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vt: Use textmode when we're running on hypervisors

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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
This commit is contained in:
sephe 2016-03-28 07:36:54 +00:00
parent 2b800612da
commit aa300db87e
1 changed files with 7 additions and 1 deletions
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8
sys/dev/vt/hw/vga/vt_vga.c
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@ -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;