linux-kernel - Re: [Qemu-devel] [RFC] About 9pfs support "O

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Message-ID: <41088460-11f1-1ec7-2bfa-1ebdf675dc17@redhat.com>
Date:   Mon, 2 Apr 2018 04:45:36 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     jiangyiwen <jiangyiwen@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>,
        Greg Kurz <groug@...d.org>, aneesh.kumar@...ux.vnet.ibm.com
Cc:     v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org
Subject: Re: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?

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