From: Gerd Hoffmann <kraxel@redhat.com>
To: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 0/2] msi support for virtfs
Date: Thu, 11 Nov 2010 19:47:52 +0100 [thread overview]
Message-ID: <4CDC3A58.4060607@redhat.com> (raw)
In-Reply-To: <m34obnswgi.fsf@linux.vnet.ibm.com>
On 11/11/10 16:37, Aneesh Kumar K. V wrote:
> On Thu, 11 Nov 2010 12:59:24 +0100, Gerd Hoffmann<kraxel@redhat.com> wrote:
>> Hi,
>>
>> This tiny patch series adds msi support for virtfs. It's two patches
>> only because we need a compat property to stay compatible with -stable
>> and we don't have a pc-0.14 machine type yet, so this is added first.
>>
>
> Sorry for being dumb. But what does the above change help to achieve.
msi support makes the IRQ handling more efficient (no IRQ sharing, no
need to ack the IRQ to the ioapic). Look at /proc/interupts with and
without the patch ...
The compat property is for migration compatibility: qemu 0.14 should be
able to migrate to 0.13 with -M pc-0.13. To archive that we have to
disable new stuff which affects the savevm format (msi support does).
HTH
Gerd
next prev parent reply other threads:[~2010-11-11 18:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-11 11:59 [Qemu-devel] [PATCH 0/2] msi support for virtfs Gerd Hoffmann
2010-11-11 11:59 ` [Qemu-devel] [PATCH 1/2] pc: add 0.13 pc machine type Gerd Hoffmann
2010-11-11 11:59 ` [Qemu-devel] [PATCH 2/2] virtfs: enable MSI-X Gerd Hoffmann
2010-11-11 15:36 ` [Qemu-devel] [PATCH 0/2] msi support for virtfs Aneesh Kumar K. V
2010-11-11 15:37 ` Aneesh Kumar K. V
2010-11-11 18:47 ` Gerd Hoffmann [this message]
2010-11-16 17:56 ` [Qemu-devel] " Michael S. Tsirkin
2010-11-21 15:19 ` [Qemu-devel] " Anthony Liguori
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