linux-kernel - Re: Linux IO scalability and pushing over million IOPS over software iSCSI?

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Date:	Fri, 25 Jun 2010 12:36:00 +0300
From:	Pasi Kärkkäinen <pasik@....fi>
To:	linux-kernel@...r.kernel.org
Cc:	open-iscsi@...glegroups.com
Subject: Re: Linux IO scalability and pushing over million IOPS over
	software iSCSI?

Hello,

How about numbers using other transports? FC? Has someone done benchmarks recently? 

-- Pasi

On Tue, Jun 22, 2010 at 04:44:10PM +0300, Pasi Kärkkäinen wrote:
> Hello,
> 
> Recently Intel and Microsoft demonstrated pushing over 1.25 million IOPS using software iSCSI and a single 10 Gbit NIC:
> http://communities.intel.com/community/wired/blog/2010/04/22/1-million-iops-how-about-125-million
> 
> Earlier they achieved one (1.0) million IOPS:
> 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
> 
> The benchmark setup explained:
> http://communities.intel.com/community/wired/blog/2010/04/20/1-million-iop-article-explained
> http://dlbmodigital.microsoft.com/ppt/TN-100114-JSchwartz_SMorgan_JPlawner-1032432956-FINAL.pdf
> 
> 
> So the question is.. does someone have enough new hardware to try this with Linux?
> Can Linux scale to over 1 million IO operations per second?
> 
> 
> Intel and Microsoft used the following for the benchmark:
> 
> 	- Single Windows 2008 R2 system with Intel Xeon 5600 series CPU, 
> 	  single-port Intel 82599 10 Gbit NIC and MS software-iSCSI initiator 
> 	  connecting to 50x iSCSI LUNs.
> 	- IOmeter to benchmark all the 50x iSCSI LUNs concurrently.
> 
> 	- 10 servers as iSCSI targets, each having 5x ramdisk LUNs, total of 50x ramdisk LUNs.
> 	- iSCSI target server also used 10 Gbit NICs, and StarWind iSCSI target software.
> 	- Cisco 10 Gbit switch (Nexus) connecting the servers.
> 
> 	- For the 1.25 million IOPS result they used 512 bytes/IO benchmark, outstanding IOs=20.
> 	- No jumbo frames, just the standard MTU=1500.
> 
> They used many LUNs so they can scale the iSCSI connections to multiple CPU cores 
> using RSS (Receive Side Scaling) and MSI-X interrupts. 
> 
> So.. Who wants to try this? :) I don't unfortunately have 11x extra computers with 10 Gbit NICs atm to try it myself..
> 
> This test covers networking, block layer, and software iSCSI initiator..
> so it would be a nice to see if we find any bottlenecks from current Linux kernel.
> 
> Comments please!
> 
> -- Pasi
> 
> --
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