search for: dom0_max_vcpus

Hi experts, Q1:What''s the different for "dom0_max_vcpus=4 dom0_vcpus_pin" and "dom0_max_vcpus=4" ? which will get better performance Q2: dom0_max_vcpus=4 means "core0-3 will be just used by dom0" or means "4 cores(not dedicate cores) will be used by dom0, eg: core2-5 or core3-6? Q3.what does mean "nosmp" , xen,...

Hi experts, Q1:What''s the different for "dom0_max_vcpus=4 dom0_vcpus_pin" and "dom0_max_vcpus=4" ? which will get better performance Q2: dom0_max_vcpus=4 means "core0-3 will be just used by dom0" or means "4 cores(not dedicate cores) will be used by dom0, eg: core2-5 or core3-6? Q3.what does mean "nosmp" , xen,...

This caused particularly poor performance when booting a server in uniprocessor mode for debugging reasons, and had 4 dom0 vcpus competing for 1pcpus worth of time. -- Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer T: +44 (0)1223 225 900, http://www.citrix.com _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel

With GPLPV under 2.6.30, GPLPV gets the following from the ring: ring slot n (first buffer): status (length) = 54 bytes offset = 0 flags = NETRXF_extra_info (possibly csum too but not relevant) ring slot n + 1 (extra info) gso.size (mss) = 1460 Because NETRXF_extra_info is not set, that''s all I get for that packet. In the IP header though, the total length is 1544 (which in itself

With GPLPV under 2.6.30, GPLPV gets the following from the ring: ring slot n (first buffer): status (length) = 54 bytes offset = 0 flags = NETRXF_extra_info (possibly csum too but not relevant) ring slot n + 1 (extra info) gso.size (mss) = 1460 Because NETRXF_extra_info is not set, that''s all I get for that packet. In the IP header though, the total length is 1544 (which in itself

.... My /etc/default/grub is GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_CMDLINE_LINUX="crashkernel=auto rhgb intremap=no_x2apic_optout" GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=13312M,max:14336M dom0_max_vcpus=6 dom0_vcpus_pin" GRUB_GFXMODE=1024x768 GRUB_GFXPAYLOAD_LINUX=keep GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen nomodeset" I have tried setting (for a 1024x768 resolution) vga=792 in the GRUB_CMDLINE_LINUX and commenting out GRUB_GFXMODE and GRUB_GFXPAYLO...

...32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable xen_commandline : console=com1,com2,vga com1=115200,8n1 com2=115200,8n1 dom0_mem=1024M dom0_max_vcpus=1 dom0_vcpus_pin=true cc_compiler : gcc version 4.3.4 (Gentoo 4.3.4 p1.1, pie-10.1.5) cc_compile_by : root cc_compile_domain : nmsrv.com cc_compile_date : Mon Aug 22 11:28:50 PDT 2011 xend_config_format : 4 Seeing this on multiple dom0''s which are all r...

...ed to Cenots7 dom0, I have a really poor IO performance inside a PV VM. I have already done what is described on http://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance It is better now but still significantly worse than with centos6 dom0 my settings: xen parameter: dom0_mem=1024M cpufreq=xen dom0_max_vcpus=2 dom0_vcpus_pin xl sched-credit Cpupool Pool-0: tslice=30ms ratelimit=1000us Name ID Weight Cap Domain-0 0 1024 0 samael 1 256 0 satan 2 512 0 amon...

Hi, Seeing a drop-off in iops when more vcpu''s are added:- 3.8.2 kernel/xen-4.2.1/single domU/LVM backend/8GB RAM domU/2GB RAM dom0 dom0_max_vcpus=2 dom0_vcpus_pin domU 8 cores fio result 145k iops domU 10 cores fio result 99k iops domU 12 cores fio result 89k iops domU 14 cores fio result 81k iops ioping . -c 3 4096 bytes from . (ext4 /dev/xvda1): request=1 time=0.1 ms 4096 bytes from . (ext4 /dev/xvda1): request=2 time=0.7 ms 4096 byte...

Hello, I''m unable to boot a dom0 3.4.x kernel on top of xen4.1.x Xen seems to boot fine but the dom0 is crashing without any error: (XEN) Xen trace buffers: disabled (XEN) Std. Loglevel: All (XEN) Guest Loglevel: All (XEN) *** Serial input -> DOM0 (type ''CTRL-a'' three times to switch input to Xen) (XEN) Freed 232kB init memory. mapping kernel into physical memory

I use xen 4.0(dom0 is suse11.sp1,2.6.32 x86_64) on Dell R710 with PERC H700 RAID adapter. --Intel(R) Xeon(R) CPU E5620 @ 2.40GHz --8 CPU cores. --Memory 64G --RAID5 4.5T When I dedicated (pin) a CPU core only for dom0 use. (I specify "dom0_max_vcpus=1 dom0_vcpus_pin" options for Xen) I got dom0 kernel panic error(pin-1-5.30.bmp) When I pin 2 core to dom0, the dom0 system can boot up, but it can''t find any disk devices. But when I pin 4 core to dom0, it run OK. Does anyone can help me, please. I have read this mail, and update...

