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== Memory Ballooning == | == Memory Ballooning == | ||
=== | === 64 bit guest === | ||
Original guest was | Original guest was 768M. Test was: | ||
<pre> | <pre> | ||
virsh shutdown f11 | virsh shutdown f11 | ||
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==== Balloon Up - fail? ==== | ==== Balloon Up - fail? ==== | ||
<pre> | <pre> | ||
[root@felix tmp]# grep -i memory f11 | [root@felix tmp]# grep -i memory f11.xml | ||
<memory>1048576</memory> | <memory>1048576</memory> | ||
<currentMemory>524288</currentMemory> | <currentMemory>524288</currentMemory> | ||
# guest is running... | # guest is running... | ||
[root@felix xen]# virsh setmem f11 | [root@felix xen]# virsh setmem f11 $(( 1024 * 1000 )) | ||
[root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | ||
[2009-05-06 23:24:23 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. | [2009-05-06 23:24:23 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. | ||
[root@felix xen]# virsh dominfo f11 | [root@felix xen]# virsh dominfo f11 | grep memory | ||
Max memory: 1048576 kB | Max memory: 1048576 kB | ||
Used memory: 524288 kB | Used memory: 524288 kB | ||
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==== Balloon Down - PASS ==== | ==== Balloon Down - PASS ==== | ||
<pre> | <pre> | ||
[root@felix tmp]# virsh setmem f11 | [root@felix tmp]# virsh setmem f11 $(( 1024 * 256 )) | ||
[root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | ||
[2009-05-06 23:36:08 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 256 MiB. | [2009-05-06 23:36:08 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 256 MiB. | ||
[root@felix tmp]# virsh dominfo f11 | [root@felix tmp]# virsh dominfo f11|grep memory | ||
Max memory: 1048576 kB | Max memory: 1048576 kB | ||
Used memory: 262144 kB | Used memory: 262144 kB | ||
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<pre> | <pre> | ||
[root@felix tmp]# virsh setmem f11 | [root@felix tmp]# virsh setmem f11 $(( 1024 * 1000 )) | ||
[root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 | ||
[2009-05-06 23:40:04 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. | [2009-05-06 23:40:04 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. | ||
[root@felix tmp]# virsh dominfo f11 | [root@felix tmp]# virsh dominfo f11|grep memory | ||
Max memory: 1048576 kB | Max memory: 1048576 kB | ||
Used memory: 524288 kB | Used memory: 524288 kB | ||
Revision as of 10:45, 7 May 2009
Notes from virtualization test day Test_Day:2009-05-07_Virtualization specifically for Test_Day:2009-05-07_Virtualization:XenDomU.
Xen DomU
Install
Worked for
- dom0 RHEL-5.3 with updated 5.4 test packages, 2.6.18-141.el5xen #1 SMP Wed May 6 03:54:02 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
- Quad-Core AMD Opteron(tm) Processor 2350
- fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni monitor cx16 lahf_lm cmp_legacy svm cr8_legacy
Memory Ballooning
64 bit guest
Original guest was 768M. Test was:
virsh shutdown f11 virsh dumpxml f11 > f11.xml
- Add currentMemory parameter which defines minimum memory given to guest at boot.
<memory>1048576</memory> <currentMemory>524288</currentMemory>
- Enact this guest config in Xen via libvirt.
virsh define f11.xml virsh start f11
See: QA_talk:Testcase_Virtualization_XenDomU_Memory_Ballooning
Balloon Up - fail?
[root@felix tmp]# grep -i memory f11.xml <memory>1048576</memory> <currentMemory>524288</currentMemory> # guest is running... [root@felix xen]# virsh setmem f11 $(( 1024 * 1000 )) [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 [2009-05-06 23:24:23 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. [root@felix xen]# virsh dominfo f11 | grep memory Max memory: 1048576 kB Used memory: 524288 kB
After few minutes guest free -m still reports 519.
Balloon Down - PASS
[root@felix tmp]# virsh setmem f11 $(( 1024 * 256 )) [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 [2009-05-06 23:36:08 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 256 MiB. [root@felix tmp]# virsh dominfo f11|grep memory Max memory: 1048576 kB Used memory: 262144 kB
Guest free -m reports 256.
Balloon Back Up - PASS
Apparently I'm mistaken in my understanding of <memory> and <currentMemory> tags.
I was not able to balloon above 519.
[root@felix tmp]# virsh setmem f11 $(( 1024 * 1000 )) [root@felix tmp]# grep 'memory target' /var/log/xen/xend.log |tail -1 [2009-05-06 23:40:04 28390] DEBUG (XendDomainInfo:664) Setting memory target of domain f11-32 (7) to 1000 MiB. [root@felix tmp]# virsh dominfo f11|grep memory Max memory: 1048576 kB Used memory: 524288 kB
Guest free -m reports 519 again.