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Re: [Qemu-devel] [PATCH] virtio-net: calculate proper msix vectors on in


From: Jason Wang
Subject: Re: [Qemu-devel] [PATCH] virtio-net: calculate proper msix vectors on init
Date: Fri, 21 Feb 2014 16:50:16 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

On 02/21/2014 01:00 PM, Jason Wang wrote:
> Currently, the default msix vectors for virtio-net-pci is 3 which is
> obvious not suitable for multiqueue guest, so we depends on the user
> or management tools to pass a correct vectors parameter. In fact, we
> can simplifying this by calculate the number of vectors on init.
>
> Consider we have N queues, the number of vectors needed is 2*N + 2
> (plus one config interrupt and control vq). We didn't check whether or
> not host support control vq because it was added unconditionally by
> qemu to avoid breaking legacy guests such as Minix.
>
> Cc: Paolo Bonzini <address@hidden>
> Cc: Michael S. Tsirkin <address@hidden>
> Signed-off-by: Jason Wang <address@hidden>
> ---

Unnecessary debug line was found, will send V2.



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