Re: [Xen-users] domU sync I/O

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

El 02/11/15 a les 14.45, Simone Ricci ha escrit:
> Il giorno 02 nov 2015, alle ore 14:29, Roger Pau Monnà <roger.pau@xxxxxxxxxx> 
> ha scritto:
>>
>>>
>>> - tapblk3 drops sync cache commands from the guest
>>
>> I cannot speak about tapdisk3, that's not part of the Xen Project source
>> code. Have you tried to ask on the xs-devel list?
>>
>> https://lists.xenserver.org/sympa/subscribe/xs-devel
> 
> No Iâve not, Iâm doing it now. Many thanks to pointing that out.
>
>>
>>> - xen_blkfront into the domU ignores sync I/O semantics
>>
>> xen-blkfront in Linux has support for flush since quite some time, can
>> you tell us which OS and version are you using in the guest?
> 
> Debian wheezy:
> 
> root@test:~# lsb_release -a
> No LSB modules are available.
> Distributor ID:       Debian
> Description:  Debian GNU/Linux 7.9 (wheezy)
> Release:      7.9
> Codename:     wheezy
> root@test:~# uname -a
> Linux test 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u4 x86_64 GNU/Linux

FWIW, I've just checked the sources and your kernel blkfront driver
should support flush without problems.

Roger.


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