diff options
| author | sephe <sephe@FreeBSD.org> | 2016-03-28 07:36:54 +0000 |
|---|---|---|
| committer | sephe <sephe@FreeBSD.org> | 2016-03-28 07:36:54 +0000 |
| commit | aa300db87e32eb4497657225750a8692d1116175 (patch) | |
| tree | 8e688bc1feef21b92bf2b101082b0abc833dec63 /sys/dev/vt | |
| parent | 2b800612daf9f1e49be89fbebf8432f23f01cbc4 (diff) | |
| download | FreeBSD-src-aa300db87e32eb4497657225750a8692d1116175.zip FreeBSD-src-aa300db87e32eb4497657225750a8692d1116175.tar.gz | |
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
Diffstat (limited to 'sys/dev/vt')
| -rw-r--r-- | sys/dev/vt/hw/vga/vt_vga.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/dev/vt/hw/vga/vt_vga.c b/sys/dev/vt/hw/vga/vt_vga.c index 4661f35..62c9bf3 100644 --- a/sys/dev/vt/hw/vga/vt_vga.c +++ b/sys/dev/vt/hw/vga/vt_vga.c @@ -1214,7 +1214,6 @@ vga_init(struct vt_device *vd) if (vd->vd_softc == NULL) vd->vd_softc = (void *)&vga_conssoftc; sc = vd->vd_softc; - textmode = 0; if (vd->vd_flags & VDF_DOWNGRADE && vd->vd_video_dev != NULL) vga_pci_repost(vd->vd_video_dev); @@ -1229,6 +1228,13 @@ 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; |
