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Re: [Qemu-devel] [PATCH] pseries: Support for in-kernel XICS interrupt c
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [PATCH] pseries: Support for in-kernel XICS interrupt controller |
Date: |
Thu, 6 Jun 2013 17:41:35 +1000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Jun 05, 2013 at 05:39:58PM +1000, Alexey Kardashevskiy wrote:
> From: David Gibson <address@hidden>
>
> Recent (host) kernels support emulating the PAPR defined "XICS" interrupt
> controller system within KVM. This patch allows qemu to initialize and
> configure the in-kernel XICS, and keep its state in sync with qemu's XICS
> state as necessary.
>
> This should give considerable performance improvements. e.g. on a simple
> IPI ping-pong test between hardware threads, using qemu XICS gives us
> around 5,000 irqs/second, whereas the in-kernel XICS gives us around
> 70,000 irqs/s on the same hardware configuration.
>
> [Mike Qiu <address@hidden>: fixed mistype which caused ics_set_kvm_state() to
> fail]
> Signed-off-by: David Gibson <address@hidden>
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
I think this one also needs the headers update for qemu first, yes?
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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