On Tue, Jun 17, 2014 at 07:47:32PM +0100, Mikolaj Kucharski wrote: > Mike, > > On Tue, Jun 17, 2014 at 10:30:23AM -0700, Mike Larkin wrote: > > On Tue, Jun 17, 2014 at 05:10:51AM -0400, Brad Smith wrote: > > > Because ACPI is in use which takes higher precedence over MP BIOS. You > > > have to disable acpimadt. > > > > > > > Randomly disabling parts of the kernel is likely to cause other problems. > > > > I agree, but disabling mpbios and acpimadt makes a huge difference for me > on qemu-kvm-1.5.3-60.el7.x86_64: >
Please don't bother filing any bug reports for a system where you've done this. -ml > > #### OpenBSD i386/virtio (bsd.sp disable mpbios and acpimadt) #### > > # time dd if=/dev/zero of=/tmp/TEST bs=4096 count=1024x1024 > 1048576+0 records in > 1048576+0 records out > 4294967296 bytes transferred in 18.524 secs (231854084 bytes/sec) > 0m18.52s real 0m0.24s user 0m14.48s system > > > It takes now 18 seconds to run above dd(1), when previously it took 60 > mintues. Thanks Christiano and Brad for the tips. > > > Do you guys think it's worth opening bug report with RedHat to get them > look into this, or is the problem more on OpenBSD side? Ideally I would > like to run unmodified OpenBSD kernel on my VMs. > > > $ diff -I'^iic0' dmesg.txt disable-mpbios-and-acpimadt.txt > --- dmesg.txt Sat Jun 14 15:49:02 2014 > +++ disable-mpbios-and-acpimadt.txt Tue Jun 17 13:30:46 2014 > @@ -4,6 +4,13 @@ > 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> disable acpimadt > +501 acpimadt0 disabled > +UKC> quit > +Continuing... > mpath0 at root > scsibus0 at mpath0: 256 targets > mainbus0 at root > @@ -15,22 +22,20 @@ > 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 > +mpbios at bios0 function 0x0 not configured > bios0: ROM list: 0xc0000/0x1000! 0xc1000/0xa00 0xc2000/0x2400 0xed800/0x2800! > +cpu0 at mainbus0: (uniprocessor) > +mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges > 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 > +uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: irq 11 > +piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: irq 9 > iic0 at piixpm0 > iic0: addr 0x1c 0f=00 words 00=d4d0 01=d4d0 02=d4d0 03=d4d0 04=d4d0 05=d4d0 > 06=d4d0 07=d4d0 > iic0: addr 0x1d 0f=00 words 00=d4d0 01=d4d0 02=d4d0 03=d4d0 04=d4d0 05=d4d0 > 06=d4d0 07=d4d0 > @@ -39,13 +44,13 @@ > 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 > +virtio0: irq 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 > +virtio1: irq 11 > isa0 at pcib0 > isadma0 at isa0 > com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo > > > -- > best regards > q#
