svn commit: r280154 - head/usr.sbin/bhyve

[Willem Jan Withagen]

On 16-3-2015 22:24, Alexander Motin wrote:
> On 16.03.2015 23:13, Bryan Venteicher wrote:
>> On Mon, Mar 16, 2015 at 3:13 PM, Alexander Motin <mav at freebsd.org
>> <mailto:mav at freebsd.org>> wrote:
>>     Author: mav
>>     Date: Mon Mar 16 20:13:25 2015
>>     New Revision: 280154
>>     URL: https://svnweb.freebsd.org/changeset/base/280154
>>
>>     Log:
>>       Report that we may have write cache, and that we do support FLUSH.
>>
>>       FreeBSD guest driver does not use that legacy flag, but Linux
>>     seems does.
>>
>> The guest driver calls it by a prior name: VIRTIO_BLK_F_WCE. The write
>> cache stuff went through several iterations, and goes away in VirtIO 1.0
>> specification.
> 
> Yes, I've found that in the driver after the commit. But as I can see
> driver does nothing about it, except reporting via sysctl. I was
> confused by not seeing any use of that flag in data path.
> 

There was a point in time that this Flush was in the way of booting
certain Linux versions. I guess that accepting, but ignoring, which what
I did at a certain point in my code, got me going. Until extra code made
it in the code and the command got us further with our progress in Bhyve.

--WjW