Re: [PATCH v3 1/1] Shared memory uio_pci driver

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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.

--
error compiling committee.c: too many arguments to function

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