Carb, Brian A
2007-Sep-14 19:26 UTC
[Xen-devel] Xen Stability Testing - 320 guest domains on ES7000
I''d like to share more of our Stability Testing results.
We''ve recently
executed 320 guest domains under SLES10 and Xen Unstable on our
ES7000/one platform. Each para-virtualized guest successfully ran
Kernbench, a cpu-intensive benchmark that generates its workload by
compiling a Linux kernel from source files. Throughout the testing, the
ES7000 environment was very stable - we were able to interact with
domain0 via putty sessions, and with the running guests via xm consoles
and networked secure shell commands.
In these tests, the ES7000/one was configured with 56 CPUs and 166gb
memory. Xen Unstable was built with NR_DYNIRQS=1024 and
max_phys_cpus=64, and the system was booted with dom0_mem=1024M and
xenheap_megabytes=64. Each guest was configured as a 4x para-virtualized
SLES10 machine with 512mb memory. Guests were each stored on separate
logical volumes on san storage, and booted via physical block device
(phy:).
Some features demonstrated by this testing include scalability (320
guests), stability of Xen on the ES7000 platform, and effective Xen
scheduling and handling of over-committed cpus (a total of 1280 virtual
CPUs mapped onto 54 physical CPUs).
Host Platform Hardware:
ES7000/0ne (7-cell configuration) using 56 cpus (28 dual-core
sockets, non-hyperthreaded)
166gb memory
SAS internal RAID boot disks
4 Emulex 2gb Fibre LP1005 HBAs.
Host Platform Software:
SLES10 Release
Xen Unstable tree (changeset 15445)
Code deviations from changeset:
NR_DYNIRQS set to 1024 in
./linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/irq_vectors.h
Compile Options: max_phys_cpus=64
Additional Xen Boot Options: dom0_mem=1024M, xenheap_megabytes=64
Storage:
Hardware: 28 Eurologic 72GB Fibre Channel 10k rpm drives in 2
enclosures, connected via four 2gb fiber paths
Management: Host-managed via LVM, 4 volume groups of 7 spanned
spindles each, split into 5gb volumes
Guest domains:
Configuration: Para-virtualized SLES10, 512mb memory, 4 vcpu, OS on
external physical storage, fixed IP
Kernbench test: kernbench -H -M -f -n 1
brian carb
unisys corporation - malvern, pa
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