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Re: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"? |
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Date: |
Mon, 2 Apr 2018 04:45:36 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
On 30/03/2018 10:53, jiangyiwen wrote:
> Currently, I found virtio-9p in VirtFS don't support "O_DIRECT + aio"
> mode, both v9fs and qemu. So when user use "O_DIRECT + aio" mode and
> increase iodepths, they can't get higher IOPS.
>
> I want to know why v9fs don't implement this mode? And I will try to
> implement this mode from now on.
Can you explain? I think 9p has support for direct I/O in Linux. See
v9fs_direct_IO in fs/9p/vfs_addr.c.
Paolo
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