qemu-kvm绑定cpu的核上

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原创最新推荐文章于 2026-08-17 16:04:26 发布 3.2k 阅读 AI 写同款· GEO 优化 ›

使用qemu-kvm建立一个虚拟机，然后虚拟机的线程绑定到具体的一个cpu的核上
环境，centos6.5，双核，

1,在主机上修改grub,把主机的核隔离
2.使用taskset 把qemu的线程绑定到隔离的核上。


yum install glib2 glib2-devel libtool gcc-c++ gcc zlib zlib-devel flex bison
lsmod |grep kvm
ls -l /dev/kvm

打开vmware或者bios的cpu的VT
kvm在/usr/libexec/qemu-kvm

新建一个硬盘

dd if=/dev/zero of=rhel65.img bs=1M count=8192

第一次使用iso新建系统

/usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd  -hda /root/kvm/rhel65.img -cdrom /root/kvm/CentOS-6.5-x86_64.iso

第二次就不用iso了

/usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd  -hda /root/kvm/rhel65.img  -vnc 192.168.137.188:1 &

如果模拟具体某种cpu

/usr/libexec/qemu-kvm -cpu SandyBridge -m 2048 -smp 2 -boot order=cd  -hda /root/kvm/rhel65.img  -vnc 192.168.137.188:1 -daemonize

看支持的cpu

/usr/libexec/qemu-kvm -cpu ?

启动之后用vnc连上去
ctrl+alt+2 切换到qemu
info cpus
info kvm
[img]http://dl2.iteye.com/upload/attachment/0109/8611/c1571c24-9b4a-3208-b4f6-4332e63ec74f.jpg[/img]
修改grup，然后重启主机，
[code="java"]
# cat /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/sda2
# initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32-431.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=89c4d858-c966-44b9-b2a8-df121e83cb78 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet isolcpus=1
initrd /initramfs-2.6.32-431.el6.x86_64.img
[/code]
把 isolcpus=1 把第二个核隔离，
重启之后
[code="java"]
# ps -eLo psr|grep 0|wc -l
351
#
#
# ps -eLo psr|grep 1|wc -l
35
#
[/code]
看出差别
第二个核上的线程数很少，只有linux基本的
[code="java"]
# ps -eLo ruser,pid,ppid,lwp,psr,args |awk '{if($5==1) print $0}'
root 2 0 2 1 [kthreadd]
root 7 2 7 1 [migration/1]
root 8 2 8 1 [migration/1]
root 9 2 9 1 [ksoftirqd/1]
root 10 2 10 1 [watchdog/1]
root 12 2 12 1 [events/1]
root 13 2 13 1 [cgroup]
root 14 2 14 1 [khelper]
root 15 2 15 1 [netns]
root 19 2 19 1 [bdi-default]
root 21 2 21 1 [kintegrityd/1]
root 23 2 23 1 [kblockd/1]
root 29 2 29 1 [ata_sff/1]
root 31 2 31 1 [khubd]
root 34 2 34 1 [md/1]
root 36 2 36 1 [md_misc/1]
root 38 2 38 1 [khungtaskd]
root 43 2 43 1 [aio/1]
root 45 2 45 1 [crypto/1]
root 51 2 51 1 [kthrotld/1]
root 164 2 164 1 [mpt_poll_0]
root 844 2 844 1 [vmmemctl]
root 990 2 990 1 [xfslogd/1]
root 992 2 992 1 [xfsdatad/1]
root 994 2 994 1 [xfsconvertd/1]
root 996 2 996 1 [xfsalloc/1]
root 998 2 998 1 [xfseofblocks/1]
root 1000 2 1000 1 [xfssyncd/dm-1]
root 1054 2 1054 1 [kauditd]
[/code]
看qemu的进程绑定到哪个cpu
[code="java"]
# ps -eLo ruser,pid,ppid,lwp,psr,args |grep qemu|grep -v grep
root 29518 4956 29518 0 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29524 0 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29525 0 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29842 0 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
#
[/code]
注意第五列，都是0

把id绑定到1的核上
注意，第一个核实0x1 第二个是0x2，第三个是0x4，第四个是0x8
[code="java"]
# taskset -p 0x2 29524
pid 29524's current affinity mask: 1
pid 29524's new affinity mask: 2
#
#
# taskset -p 0x2 29525
pid 29525's current affinity mask: 1
pid 29525's new affinity mask: 2
#
#
# ps -eLo ruser,pid,ppid,lwp,psr,args |grep qemu|grep -v grep
root 29518 4956 29518 1 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29524 1 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29525 1 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
root 29518 4956 29862 1 /usr/libexec/qemu-kvm -m 2048 -smp 2 -boot order=cd -hda /root/kvm/rhel65.img -vnc 192.168.137.188:1
#
[/code]
发现第五列的核的编号都变成1了
ps -eLo ruser,pid,ppid,lwp,psr,args |awk '{if($5==1) print $0}'
再对比一下，第二个核上，除了linux基本的进程，多qemu相关的进程
除了开始的基本的linux进程，又多了这几个qemu的进程
实现了，把qemu绑定到特殊的核上，进行了qemu独享某个核，资源的合理分配和高校利用

cpu的其他相关的


/usr/libexec/qemu-kvm -m 2048 -smp 8,sockets=2,cores=2,threads=2  -hda /root/kvm/rhel65.img  -vnc 192.168.137.188:1 
（1）socket就是主板上插cpu的槽的数目，也即管理员说的"路"
（2）core就是我们平时说的”核“，即双核，4核等
（3）thread就是每个core的硬件线程数，即超线程
http://labs.chinamobile.com/mblog/854855_199265

其他的调用


/usr/libexec/qemu-kvm -name http1 -S -M rhel6.5.0 -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 0e4189c4-4006-6ee7-d1e5-fa03c8cf0130 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/http1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/opt/zhangjl/pacemaker/http1.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=26 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:8f:ab:fd,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 0.0.0.0:4109 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

qemu-system-x86_64 -name http1 -S -machine rhel6.5.0 -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 0e4189c4-4006-6ee7-d1e5-fa03c8cf0130 -nodefconfig -nodefaults -chardev socket,id=charmonitor -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=cirros-0.3.1-x86_64-disk.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=26 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:8f:ab:fd,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 0.0.0.0:4109 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

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