coLinux benchmarks

From: Dan Aloni (da-x_at_colinux.org)
Date: 04/05/04

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    Date:	Mon, 5 Apr 2004 15:15:20 +0200
To: Cooperative Linux Development <colinux-devel@lists.sourceforge.net>

    Hello,

    Today I ran some dbench2 benchmarks in order to test coLinux's
    (http://www.colinux.org) virtual disk I/O performance.

    I'm cross-posting this message to the LKML, as I know that on that
    list there are some benchmarking experts or other people who may
    find this interesting.

    This is the output from a coLinux 2.4.25 guest VM configured with
    128MB RAM running on a Linux 2.6.3 (BK) host that has a total of
    256MB RAM. The host machine has a Mobile Intel Celeron CPU (2.20GHz).
    All filesystems used are ext3.

        colinux:/home/dax# dbench 5 -s -S
        5 clients started
           0 62477 10.01 MB/sec
        Throughput 10.0026 MB/sec (sync open) (sync dirs) 5 procs

        colinux:/home/dax# dbench 5 -s -S
        5 clients started
           0 62477 10.43 MB/sec
        Throughput 10.4262 MB/sec (sync open) (sync dirs) 5 procs

        colinux:/home/dax# dbench 5 -s -S
        5 clients started
           0 62477 10.90 MB/sec
        Throughput 10.8926 MB/sec (sync open) (sync dirs) 5 procs

    I then ran the same thing on the host itself, *without* the
    coLinux VM running in the background:

        hostile17:~/colinux# dbench 5 -s -S
        5 clients started
           0 62477 5.08 MB/sec
        Throughput 5.07573 MB/sec (sync open) (sync dirs) 5 procs
        
        hostile17:~/colinux# dbench 5 -s -S
        5 clients started
           0 62477 5.13 MB/sec
        Throughput 5.12705 MB/sec (sync open) (sync dirs) 5 procs

    The VM shows better results than the host. What gives? Perhaps
    it is because of the combination of the host and guest's buffer
    cache? I'd like to know about more percise benchmarking methods
    for VMs. 

    -- 
Dan Aloni
Cooperative Linux, lead developer
da-x@colinux.org
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  • Next message: Russell King: "Re: drivers/char/dz.[ch]: reason for keeping?"

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