in  4k 16m
+do
+
+for rwmixread in 0 25 50 75 100
+do
+
+for numjobs in 1 4 16 64
+do
+echo ./fio j1.txt --bs=$bs --rwmixread=$rwmixread --numjobs=$numjobs
+./fio j1.txt --bs=$bs --rwmixread=$rwmixread --numjobs=$numjobs
+
+done
+done
+done
+
+2.2) j1.txt:
+
+[global]
+direct=1
+rw=randrw
+refill_buffers
+norandommap
+randrepeat=0
+ioengine=libaio
+iodepth=64
+runtime=60
+
+allow_mounted_write=1
+
+[job2]
+new_group
+filename=/dev/vdb
+filesize=1000g
+cpus_allowed=0-63
+numa_cpu_nodes=0
+numa_mem_policy=bind:0
+
+3. performance profile:
+device passthrough performance for the nvme: 
+http://css-host-22.watson.ibm.com/rundir/nvme_vm_perf_vm/20191011-112156/html/#/measurement/vm/ubuntu (I/O bandwidth achieved inside VM in GB/s range)
+
+file system passthrough
+http://css-host-22.watson.ibm.com/rundir/nvme_vm_perf_vm/20191106-123613/html/#/measurement/vm/ubuntu (I/o bandwidth achieved inside the VM is very low)
+
+desired performance when using file system passthrough should be similar to the device passthrough
+ 
+Userspace tool common name: fio 
+ 
+The userspace tool has the following bit modes: should be 64 bit 
+
+Userspace rpm: ? 
+
+Userspace tool obtained from project website:  na 
+ 
+*Additional Instructions for <email address hidden>: 
+-Post a private note with access information to the machine that the bug is occuring on.
+-Attach ltrace and strace of userspace application.
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