guy keren, on 06/15/2010 01:46 AM wrote:
Vladislav Bolkhovitin wrote:
Pasi Kärkkäinen, on 06/11/2010 11:26 AM wrote:
On Fri, Feb 05, 2010 at 02:10:32PM +0300, Vladislav Bolkhovitin wrote:
Pasi Kärkkäinen, on 01/28/2010 03:36 PM wrote:
Hello list,
Please check these news items:
http://blog.fosketts.net/2010/01/14/microsoft-intel-push-million-iscsi-iops/
http://communities.intel.com/community/openportit/server/blog/2010/01/19/100-iops-with-iscsi--thats-not-a-typo
http://www.infostor.com/index/blogs_new/dave_simpson_storage/blogs/infostor/dave_simpon_storage/post987_37501094375591341.html
1,030,000 IOPS over a single 10 Gb Ethernet link
Specifically, Intel and Microsoft clocked 1,030,000 IOPS (with
512-byte blocks), and more than 2,250MBps with large block sizes
(16KB to 256KB) using the Iometer benchmark
So.. who wants to beat that using Linux + open-iscsi? :)
I personally, don't like such tests and don't trust them at all.
They are pure marketing. The only goal of them is to create
impression that X (Microsoft and Windows in this case) is a
super-puper ahead of the world. I've seen on the Web a good article
about usual tricks used by vendors to cheat benchmarks to get good
marketing material, but, unfortunately, can't find link on it at the
moment.
The problem is that you can't say from such tests if X will also
ahead of the world on real life usages, because such tests always
heavily optimized for particular used benchmarks and such
optimizations almost always hurt real life cases. And you hardly
find descriptions of those optimizations as well as a scientific
description of the tests themself. The results published practically
only in marketing documents.
Anyway, as far as I can see Linux supports all the used hardware as
well as all advance performance modes of it, so if one repeats this
test in the same setup, he/she should get not worse results.
For me personally it was funny to see how MS presents in the WinHEC
presentation
(http://download.microsoft.com/download/5/E/6/5E66B27B-988B-4F50-AF3A-C2FF1E62180F/COR-T586_WH08.pptx)
that they have 1.1GB/s from 4 connections. In the beginning of 2008
I saw a *single* dd pushing data on that rate over a *single*
connection from Linux initiator to iSCSI-SCST target using regular
Myricom hardware without any special acceleration. I didn't know how
proud I must have been for Linux :).
It seems they've described the setup here:
http://communities.intel.com/community/wired/blog/2010/04/20/1-million-iop-article-explained
And today they seem to have a demo which produces 1.3 million IOPS!
1 Million IOPS? How about 1.25 Million!:
http://communities.intel.com/community/wired/blog/2010/04/22/1-million-iops-how-about-125-million
I'm glad for them. The only thing surprises me that none of the Linux
vendors, including Intel itself, interested to repeat this test for
Linux and fix possible found problems, if any. Ten years ago similar
test about Linux TCP scalability limitations comparing with Windows
caused massive reaction and great TCP improvements.
The way how to do the test is quite straightforward, starting from
making for Linux similarly effective test tool as IOMeter on Windows
[1]. Maybe, the lack of such tool scares the vendors away?
Vlad
[1] None of the performance measurement tools for Linux I've seen so
far, including disktest (although I've not looked at newer (1-1.5 years)
versions) and fio satisfied me for various reasons.
there's iometer agent (dynamo) for linux (but the official version has
some one fundamental flow, which should be fixed - it doesn't use AIO
properly) - you just need a windows desktop to launch the test, and run
the dynamo agent on a linux machine.
there is also vdbench from sun.
vdbench is Java-based, so not suitable for this particular case, where
low CPU overhead is a key.
--guy
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