我有一个CentOS KVM服务器运行1个OpenBSD，1个CentOS和2个FreeBSD客户端。
只有openBSD客户端在KVM服务器上的CPU负载较高。 在服务器上8-10％，而客户处于闲置状态。
我在客人上运行的唯一服务是pfctl。 如果我禁用这个CPU负载保持不变。
KVM主机/ openBSd客户机可以对性能进行任何调整，以改善这一点。
与其他硬件唯一的硬件区别在于OpenBSD guest有一个PassThru PCI NIC。 我已经禁用了这个testing，Cpu负载在8-10％。
我经历了很多虚拟pipe理器的设置，即设置磁盘到VirtIO，显示到VGA /无等，CPU设置。 也许我缺less一个设置，因为我是新的qemu-kvm / libvirt？
ps输出OpenBSD guest。
ps aux |grep 26303 qemu 26303 10.0 10.1 1538672 1219800 ? SLl 09:12 2:32 /usr/libexec/qemu-kvm -name skips -S -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu Haswell,-rtm,-hle -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 0520a68a-de40-4187-8a9f-d1e05dc83255 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-skips/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive if=none,id=drive-ide0-0-1,readonly=on,format=raw -device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -drive file=/var/lib/libvirt/images/skips.qcow2,if=none,id=drive-ide0-1-0,format=qcow2 -device ide-hd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev tap,fd=23,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:59:fd:17,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -spice port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on -vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 -global qxl-vga.vgamem_mb=16 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1 -device vfio-pci,host=03:00.0,id=hostdev0,bus=pci.0,addr=0x8 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on root 26309 0.0 0.0 0 0 ? S 09:12 0:00 [kvm-pit/26303] root 27346 0.0 0.0 112644 960 pts/4 S+ 09:37 0:00 grep --color=auto 26303 CENTOS KVM主机输出：
top - 08:59:25 up 1 day, 13:12, 2 users, load average: 0.11, 0.10, 0.10 Tasks: 145 total, 1 running, 144 sleeping, 0 stopped, 0 zombie top - 09:05:53 up 1 day, 13:18, 2 users, load average: 0.02, 0.06, 0.08 Tasks: 143 total, 2 running, 141 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.2 us, 0.9 sy, 0.0 ni, 97.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 11995120 total, 246888 free, 4868624 used, 6879608 buff/cache KiB Swap: 6094844 total, 6083828 free, 11016 used. 6806152 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 26303 qemu 20 0 1537648 1.174g 11728 S 8.3 10.3 1:48.18 qemu-kvm 28147 qemu 20 0 1746032 1.084g 11672 S 1.3 9.5 18:33.98 qemu-kvm 2759 qemu 20 0 1646104 1.124g 11840 S 1.0 9.8 20:18.35 qemu-kvm 15927 qemu 20 0 1694228 1.052g 11632 S 0.7 9.2 25:24.74 qemu-kvm
OpenBSD客户端输出：
load averages: 0.09, 0.09, 0.08 26 processes: 25 idle, 1 on processor CPU states: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle Memory: Real: 18M/62M act/tot Free: 920M Cache: 17M Swap: 0K/1264M
dmesg：（注意：将内存从1024降低到了256MB）
OpenBSD 5.8 (GENERIC) #1170: Sun Aug 16 02:26:00 MDT 2015 deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC real mem = 251650048 (239MB) avail mem = 240300032 (229MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xf1e70 (10 entries) bios0: vendor Seabios version "0.5.1" date 01/01/2011 bios0: Red Hat KVM acpi0 at bios0: rev 0 acpi0: sleep states S5 acpi0: tables DSDT FACP SSDT APIC 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) cpu0: Intel Core Processor (Haswell), 3292.72 MHz cpu0: FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,HV,NXE,LONG,LAHF,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 1000MHz ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins acpiprt0 at acpi0: bus 0 (PCI0) acpicpu0 at acpi0: C1(@1 halt!) pvbus0 at mainbus0: KVM pci0 at mainbus0 bus 0 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 atapiscsi0 at pciide0 channel 0 drive 1 scsibus1 at atapiscsi0: 2 targets cd0 at scsibus1 targ 0 lun 0: <QEMU, QEMU DVD-ROM, 1.5.