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Re: [Qemu-devel] value of VIRTQUEUE_MAX_SIZE
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] value of VIRTQUEUE_MAX_SIZE |
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Date: |
Fri, 06 Feb 2015 06:22:41 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
On 02/06/2015 03:45 AM, Peter Lieven wrote:
>>> The idea was that IOV_MAX is the limit in case of at least virtio-blk. The
>>> host
>>> will not support more than IOV_MAX iovecs passed to a block request.
>> Is there an issue in practice?
>
> If there is no platform where IOV_MAX is less than 1024 then not.
POSIX allows for a system with IOV_MAX as small as 16. But these days,
systems we care about probably have a much larger value; alas, I don't
know off-hand what actual systems use to say if 1024 is a common minimum.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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