Re: [Xen-devel] Xen dom0 network I/O scalability

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Apr 27, 2011 at 12:30:27PM -0500, Kaushik Kumar Ram wrote:
> Hi folks,
> 
> I have a few questions/clarifications about dom0 network I/O scalability. I 
> would appreciate any feedback/pointers.
> 
> So the current implementation of netback does not scale beyond a single CPU 
> core, thanks to the use of tasklets, making it a bottleneck (please correct 
> me if I am wrong). I remember coming across some patches which attempts to 
> use softirqs instead of tasklets to solve this issue. But the latest version 
> of linux-2.6-xen.hg repo does not include them. Are they included in some 
> other version of dom0 Linux? Or will they be included in future? This seems 
> like a very important problem to solve especially as the number of VMs and 
> number of CPU cores go up. Is there any fundamental limitation in solving 
> this problem?

You should be using the 2.6.39 kernel or the 2.6.32 to take advantage of those 
patches.
> 
> Thanks.
> --Kaushik

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