Date: Mon, 16 Mar 2015 23:43:27 +0100 From: Willem Jan Withagen <wjw@digiware.nl> To: Alexander Motin <mav@FreeBSD.org>, Bryan Venteicher <bryanv@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r280154 - head/usr.sbin/bhyve Message-ID: <55075C8F.70001@digiware.nl> In-Reply-To: <550749FE.5000901@FreeBSD.org> References: <201503162013.t2GKDQFr009617@svn.freebsd.org> <CAGaYwLcA7t64Z%2B%2BGynBHer%2BT1%2BBHqx5o41juUnh0dKNe-VhfpA@mail.gmail.com> <550749FE.5000901@FreeBSD.org>
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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@freebsd.org >> <mailto:mav@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
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