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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.
\ No newline at end of file