From: Eric Sandeen <sandeen@sandeen.net>
To: Christoph Hellwig <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>
Cc: Eric Sandeen <sandeen@redhat.com>, xfs-oss <xfs@oss.sgi.com>
Subject: Re: [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg
Date: Thu, 14 Nov 2013 08:56:04 -0600 [thread overview]
Message-ID: <5284E484.6090001@sandeen.net> (raw)
In-Reply-To: <20131114133749.GA26268@infradead.org>
On 11/14/13, 7:37 AM, Christoph Hellwig wrote:
> On Thu, Nov 14, 2013 at 08:26:58AM +1100, Dave Chinner wrote:
>> Seems like that's the avenue for improvement here to me. i.e. expose
>> the correct values to the guest so it's mkfs does the right thing.
>> Or, alternatively, make qemu buffer non-aligned/sized IOs itself
>> internally.
>
> I've implemented the support to expose these to the guest in qemu
> years ago. But the problem remains that this is information which
> needs to be attached to the image, which can't really work with raw
> images, and no one has bother to implement the support to store it
> for say qcow2.
>
Ok but once again - this is not a guest mkfs issue. The reported
problem is that the guest cannot _boot_ in cache=none mode because
the bios attempts a 512-byte DIO.
Yes, this is all qemu's fault. We can fight that in the court
of public opinion, I guess.
-Eric
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next prev parent reply other threads:[~2013-11-14 14:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-13 18:25 [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg Eric Sandeen
2013-11-13 18:56 ` Christoph Hellwig
2013-11-13 19:08 ` Eric Sandeen
2013-11-13 21:26 ` Dave Chinner
2013-11-13 21:32 ` Eric Sandeen
2013-11-13 22:10 ` Dave Chinner
2013-11-13 22:18 ` Eric Sandeen
2013-11-14 0:34 ` Dave Chinner
2013-11-14 13:37 ` Christoph Hellwig
2013-11-14 14:56 ` Eric Sandeen [this message]
2013-11-14 21:01 ` Dave Chinner
2013-11-22 14:13 ` Ric Wheeler
2013-11-22 14:20 ` Christoph Hellwig
2013-11-22 14:26 ` Ric Wheeler
2013-11-22 14:57 ` Eric Sandeen
2013-11-14 0:35 ` Eric Sandeen
2013-11-14 6:49 ` Dave Chinner
2013-11-14 13:09 ` Ric Wheeler
2013-11-14 15:03 ` Eric Sandeen
2013-11-14 15:18 ` Eric Sandeen
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