On Fri, Nov 03, 2017 at 09:10:45AM +, Dr. David Alan Gilbert wrote:
> * Paul Schlacter (wlfigh...@gmail.com) wrote:
> > latest progress：
> > use centos 7.2 https://cloud.centos.org/centos/7/images/
> > test version: 1511 1601 1604 1606 1608
> >
> > From the above version in turn test, foun
* Paul Schlacter (wlfigh...@gmail.com) wrote:
> latest progress：
> use centos 7.2 https://cloud.centos.org/centos/7/images/
> test version: 1511 1601 1604 1606 1608
>
> From the above version in turn test, found the previous version 1511 1601
> 1603 have the problem,
> The latter two versions
latest progress：
use centos 7.2 https://cloud.centos.org/centos/7/images/
test version: 1511 1601 1604 1606 1608
>From the above version in turn test, found the previous version 1511 1601
1603 have the problem,
The latter two versions 1606 1608 are normal, dont't have the prblem,
Normal is cac
Hi David:
yes, with the same qemu, centos 7.2 guest cache is writeback and
none, the disk io almost, writeback feeling no effect.
but 7.1/7.3/7.4 cache is writeback was significantly faster than
none model
On Wed, Nov 1, 2017 at 8:02 PM, Paul Schlacter wrote:
> Hi David:
> yes,
* Paul Schlacter (wlfigh...@gmail.com) wrote:
> qemu version: 2.9.0
> image: centos 7.2 1511 raw
> cache mode: writeback
>
>
> In centos7.2 time, the use of writeback and none, the result of dd disk is
> the same io, no change
>
> But I replaced centos7.1 centos7.3 centos7.4 when writeback was
qemu version: 2.9.0
image: centos 7.2 1511 raw
cache mode: writeback
In centos7.2 time, the use of writeback and none, the result of dd disk is
the same io, no change
But I replaced centos7.1 centos7.3 centos7.4 when writeback was
significantly faster than none
Would like to ask what is going
