From: Anthony Liguori <anthony@codemonkey.ws>
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 13:41:02 -0600 [thread overview]
Message-ID: <4967A84E.9080908@codemonkey.ws> (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.
>
IO ports are much faster for notification than MMIO in KVM which is why
the space is currently IO ports. It was never meant to hold very large
amounts of data.
Regards,
Anthony Liguori
> Paul
> --
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next prev parent reply other threads:[~2009-01-09 19:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-07 17:37 [Qemu-devel] [PATCH 0/5][RFC] virtio-net: MAC filtering Alex Williamson
2009-01-09 19:27 ` Paul Brook
2009-01-09 19:37 ` Avi Kivity
2009-01-09 19:41 ` Anthony Liguori [this message]
2009-01-09 19:56 ` Paul Brook
2009-01-09 20:00 ` Anthony Liguori
2009-01-11 8:32 ` Avi Kivity
2009-01-13 21:23 ` [Qemu-devel] [PATCH 0/5] " Alex Williamson
2009-01-13 21:54 ` [Qemu-devel] " Anthony Liguori
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