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/2010/01/19/1000000-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.
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