Re: [Xen-users] IO is a big difference between the "file" and "phy"

[ÐÑÑÐÐÐ ÐÐÑÐÐÐÐ <ufaweb@xxxxxxxxx>]

2012/6/13 Fajar A. Nugraha <list@xxxxxxxxx>
> That's a known issue.
>
> Depending on your configuration, dom0 kernel version, and type of
> test, file:/ can be MUCH faster, or MUCH slower compared to phy:/, due
> to interaction of dom0 filesystem, loopback driver, and dom0 kernel
> cache. ÂBut it shouldn't matter in production environment, as you're
> NOT supposed to use file:/ anyway, since (on some circumstances) it
> can cause data corruption.

Ok, but it depends on what and how this problem can be solved?

dom0:
root@nas-1:/etc# uname -a
Linux nas-1 3.2.0-2-amd64 #1 SMP Fri Jun 1 17:49:08 UTC 2012 x86_64 GNU/Linux
root@nas-1:/etc# xen info
host                   : nas-1
release                : 3.2.0-2-amd64
version                : #1 SMP Fri Jun 1 17:49:08 UTC 2012
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 3006
hw_caps                :
178bf3ff:efd3fbff:00000000:00001710:00802001:00000000:000037ff:00000000
virt_caps              : hvm
total_memory           : 16383
free_memory            : 14024
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .2
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          : unavailable
xen_commandline        : placeholder dom0_mem=2048M dom0_max_vcpus=1
dom0_vcpus_pin
cc_compiler            : gcc version 4.6.3 (Debian 4.6.3-4)
cc_compile_by          : waldi
cc_compile_domain      : debian.org
cc_compile_date        : Sun May  6 18:08:50 UTC 2012
xend_config_format     : 4
root@nas-1:/etc# xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  2047     1     r-----    780.4
mogilefs-images.nas-1.lo.ufanet.ru           6   128     1     -b----     27.5

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