From: David Gibson <david@gibson.dropbear.id.au>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
Alexander Graf <agraf@suse.de>
Subject: Re: [Qemu-devel] [PATCH] pseries: Support for in-kernel XICS interrupt controller
Date: Thu, 6 Jun 2013 17:41:35 +1000 [thread overview]
Message-ID: <20130606074135.GC24421@voom.bne.redhat.com> (raw)
In-Reply-To: <1370417998-7061-1-git-send-email-aik@ozlabs.ru>
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On Wed, Jun 05, 2013 at 05:39:58PM +1000, Alexey Kardashevskiy wrote:
> From: David Gibson <david@gibson.dropbear.id.au>
>
> 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 <qiudayu@linux.vnet.ibm.com>: fixed mistype which caused ics_set_kvm_state() to fail]
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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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next prev parent reply other threads:[~2013-06-06 8:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 7:39 [Qemu-devel] [PATCH] pseries: Support for in-kernel XICS interrupt controller Alexey Kardashevskiy
2013-06-06 7:41 ` David Gibson [this message]
2013-06-06 8:19 ` Alexey Kardashevskiy
2013-06-08 10:20 ` Andreas Färber
2013-06-08 14:11 ` Alexey Kardashevskiy
2013-06-08 18:02 ` Andreas Färber
2013-06-20 23:10 ` Alexander Graf
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