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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver |
Date: | Thu, 25 Mar 2010 11:58:30 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 |
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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