Re: [Xen-devel] xen-netback in linux 3.12

[Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>]

On 17/01/14 21:30, xu cong wrote:
> Hi all,
>
> I found xen-netback changed a lot in latest kernel. The shared
> xen-netback threads in driver domain is replaced by per-vif kernel
> thread. In my platform, I found the I/O throughput and scalability of
> per-vif netback is better than previous implementation. Another
> advantage is that I can use cgroups to control the CPU fair share among
> all VMs in driver domain (I group netback thread and blkback thread for
> each VM). Is there any other motivation for this modification? Thanks.
as far as I remember scalability was the only motivation. Previously you 
could end in a situation where one thread (pinned to a vCPU) did a lot 
of work while others nothing. In this thread-per-VIF model the kernel 
has the ability to schedule the workloads as it want, and users can also 
poke around with settings.
Zoli


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