From: Paolo Bonzini <pbonzini@redhat.com>
To: jiangyiwen <jiangyiwen@huawei.com>,
Andrew Morton <akpm@linux-foundation.org>,
Eric Van Hensbergen <ericvh@gmail.com>,
Ron Minnich <rminnich@sandia.gov>,
Latchesar Ionkov <lucho@ionkov.net>, Greg Kurz <groug@kaod.org>,
aneesh.kumar@linux.vnet.ibm.com
Cc: v9fs-developer@lists.sourceforge.net,
linux-kernel@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?
Date: Mon, 2 Apr 2018 04:45:36 +0200 [thread overview]
Message-ID: <41088460-11f1-1ec7-2bfa-1ebdf675dc17@redhat.com> (raw)
In-Reply-To: <5ABDFB24.1080207@huawei.com>
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
prev parent reply other threads:[~2018-04-02 2:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-30 8:53 [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"? jiangyiwen
2018-04-02 2:45 ` Paolo Bonzini [this message]
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