Hi List, with vcpus=4 I can choose the number of cpus My virtual machine manager GUI shows: Maximum allocation: 2 Host CPUs: 8 How do I increase the Maximum allocations? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi List, with vcpus=4 I can choose the number of cpus. My virtual machine manager GUI shows: Maximum allocation: 2 Host CPUs: 8 How do I increase the maximum allocations? Best, Mike _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Mike, "vcpus" option set the virtual cpus, not the physical cpus to use. If your server have 8 cpus, they are numbered from 0 to 7. If you want to assign the last 4 physical cpus, you must add to the DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning using "xm vcpu-list" in command line. Is very good practice to manage the cpu assigning, it increases the performance of VMs, and avoid problems when sharing cpus, like freezing because of I/O events. Regards, Diego 2011/8/25 Mike Sievers <saturngeist@googlemail.com>:> Hi List, > > with vcpus=4 I can choose the number of cpus. > > My virtual machine manager GUI shows: > Maximum allocation: 2 > Host CPUs: 8 > > How do I increase the maximum allocations? > > Best, > Mike > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Diego, I wrote in my config: vcpus=4 and I thought that the domU has the performance of 4 cpus. 1nd) xm vcpu-list | grep vm7 vm7 35 0 5 -b- 235.8 1,3,5,7 vm7 35 1 5 -b- 167.9 1,3,5,7 vm7 35 2 7 -b- 88.1 1,3,5,7 vm7 35 3 5 -b- 92.7 1,3,5,7 2nd) with cpus="4-7" xm vcpu-list | grep vm7 vm7 36 0 4 -b- 8.6 4-7 More performance with the 2nd version? Best, Mike 2011/8/25 Diego Dave <diego.dave.s@gmail.com>> Hi Mike, > > "vcpus" option set the virtual cpus, not the physical cpus to use. > > If your server have 8 cpus, they are numbered from 0 to 7. > > If you want to assign the last 4 physical cpus, you must add to the > DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning > using "xm vcpu-list" in command line. > > Is very good practice to manage the cpu assigning, it increases the > performance of VMs, and avoid problems when sharing cpus, like > freezing because of I/O events. > > Regards, > > Diego > > 2011/8/25 Mike Sievers <saturngeist@googlemail.com>: > > Hi List, > > > > with vcpus=4 I can choose the number of cpus. > > > > My virtual machine manager GUI shows: > > Maximum allocation: 2 > > Host CPUs: 8 > > > > How do I increase the maximum allocations? > > > > Best, > > Mike > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Mike, The vcpus option should be together the cpus option, to assign each vcpu to each phy cpu. See one of my cfg files: --------------------------------------------------------------------------------------------------------------------------------------------------------------- import os, re arch = os.uname()[4] if re.search(''64'', arch): arch_libdir = ''lib64'' else: arch_libdir = ''lib'' kernel = "/usr/lib/xen-default/boot/hvmloader" builder=''hvm'' memory = 8192 cpus = ''6-7'' vcpus = 2 shadow_memory = 8 name = "correo" pci = [ ''02:00.0'', ''02:00.1'' ] disk = [ ''file:/home/correo.img,hda,w'' ] boot="dc" vnc = 1 #vncunused=0 sdl = 0 vncconsole=1 vncdisplay=0 #vnclisten=''0.0.0.0'' acpi = 1 apic = 1 device_model = ''/usr/'' + arch_libdir + ''/xen-default/bin/qemu-dm'' stdvga=0 serial=''pty'' usbdevice=''tablet'' on_poweroff = ''destroy'' on_reboot = ''restart'' on_crash = ''restart'' --------------------------------------------------------------------------------------------------------------------------------------------------------------- Regards, Diego 2011/8/26 Mike Sievers <saturngeist@googlemail.com>:> Hi Diego, > > I wrote in my config: vcpus=4 > and I thought that the domU has the performance of 4 cpus. > > 1nd) > xm vcpu-list | grep vm7 > vm7 35 0 5 -b- 235.8 1,3,5,7 > vm7 35 1 5 -b- 167.9 1,3,5,7 > vm7 35 2 7 -b- 88.1 1,3,5,7 > vm7 35 3 5 -b- 92.7 1,3,5,7 > > 2nd) > with cpus="4-7" > > xm vcpu-list | grep vm7 > vm7 36 0 4 -b- 8.6 4-7 > > More performance with the 2nd