* [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?
@ 2018-03-30 8:53 jiangyiwen
2018-04-02 2:45 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: jiangyiwen @ 2018-03-30 8:53 UTC (permalink / raw)
To: Andrew Morton, Eric Van Hensbergen, Ron Minnich, Latchesar Ionkov,
Greg Kurz, aneesh.kumar
Cc: linux-kernel, v9fs-developer, qemu-devel
Hi everyone,
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.
Thanks,
Yiwen.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?
2018-03-30 8:53 [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"? jiangyiwen
@ 2018-04-02 2:45 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2018-04-02 2:45 UTC (permalink / raw)
To: jiangyiwen, Andrew Morton, Eric Van Hensbergen, Ron Minnich,
Latchesar Ionkov, Greg Kurz, aneesh.kumar
Cc: v9fs-developer, linux-kernel, qemu-devel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-04-02 2:45 ` Paolo Bonzini
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