Date: Thu, 16 Jun 2016 04:32:11 +0000 (UTC) From: Sepherosa Ziehau <sephe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r301950 - stable/10/sys/dev/vt/hw/vga Message-ID: <201606160432.u5G4WB31080497@repo.freebsd.org>
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Author: sephe Date: Thu Jun 16 04:32:11 2016 New Revision: 301950 URL: https://svnweb.freebsd.org/changeset/base/301950 Log: MFC 297334 vt: Use textmode when we're running on hypervisors The graphic mode is noticeably slow on hypervisors, especially on Hyper-V (1 second to each line). Submitted by: Dexuan Cui <decui microsoft com> Reviewed by: kib, sephe, royger (early loader version) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5739 Modified: stable/10/sys/dev/vt/hw/vga/vt_vga.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/vt/hw/vga/vt_vga.c ============================================================================== --- stable/10/sys/dev/vt/hw/vga/vt_vga.c Thu Jun 16 04:21:27 2016 (r301949) +++ stable/10/sys/dev/vt/hw/vga/vt_vga.c Thu Jun 16 04:32:11 2016 (r301950) @@ -1200,7 +1200,6 @@ vga_init(struct vt_device *vd) if (vd->vd_softc == NULL) vd->vd_softc = (void *)&vga_conssoftc; sc = vd->vd_softc; - textmode = 0; #if defined(__amd64__) || defined(__i386__) sc->vga_fb_tag = X86_BUS_SPACE_MEM; @@ -1217,6 +1216,13 @@ vga_init(struct vt_device *vd) bus_space_map(sc->vga_reg_tag, VGA_REG_BASE, VGA_REG_SIZE, 0, &sc->vga_reg_handle); + /* + * If "hw.vga.textmode" is not set and we're running on hypervisor, + * we use text mode by default, this is because when we're on + * hypervisor, vt(4) is usually much slower in graphics mode than + * in text mode, especially when we're on Hyper-V. + */ + textmode = vm_guest != VM_GUEST_NO; TUNABLE_INT_FETCH("hw.vga.textmode", &textmode); if (textmode) { vd->vd_flags |= VDF_TEXTMODE;
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