> ATAPI 5/cdrom removable cd0(pciide0:0:1): using PIO mode 4, DMA mode 2 wd0 at pciide0 channel 1 drive 0: <QEMU HARDDISK> wd0: 16-sector PIO, LBA48, 20480MB, 41943040 sectors wd0(pciide0:1:0): using PIO mode 4, DMA mode 2 piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9 iic0 at piixpm0 iic0: addr 0x18 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x1a 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x29 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x2b 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x4c 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x4e 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 vga1 at pci0 dev 2 function 0 "Red Hat QXL Video" rev 0x04 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) re0 at pci0 dev 3 function 0 "Realtek 8139" rev 0x20: RTL8139C+ (0x7480), apic 0 int 11, address 52:54:00:59:fd:17 rlphy0 at re0 phy 0: RTL internal PHY azalia0 at pci0 dev 4 function 0 "Intel 82801FB HD Audio" rev 0x01: apic 0 int 11 azalia0: No codecs found virtio0 at pci0 dev 5 function 0 "Qumranet Virtio Console" rev 0x00: Virtio Console Device virtio0: no matching child driver; not configured uhci0 at pci0 dev 6 function 0 "Intel 82801I USB" rev 0x03: apic 0 int 10 uhci1 at pci0 dev 6 function 1 "Intel 82801I USB" rev 0x03: apic 0 int 11 uhci2 at pci0 dev 6 function 2 "Intel 82801I USB" rev 0x03: apic 0 int 11 ehci0 at pci0 dev 6 function 7 "Intel 82801I USB" rev 0x03: apic 0 int 10 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 virtio1 at pci0 dev 7 function 0 "Qumranet Virtio Memory" rev 0x00: Virtio Memory Balloon Device viomb0 at virtio1 virtio1: apic 0 int 11 re1 at pci0 dev 8 function 0 "Realtek 8169" rev 0x10: RTL8169/8110SB (0x1000), apic 0 int 11, address 60:e3:27:03:9f:80 rgephy0 at re1 phy 7: RTL8169S/8110S/8211 PHY, rev. 3 isa0 at pcib0 isadma0 at isa0 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 1: density unknown com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "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 wd0a (92a6f3df5ed1df79.a) swap on wd0b dump on wd0b clock: unknown CMOS layout
SYSTAT
1 users Load 0.11 0.12 0.08 Tue Feb 23 23:26:40 2016 memory totals (in KB) PAGING SWAPPING Interrupts real virtual free in out in out 278 total Active 19208 19208 174948 ops 100 clock All 67940 67940 1469272 pages pciide0 110 re0 Proc:rdsw Csw Trp Sys Int Sof Flt forks 68 re1 3 223 1 42 180 222 7 fkppw fksvm 0.8%Int 0.2%Sys 0.0%Usr 0.0%Nic 99.0%Idle pwait | | | | | | | | | | | relck rlkok noram Namei Sys-cache Proc-cache No-cache ndcpy Calls hits % hits % miss % fltcp zfod cow Disks cd0 wd0 fd0 2024 fmin seeks 2698 ftarg xfers itarg speed 1 wired sec pdfre pdscn pzidle 13 kmapent
uname -a（来自centos 7 1511）
Linux benson 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
uname -a（来自freebsd 10.2）
10.2-RELEASE FreeBSD 10.2-RELEASE #0 r286666: Wed Aug 12 15:26:37 UTC 2015 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64
欣赏任何提示，
菲利普
更新：我检查了很多的选项，并不能得到CPU水平。 在进一步的说明中，我正在运行一个在xen下的openBSD实例，我没有遇到高层次的问题。