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[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver |
Date: |
Thu, 25 Mar 2010 12:07:41 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Thu, Mar 25, 2010 at 11:58:30AM +0200, Avi Kivity wrote:
> On 03/25/2010 11:44 AM, Michael S. Tsirkin wrote:
>> On Thu, Mar 25, 2010 at 11:40:09AM +0200, Avi Kivity wrote:
>>
>>> On 03/25/2010 11:15 AM, Michael S. Tsirkin wrote:
>>>
>>>> - Why are you using 32 bit long memory accesses for interrupts?
>>>> 16 bit IO eould be enough and it's faster. This what virtio-pci does.
>>>>
>>>>
>>>>
>>> Why is 16 bit io faster?
>>>
>> Something to do with need for emulation to get address/data
>> for pci memory accesses?
>>
>
> pio is definitely faster than mmio (all that is needed is to set one bit
> on the BAR). But 32 vs. 16 makes no difference.
Right. That's what I meant.
> --
> error compiling committee.c: too many arguments to function
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Cam Macdonell, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Avi Kivity, 2010/03/25