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[Xen-users] Xen Scalability Testing

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Subject: [Xen-users] Xen Scalability Testing
From: "Carb, Brian A" <Brian.Carb@xxxxxxxxxx>
Date: Mon, 5 Feb 2007 11:06:43 -0500
Cc: "Carb, Brian A" <Brian.Carb@xxxxxxxxxx>
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Thread-topic: Xen Scalability Testing
Since we've been focusing on scalability testing, I'd like to share some of our results.
We've been able to start 200 guest domains under SLES10 and Xen Unstable. In one test we successfully started 200 hardware-virtualized Win2003 domains, and in a separate test we successfully started 200 para-virtualized SLES10 domains. In both tests, after 200 guests, the host system became unresponsive - no errors were displayed on the serial console, and 'top' and 'xm top' sessions showed that sufficient memory was still available.
In these tests, Xen Unstable was built with NR_DYNIRQS = 1024, and the system was booted with dom0_mem=512M and xenheap_megabytes=64. Guests were each stored on separate luns on san storage, and booted via physical block device (phy:). No workload was run in the guests.
Host Platform Hardware:
    ES7000/0ne (2-cell configuration) with 16 cpus (8 dual-core sockets, non-hyperthreaded)
    64gb memory
    SAS internal RAID boot disks
    2 Emulex lp1005 HBAs.
Host Platform Software:
    Xen Unstable tree (changeset 13541)
    Code deviations from changeset: NR_DYNIRQS set to 1024 in ./linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/irq_vectors.h
    Additional Xen Boot Options: dom0_mem=512M,  xenheap_megabytes=64
Storage Subsystem:
    Unisys Clariion EMC CX600, 30 disk spindles @ 36GB 15Krpm configured as 200 4.5GB RAID5 volumes
Hardware-Virtualized Test:
    Guest domains: Win2003 Server Std Edition, 256mb memory, 1 vcpu, OS on single external physical lun, dhcp
Para-Virtualized Test:
    Guest domains: SLES10, 96mb memory, 4 vcpu, OS on single external physical lun, fixed IP

brian carb
unisys corporation - malvern, pa

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