From: Avi Kivity <avi@redhat.com>
To: Paul Brook <paul@codesourcery.com>
Cc: qemu-devel@nongnu.org, Alex Williamson <alex.williamson@hp.com>,
kvm <kvm@vger.kernel.org>, Mark McLoughlin <markmc@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 0/5][RFC] virtio-net: MAC filtering
Date: Fri, 09 Jan 2009 21:37:51 +0200 [thread overview]
Message-ID: <4967A78F.7020006@redhat.com> (raw)
In-Reply-To: <200901091127.32987.paul@codesourcery.com>
Paul Brook wrote:
>> A concern here is the growing size of the virtio-net I/O port space
>> config. This series brings it up to 256 bytes with PCI resource
>> rounding. The VLAN filter bitmap would increase that by another 512
>> bytes, making it 1kB and limiting us to something less than 64 such
>> devices per guest. Is anyone worried? Should filter tables live in
>> MMIO space for virtio devices? I'll send out the guest side patches for
>> virtio-net in a separate thread. Thanks,
>>
>
> This is one reason why IO ports are a reallybad idea. Use memory mapped
> register spaces like any other sane system and you won't have a problem.
>
mmio is slower for virtualization. But I agree pio is baroque.
Luckily we didn't implement the 768 pci slot thing, that wouldn't have
flown (for yet another reason).
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Paul Brook <paul@codesourcery.com>
Cc: Mark McLoughlin <markmc@redhat.com>,
qemu-devel@nongnu.org, Alex Williamson <alex.williamson@hp.com>,
kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] [PATCH 0/5][RFC] virtio-net: MAC filtering
Date: Fri, 09 Jan 2009 21:37:51 +0200 [thread overview]
Message-ID: <4967A78F.7020006@redhat.com> (raw)
In-Reply-To: <200901091127.32987.paul@codesourcery.com>
Paul Brook wrote:
>> A concern here is the growing size of the virtio-net I/O port space
>> config. This series brings it up to 256 bytes with PCI resource
>> rounding. The VLAN filter bitmap would increase that by another 512
>> bytes, making it 1kB and limiting us to something less than 64 such
>> devices per guest. Is anyone worried? Should filter tables live in
>> MMIO space for virtio devices? I'll send out the guest side patches for
>> virtio-net in a separate thread. Thanks,
>>
>
> This is one reason why IO ports are a reallybad idea. Use memory mapped
> register spaces like any other sane system and you won't have a problem.
>
mmio is slower for virtualization. But I agree pio is baroque.
Luckily we didn't implement the 768 pci slot thing, that wouldn't have
flown (for yet another reason).
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2009-01-09 19:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-07 17:37 [PATCH 0/5][RFC] virtio-net: MAC filtering Alex Williamson
2009-01-07 17:37 ` [Qemu-devel] " Alex Williamson
2009-01-09 19:27 ` Paul Brook
2009-01-09 19:27 ` Paul Brook
2009-01-09 19:37 ` Avi Kivity [this message]
2009-01-09 19:37 ` Avi Kivity
2009-01-09 19:41 ` Anthony Liguori
2009-01-09 19:41 ` Anthony Liguori
2009-01-09 19:56 ` Paul Brook
2009-01-09 19:56 ` Paul Brook
2009-01-09 20:00 ` Anthony Liguori
2009-01-09 20:00 ` Anthony Liguori
2009-01-11 8:32 ` Avi Kivity
2009-01-11 8:32 ` Avi Kivity
2009-01-13 21:23 ` [PATCH 0/5] " Alex Williamson
2009-01-13 21:23 ` [Qemu-devel] " Alex Williamson
2009-01-13 21:54 ` Anthony Liguori
2009-01-13 21:54 ` [Qemu-devel] " Anthony Liguori
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