Am 24.11.2010 19:44, schrieb Christoph Hellwig:
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement (especially since it
amounts to standardising the ?BSD extension). I'm not sure of their
precise semantics (esp WRT ordering),
On Fri, Nov 26, 2010 at 12:03:35PM +0100, Kevin Wolf wrote:
I don't think the synchronous flushes even do what they're supposed to
do. Shouldn't ioreq-postsync do the flush after the request has
completed instead of doing it as soon as it has been submitted?
Indeed, that's yet another bug in
On Fri, 26 Nov 2010, Kevin Wolf wrote:
Am 24.11.2010 19:44, schrieb Christoph Hellwig:
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement (especially since it
amounts to standardising the ?BSD extension). I'm not sure of
Christoph Hellwig writes (Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and
qemu-xen: support empty write barriers in xen_disk):
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement (especially since it
amounts
On 11/25/2010 11:30 AM, Ian Jackson wrote:
Christoph Hellwig writes (Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and
qemu-xen: support empty write barriers in xen_disk):
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement
On Thu, Nov 25, 2010 at 11:46:40AM -0800, Jeremy Fitzhardinge wrote:
The latter. There's a question over whether WRITE_BARRIER really
supports empty barriers, since it appears that none of the existing
backends implement it correctly - but on the other hand, the kernel
blkback code does *try*
On 11/24/2010 08:58 AM, Christoph Hellwig wrote:
I had the discussion with Jeremy in Boston before, but let's repeat it
here:
- is there actually any pre-existing xen backend that does properly
implement empty barries. Back then we couldn't find any.
- if this is a new concept to Xen
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement (especially since it
amounts to standardising the ?BSD extension). I'm not sure of their
precise semantics (esp WRT ordering), but I think its already OK.
The nice bit is
On Wed, 24 Nov 2010, Christoph Hellwig wrote:
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
Linux wants is a useful thing to do and implement (especially since it
amounts to standardising the ?BSD extension). I'm not sure of their
precise semantics (esp WRT