...: xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable xen_commandline : placeholder dom0_mem=1G,max:1G dom0_max_vcpus=2 cc_compiler : gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) cc_compile_by : stefan.bader cc_compile_domain : canonical.com cc_compile_date : Mon Feb 4 16:43:33 UTC 2013 xend_config_format : 4 If I boot a regular Ubuntu kernel, it sees all 16 GB of RAM. An...

...to start a domU: > [ 1902.049066] xend[12924]: segfault at b9ff6cd8 ip 00007f36c474afe1 sp 00007f36b9ff6af8 error 4 in libxenguest.so.4.0.0[7f36c4730000+24000] This is on an AMD CPU with the AVX instructions, and I already have this in my grub.cfg: > multiboot /xen-4.1.2.gz dom0_mem=3072M dom0_max_vcpus=2 dom0_vcpus_pin xsave=1 Before adding xsave=1, programs like gdb and xm would crash; after adding it, they don''t but xend still does. Here''s my uname -a: > Linux superbob 3.3.3-1-ARCH #1 SMP PREEMPT Mon Apr 23 09:41:07 CEST 2012 x86_64 AMD Opteron(tm) Processor 4238 Authent...

...ot;Ubuntu GNU\/Linux, with Xen hypervisor"/'' /etc/default/grub sed -i ''s/GRUB_CMDLINE_LINUX=.*\+/GRUB_CMDLINE_LINUX="apparmor=0"/'' /etc/default/grub sed -i ''/GRUB_CMDLINE_LINUX="apparmor=0"/ a\GRUB_CMDLINE_XEN="dom0_mem=384M,max:384M dom0_max_vcpus=1 no-bootscrub"'' /etc/default/grub update-grub echo "none /proc/xen xenfs defaults 0 0" >> /etc/fstab reboot After the reboot - $ ls /proc/xen capabilities privcmd xenbus xsd_kva xsd_port $ cat /proc/xen/capabilities control_d $ xl info libxl: error: libxl.c:8...

...ever, if not, I''d like to submit this as a mechanism for generating a bootable grub2 stanza for hypervisors. As the /etc/grub.d/* files rely on defaults in /etc/default/grub, I added the following Xen specific variable: GRUB_CMDLINE_XEN_DEFAULT="console=com1 115200,8n1 dom0_mem=512M dom0_max_vcpus=1 dom0_vcpus_pin=true iommu=1,passthrough,no-intremap loglvl=all loglvl_guest=all loglevl=10 debug acpi=force apic=on apic_verbosity=verbose numa=on" The script itself is a hacked version of the10-linux that comes with grub2. This is 09-xen so it places it''s boot entries ahead of the...

...gt; > GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" > GRUB_DEFAULT=saved > GRUB_DISABLE_SUBMENU=true > GRUB_CMDLINE_LINUX="crashkernel=auto rhgb intremap=no_x2apic_optout" > GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=13312M,max:14336M dom0_max_vcpus=6 > dom0_vcpus_pin" > GRUB_GFXMODE=1024x768 > GRUB_GFXPAYLOAD_LINUX=keep > GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen > nomodeset" > > I have tried setting (for a 1024x768 resolution) vga=792 in the > GRUB_CMDLINE_LINUX and co...

...hvm-3.0-x86_32 > hvm-3.0-x86_32p hvm-3.0-x86_64 > xen_scheduler : credit > xen_pagesize : 4096 > platform_params : virt_start=0xffff800000000000 > xen_changeset : unavailable > xen_commandline : placeholder loglvl=all dom0_mem=2048M > dom0_max_vcpus=2 com2=115200 console=com2,vga > cc_compiler : gcc (Debian 4.4.5-8) 4.4.5 > cc_compile_by : root > cc_compile_domain : wsk.tu-chemnitz.de > cc_compile_date : Tue May 14 09:16:43 CEST 2013 > xend_config_format : 4

Hi! I`m trying to boot dom0 with 4 processor activated. I used the option "dom0_max_vcpus=4" in my elilo.conf My 4 processors was loaded correctly, BUT the dom0 "hangs/crash" in radeonfb (I don`t understand...): ps: if I don`t set "dom0_max_vcpus=4" my dom0 loads perfect (but just with 1 processor) . . . radeonfb (0000:01:05.0): Mapped 1638k videoram radeonfb:...

Is there any technical reason for restricting dom0_max_vcpus to be no greater than num_online_cpus()? Since Dom0''s vCPU-s can be pinned later to a subset of physical CPUs anyway, allowing more vCPU-s from the beginning would seem to be only consistent. Thanks, Jan _______________________________________________ Xen-devel mailing list Xen-devel@li...

Hello, I''m using the following configuration on 8 different servers: xen 4.1.2 from opensuse 12.1 with Kernel 3.1.10-1.9-xen AMD Phenom(tm) II X6 1075T 8GB ram Dom0 : 1GB memory and 2 vcpus on core 0 (via boot option dom0_mem=1024M dom0_max_vcpus=2) DomU : 1 PV guest (opensuse12.1) 1GB memory 2 vcpus on core 1 to 5 1 PV guest (opensuse12.1) 1GB memory 3 vcpus on core 1 to 5 1 HVM guest with gplpv drivers(XP sp3) 1GB memory 1 vcpus on core 1 to 5 Also I''m using /usr/sbin/xm sched-credit -d Domain-0 -w 512 and /usr/sbin/xenpm se...