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[Qemu-devel] vga slow with -enable-kvm
From: |
Gerd Hoffmann |
Subject: |
[Qemu-devel] vga slow with -enable-kvm |
Date: |
Fri, 07 Nov 2008 10:18:33 +0100 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080723) |
Hi,
The vga display is very slow when using latest svn with kvm enabled.
Just try to boot any linux kernel with vesafb enabled (vga=0x314 for
address@hidden), enjoy watching the boot messages scroll. Booting without
kvm enabled is *faster*.
Feels like every single screen access is trapped or something like that.
kvm_stat confirms that, there are tons of mmio exits:
address@hidden ~]# kvm_stat -1
efer_reload 0 0
exits 98234706 132054
fpu_reload 6330433 0
halt_exits 104372 0
halt_wakeup 0 0
host_state_reload 96499874 132038
hypercalls 0 0
insn_emulation 94632076 129954
insn_emulation_fail 0 0
invlpg 0 0
io_exits 2627489 1653
irq_exits 239675 397
irq_window 11138 14
largepages 0 0
mmio_exits 93583132 129946
mmu_cache_miss 38079 0
mmu_flooded 37708 0
mmu_pde_zapped 35810 0
mmu_pte_updated 588299 0
mmu_pte_write 647324 0
mmu_recycled 0 0
mmu_shadow_zapped 48191 0
pf_fixed 1211070 1
pf_guest 109462 0
remote_tlb_flush 0 0
request_irq 0 0
signal_exits 164181 402
tlb_flush 728218 44
cheers,
Gerd
- [Qemu-devel] vga slow with -enable-kvm,
Gerd Hoffmann <=