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>:
> On Wed, Jun 13, 2012 at 2:59 PM, ÐÑÑÐÐÐ ÐÐÑÐÐÐÐ <ufaweb@xxxxxxxxx> wrote:
>> 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
>

> - how large is your test size, relative to dom0 memory
test size = 2 GByte, memory in dom0 = 2GByte

> - is the test I/O random or sequential
sequential

> - does the test use sync/direct I/O
direct

> - which fs was used
ext4

> - how well does the fs handle the underlying storage "lying" about
> sync completion
not understood

>
>> and how this problem can be solved?
>
> Don't use file:/
ok, it remains only to solve the problem of slow speed when using phy:/ :)

-- 
Ð ÑÐÐÐÐÐÐÐÐ, ÐÐÑÐÐÐÐ ÐÑÑÐÐÐ.
ÐÑÐÐÐÐÐÐÑÐÐÑ ÐÑÐÐÐÐ ÑÐÐÑÐÐÐÑÐÐ Ð ÑÐÐÑÐÐÐÐÐÐÐÐÑ ÐÑÐÐÑÐÐÐÐÐÐÐ
ÐÐÐÑÐÐÑÐÐÐÑ ÐÐÐ "ÐÑÐÐÐÑ".

ÐÐÐÑÐÐÑÐÐÑ ÐÐÑÐÑÐÐÑÐÑ:
google+: http://gplus.to/ruslan
jid: serafim@xxxxxxxxxxxxxxxx
wave: ufaweb@xxxxxxxxxxxxxx
skype: ufaweb
phone: +7(917)4775460
vkontakte: http://vkontakte.ru/ufaweb
myspace: http://www.myspace.com/ufaweb
facebook: http://facebook.com/sharipov
linkedin: http://www.linkedin.com/in/ufaweb
twitter: http://twitter.com/ufaweb

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users