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Diffstat (limited to 'results/scraper/launchpad-without-comments/1853042')
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diff --git a/results/scraper/launchpad-without-comments/1853042 b/results/scraper/launchpad-without-comments/1853042 new file mode 100644 index 00000000..12af8ce6 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1853042 @@ -0,0 +1,81 @@ +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 |