On Mon, Jun 16, 2014 at 11:07:39PM +0100, Kevin Chadwick wrote:
> previously on this list Mikolaj Kucharski contributed:
>
> > by disabling mpbios on
> > > OpenBSD and falling back to the old pic controller, in this case you
> > >
> >
> > I cannot find how to enable 'the old pic controller' in libvirt with
> > qemu-kvm. Do you know by any chance how to enable it?
>
> I believe he means disabling mpbios at OpenBSD's boot or in boot.conf
> means KVM will automatically fall back. Virtual hosting companies like
> arpnetworks generally ask you to do this for OpenBSD.
>
> boot -c
> disable mpbios
Ah, I got confused. Yes, I'm aware of this, as I've seen this on the
list archives mentioned few times. I actually tested this, and I don't
see any difference. See at my below tests:
#### OpenBSD i386/virtio (default) [test12] ####
# time dd if=/dev/zero of=/tmp/TEST bs=4096 count=1024x1024
1048576+0 records in
1048576+0 records out
4294967296 bytes transferred in 3635.270 secs (1181471 bytes/sec)
60m35.50s real 0m1.24s user 54m15.15s system
#### OpenBSD i386/virtio (disable mpbios) [test13] ####
# time dd if=/dev/zero of=/tmp/TEST bs=4096 count=1024x1024
1048576+0 records in
1048576+0 records out
4294967296 bytes transferred in 3628.306 secs (1183739 bytes/sec)
60m28.49s real 0m1.33s user 54m8.30s system
On the archives I have seen recommendation to disable mpbios while
machine is slow in general, however I am experiencing only slow disk
I/O. I thought my problem is unrelated to mpbios.
With qemu-kvm from RHEL7 on bsd.sp there is no mpbios mentioned in
dmesg(8) (I didn't test bsd.mp). See dmesg output at the bottom of this
email. Also starting OpenBSD with mpbios disabled via boot_config(8)
ends up with:
--- dmesg.txt Sat Jun 14 15:49:02 2014
+++ disable-mpbios.txt Tue Jun 17 08:15:34 2014
@@ -4,6 +4,11 @@
cpu0:
FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,NXE,LONG,SSE3,CX16,LAHF,ABM,SSE4A,PERF
real mem = 536367104 (511MB)
avail mem = 515158016 (491MB)
+User Kernel Config
+UKC> disable mpbios
+368 mpbios0 disabled
+UKC> quit
+Continuing...
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
@@ -22,7 +27,7 @@
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0
-bios0: ROM list: 0xc0000/0x1000! 0xc1000/0xa00 0xc2000/0x2400 0xed800/0x2800!
+bios0: ROM list: 0xc0000/0x1000! 0xc1000/0xa00 0xc2000/0x2400 0xed800/0x2800
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
@@ -32,11 +37,11 @@
uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9
iic0 at piixpm0
-iic0: addr 0x1c 0f=00 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87
06=9d87 07=9d87
-iic0: addr 0x1d 0f=00 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87
06=9d87 07=9d87
-iic0: addr 0x4c 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words
00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87 06=9d87 07=9d87
-iic0: addr 0x4d 3e=d1 48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=9d87 01=9d87
02=9d87 03=9d87 04=9d87 05=9d87 06=9d87 07=9d87
-iic0: addr 0x4e 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 3e=d1
48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87
05=9d87 06=9d87 07=9d87
+iic0: addr 0x1c 0f=00 words 00=8fc5 01=8fc5 02=8fc5 03=8fc5 04=8fc5 05=8fc5
06=8fc5 07=8fc5
+iic0: addr 0x1d 0f=00 words 00=8fc5 01=8fc5 02=8fc5 03=8fc5 04=8fc5 05=8fc5
06=8fc5 07=8fc5
+iic0: addr 0x4c 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words
00=8fc5 01=8fc5 02=8fc5 03=8fc5 04=8fc5 05=8fc5 06=8fc5 07=8fc5
+iic0: addr 0x4d 3e=d1 48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=8fc5 01=8fc5
02=8fc5 03=8fc5 04=8fc5 05=8fc5 06=8fc5 07=8fc5
+iic0: addr 0x4e 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 3e=d1
48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=8fc5 01=8fc5 02=8fc5 03=8fc5 04=8fc5
05=8fc5 06=8fc5 07=8fc5
virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Network" rev 0x00: Virtio
Network Device
vio0 at virtio0: address 52:54:00:12:34:70
virtio0: apic 0 int 11
Full, default dmesg:
OpenBSD 5.5-current (GENERIC) #162: Tue Jun 10 21:17:31 MDT 2014
dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: QEMU Virtual CPU version 1.5.3 ("AuthenticAMD" 686-class, 512KB L2 cache)
2.61 GHz
cpu0:
FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,NXE,LONG,SSE3,CX16,LAHF,ABM,SSE4A,PERF
real mem = 536367104 (511MB)
avail mem = 515158016 (491MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 06/23/99, BIOS32 rev. 0 @ 0xfc672, SMBIOS
rev. 2.4 @ 0xfdde0 (10 entries)
bios0: vendor Bochs version "Bochs" date 01/01/2011
bios0: Red Hat KVM
acpi0 at bios0: rev 0
acpi0: sleep states S5
acpi0: tables DSDT FACP SSDT APIC RSDT
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 999MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0
bios0: ROM list: 0xc0000/0x1000! 0xc1000/0xa00 0xc2000/0x2400 0xed800/0x2800!
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0
wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 disabled (no drives)
pciide0: channel 1 disabled (no drives)
uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9
iic0 at piixpm0
iic0: addr 0x1c 0f=00 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87
06=9d87 07=9d87
iic0: addr 0x1d 0f=00 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87
06=9d87 07=9d87
iic0: addr 0x4c 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words
00=9d87 01=9d87 02=9d87 03=9d87 04=9d87 05=9d87 06=9d87 07=9d87
iic0: addr 0x4d 3e=d1 48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=9d87 01=9d87
02=9d87 03=9d87 04=9d87 05=9d87 06=9d87 07=9d87
iic0: addr 0x4e 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 3e=d1
48=d1 4a=d1 4e=d1 fc=d1 fe=d1 words 00=9d87 01=9d87 02=9d87 03=9d87 04=9d87
05=9d87 06=9d87 07=9d87
virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Network" rev 0x00: Virtio
Network Device
vio0 at virtio0: address 52:54:00:12:34:70
virtio0: apic 0 int 11
virtio1 at pci0 dev 4 function 0 "Qumranet Virtio Storage" rev 0x00: Virtio
Block Device
vioblk0 at virtio1
scsibus1 at vioblk0: 2 targets
sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, > SCSI3 0/direct fixed
sd0: 102400MB, 512 bytes/sector, 209715200 sectors
virtio1: apic 0 int 11
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcdisplay0 at isa0 port 0x3d0/16 iomem 0xb8000/32768
wsdisplay0 at pcdisplay0 mux 1: console (80x25, vt100 emulation), using wskbd0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 1: density unknown
usb0 at uhci0: USB revision 1.0
uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
nvram: invalid checksum
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (fcfbf65f39872058.a) swap on sd0b dump on sd0b
clock: unknown CMOS layout
--
best regards
q#
