Date: Mon, 16 Mar 2015 23:24:14 +0200 From: Alexander Motin <mav@FreeBSD.org> To: 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: <550749FE.5000901@FreeBSD.org> In-Reply-To: <CAGaYwLcA7t64Z%2B%2BGynBHer%2BT1%2BBHqx5o41juUnh0dKNe-VhfpA@mail.gmail.com> References: <201503162013.t2GKDQFr009617@svn.freebsd.org> <CAGaYwLcA7t64Z%2B%2BGynBHer%2BT1%2BBHqx5o41juUnh0dKNe-VhfpA@mail.gmail.com>
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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. -- Alexander Motin
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