version? > > Best, > Mike > > 2011/8/25 Diego Dave <diego.dave.s@gmail.com> >> >> Hi Mike, >> >> "vcpus" option set the virtual cpus, not the physical cpus to use. >> >> If your server have 8 cpus, they are numbered from 0 to 7. >> >> If you want to assign the last 4 physical cpus, you must add to the >> DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning >> using "xm vcpu-list" in command line. >> >> Is very good practice to manage the cpu assigning, it increases the >> performance of VMs, and avoid problems when sharing cpus, like >> freezing because of I/O events. >> >> Regards, >> >> Diego >> >> 2011/8/25 Mike Sievers <saturngeist@googlemail.com>: >> > Hi List, >> > >> > with vcpus=4 I can choose the number of cpus. >> > >> > My virtual machine manager GUI shows: >> > Maximum allocation: 2 >> > Host CPUs: 8 >> > >> > How do I increase the maximum allocations? >> > >> > Best, >> > Mike >> > >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com >> > http://lists.xensource.com/xen-users >> > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
OK, thanks. 2011/8/26 Diego Dave <diego.dave.s@gmail.com>> Hi Mike, > > The vcpus option should be together the cpus option, to assign each > vcpu to each phy cpu. > > See one of my cfg files: > > > --------------------------------------------------------------------------------------------------------------------------------------------------------------- > import os, re > arch = os.uname()[4] > if re.search(''64'', arch): > arch_libdir = ''lib64'' > else: > arch_libdir = ''lib'' > > kernel = "/usr/lib/xen-default/boot/hvmloader" > > builder=''hvm'' > > memory = 8192 > > cpus = ''6-7'' > > vcpus = 2 > > shadow_memory = 8 > > name = "correo" > > pci = [ ''02:00.0'', ''02:00.1'' ] > > disk = [ ''file:/home/correo.img,hda,w'' ] > > boot="dc" > > vnc = 1 > #vncunused=0 > sdl = 0 > vncconsole=1 > vncdisplay=0 > #vnclisten=''0.0.0.0'' > acpi = 1 > apic = 1 > device_model = ''/usr/'' + arch_libdir + ''/xen-default/bin/qemu-dm'' > stdvga=0 > serial=''pty'' > > usbdevice=''tablet'' > > on_poweroff = ''destroy'' > on_reboot = ''restart'' > on_crash = ''restart'' > > --------------------------------------------------------------------------------------------------------------------------------------------------------------- > > Regards, > > Diego > > > 2011/8/26 Mike Sievers <saturngeist@googlemail.com>: > > Hi Diego, > > > > I wrote in my config: vcpus=4 > > and I thought that the domU has the performance of 4 cpus. > > > > 1nd) > > xm vcpu-list | grep vm7 > > vm7 35 0 5 -b- 235.8 1,3,5,7 > > vm7 35 1 5 -b- 167.9 1,3,5,7 > > vm7 35 2 7 -b- 88.1 1,3,5,7 > > vm7 35 3 5 -b- 92.7 1,3,5,7 > > > > 2nd) > > with cpus="4-7" > > > > xm vcpu-list | grep vm7 > > vm7 36 0 4 -b- 8.6 4-7 > > > > More performance with the 2nd version? > > > > Best, > > Mike > > > > 2011/8/25 Diego Dave <diego.dave.s@gmail.com> > >> > >> Hi Mike, > >> > >> "vcpus" option set the virtual cpus, not the physical cpus to use. > >> > >> If your server have 8 cpus, they are numbered from 0 to 7. > >> > >> If you want to assign the last 4 physical cpus, you must add to the > >> DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning > >> using "xm vcpu-list" in command line. > >> > >> Is very good practice to manage the cpu assigning, it increases the > >> performance of VMs, and avoid problems when sharing cpus, like > >> freezing because of I/O events. > >> > >> Regards, > >> > >> Diego > >> > >> 2011/8/25 Mike Sievers <saturngeist@googlemail.com>: > >> > Hi List, > >> > > >> > with vcpus=4 I can choose the number of cpus. > >> > > >> > My virtual machine manager GUI shows: > >> > Maximum allocation: 2 > >> > Host CPUs: 8 > >> > > >> > How do I increase the maximum allocations? > >> > > >> > Best, > >> > Mike > >> > > >> > _______________________________________________ > >> > Xen-users mailing list > >> > Xen-users@lists.xensource.com > >> > http://lists.xensource.com/xen-users > >> > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users