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    perfomance

    iSCSI Target for Microsoft Windows.

    Moderators: anton (staff), Max (staff), Constantin (staff)

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    perfomance

    Postby slavik » Wed May 12, 2010 12:02 pm

    hello
    i have strange very low perfomance, i have 1 esxi 4.0u1 (build 244038) on sun x4100 and starwind (5.3.0.1310) at windows 2003r2 x64 running on sun x4600, when i xmit data over gigabit copper i have about 3 meg per second even if device is ramdrive :shock:
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    Re: perfomance

    Postby Constantin (staff) » Thu May 13, 2010 8:46 am

    test your network please using iperf or NTTTCP
    Constantin Videnski
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    Re: perfomance

    Postby slavik » Thu May 13, 2010 9:07 am

    already, looks like this is esxi4 problem instead of starwind bug.
    good perfomance inside vm with microsoft initiator, and poor from host.
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    Re: perfomance

    Postby Constantin (staff) » Thu May 13, 2010 9:23 am

    OK... What build of ESX do you use and what NICs?
    Constantin Videnski
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    Re: perfomance

    Postby slavik » Thu May 13, 2010 12:22 pm

    "...esxi 4.0u1 (build 244038) on sun x4100..."
    onboard 1 intel pro 1000 mt dual port server, broadcom n/c
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    Re: perfomance

    Postby Constantin (staff) » Mon May 17, 2010 9:00 am

    That`s strange... Have you find ant reason of this problem?
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    Re: perfomance

    Postby slavik » Mon May 17, 2010 10:09 am

    no, i suggest this esxi4 perfomance problem is irq-flood related. Because i found similar problem with iscsi target based on freebsd (istgt). But there is much less perfomance penalty, native 30MB/s down to 10MB/s via gigabit iscsi, with starwind speed penalty native 90MB/s down to 3MB/s.
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    Re: perfomance

    Postby slavik » Wed May 19, 2010 12:13 pm

    up: this (3MBps) poor perfomance didn't stable, sometimes it raises up to 15-50MBps.
    anyway this is much less than raw perfomance from SAS stripe (85 to 110 MBps)
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    Re: perfomance

    Postby anton (staff) » Wed May 19, 2010 3:22 pm

    If you have the same degradation picture with other iSCSI target I'd suggest you to double-check ESX(i) iSCSI initiator settings and if approved OK check other hardware.
    Regards,
    Anton Kolomyeytsev

    Chief Technology Officer, StarWind Software

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    Re: perfomance

    Postby slavik » Thu May 20, 2010 4:05 am

    anton, what settings exactly you suggest to check?
    hardware is okey, this was checked already, and indirectly indicated by fact that inside VM iscsi initiator works much better
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    Re: perfomance

    Postby Max (staff) » Thu May 20, 2010 3:56 pm

    slavik
    Please try connecting ESXi host directly to the StarWind server using a straight connection and reproducing the issue.
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    Re: perfomance

    Postby slavik » Fri Jun 11, 2010 5:55 am

    max, "good perfomance inside vm with microsoft initiator, and poor from host." - this means if initiator inside VM i has nice speed, so I suggest this bug does NOT network related, but i can test straight connection speed next week
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    Re: perfomance

    Postby Constantin (staff) » Fri Jun 11, 2010 1:12 pm

    So, please inform about result of test (direct connection w/o switch) in datacenter.
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