Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-24 Thread Konrad Rzeszutek Wilk
.snip.. > > For the reason, I'd like to suggest to keep this as is for now and expand it > > with the 'exceptions list' idea or something better, if a real use case > > comes > > out later. > > I agree. I'm happy to take patches to implement more fine grained > control, but that shouldn't prevent

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-24 Thread Roger Pau Monné
On Thu, Sep 24, 2020 at 12:27:14PM +0200, SeongJae Park wrote: > On Thu, 24 Sep 2020 12:13:44 +0200 "Roger Pau Monné" > wrote: > > > On Wed, Sep 23, 2020 at 04:09:30PM -0400, Konrad Rzeszutek Wilk wrote: > > > On Tue, Sep 22, 2020 at 09:01:25AM +0200, SeongJae Park wrote: > > > > From: SeongJae

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-24 Thread Roger Pau Monné
On Wed, Sep 23, 2020 at 04:09:30PM -0400, