Wilk wrote:
> On Fri, Sep 21, 2012 at 04:52:47PM +0100, Oliver Chick wrote:
> > This patch implements persistent grants for the xen-blk{front,back}
> > mechanism. The effect of this change is to reduce the number of unmap
> > operations performed, since they cause a (costly) TLB
in granting, and ending foreign access.
Signed-off-by: Oliver Chick
---
Changes since v1:
* Maximum number of persistent grants per device now 64, rather than
256, as this is the actual maxmimum request in a (1 page) ring.
* If blkfront supplies more grefs than it is meant to, to blkbac
Changing the type of bdev parameters to be unsigned int :1, rather than bool.
This is more consistent with the types of other features in the block drivers.
Signed-off-by: Oliver Chick
---
drivers/block/xen-blkback/common.h |4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff
On Fri, 2012-09-21 at 08:18 +0100, Jan Beulich wrote:
> >>> On 20.09.12 at 23:24, Konrad Rzeszutek Wilk
> >>> wrote:
> > On Thu, Sep 20, 2012 at 03:13:42PM +0100, Oliver Chick wrote:
> >> On Thu, 2012-09-20 at 14:49 +0100, Konrad Rzeszutek Wilk wrote:
&g
On Thu, 2012-09-20 at 14:49 +0100, Konrad Rzeszutek Wilk wrote:
> On Thu, Sep 20, 2012 at 12:48:41PM +0100, Jan Beulich wrote:
> > >>> On 20.09.12 at 13:30, Oliver Chick wrote:
> > > The memory overhead, and fallback mode points are related:
> > > -Firstl
Thank you for all your useful feedback, Konrad.
I have made most of the changes you suggest. I will test them and
repost. I have made a few points below.
On Wed, 2012-09-19 at 15:11 +0100, Konrad Rzeszutek Wilk wrote:
> On Wed, Sep 19, 2012 at 11:51:27AM +0100, Oliver Chick wrote:
> > T
abel wrote:
> On 19/09/12 11:51, Oliver Chick wrote:
> > This patch implements persistent grants for the xen-blk{front,back}
> > mechanism.
> [...]
> > We (ijc, and myself) have introduced a new constant,
> > BLKIF_MAX_PERS_REQUESTS_PER_DEV. This is to prevent a malic
guest does an fio sequential read of the
ramdisk, then 2, then 3 etc.
-The y axis is the sum of the iops, as reported by the guests' fio
output.
On Wed, 2012-09-19 at 14:16 +0100, X5650Pasi Kärkkäinen wrote:
> On Wed, Sep 19, 2012 at 11:51:27AM +0100, Oliver Chick wrote:
> > This pa
?
On Wed, 2012-09-19 at 13:03 +0100, Jan Beulich wrote:
> >>> On 19.09.12 at 12:51, Oliver Chick wrote:
> > +/*
> > + * Maximum number of persistent grants that can be mapped by Dom0 for each
> > + * interface. This is set to be the size of the ring, as this is a limi
s of not performing TLB shootdowns. The answer
to that question is `no'. There appears to be very little, if any
additional cost to the guest of using persistent grants. There is
perhaps a small saving, from the reduced number of hypercalls
performed in granting, and ending foreign access.
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