Re: [Xen-users] File-based domU - Slow storage write since xen 4.8

[Benoit Depail <benoit.depail@xxxxxxxxxxxxxx>]

On 07/17/17 14:49, Roger Pau Monné wrote:
> On Mon, Jul 17, 2017 at 11:11:20AM +0200, Benoit Depail wrote:
> In order to try to figure out the problem, can you try Xen 4.9 with
> Linux kernel 3.16?
> 

Good call !

So, with this configuration :

dom0# xl info
host                   : ikea
release                : 3.16.0-4-amd64
version                : #1 SMP Debian 3.16.43-2 (2017-04-30)
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 23
nr_nodes               : 4
cores_per_socket       : 12
threads_per_core       : 1
cpu_mhz                : 2200
hw_caps                :
178bf3ff:80802001:efd3fbff:000837ff:00000000:00000000:00000000:00000100
virt_caps              : hvm
total_memory           : 49147
free_memory            : 45572
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 8
xen_extra              : .1
xen_version            : 4.8.1
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : dom0_mem=2G,max:2G dom0_max_vcpus=2 dom0_vcpus_pin
cc_compiler            : gcc (Debian 6.3.0-16) 6.3.0 20170425
cc_compile_by          : ian.jackson
cc_compile_domain      : eu.citrix.com
cc_compile_date        : Tue May  2 14:06:04 UTC 2017
build_id               : 0b619fa14fca0e6ca76f2a8b52eba64d60aa37de
xend_config_format     : 4

The writing performances are the same in the dom0 and in the domU.

In the mean time I found that the problem is not NFS specific so I'll
stick to raw image files on the local disks, to keep things simple.

I'll see if I can roughly pinpoint the kernel version that trigger this
behaviour.

Thanks _a lot_ for your help. This is a good enough work around for us,
so we can start extensive testing to get xen 4.8 in production.

Best regards,

-- 
Benoit Depail
Senior Infrastructures Architect
NBS System

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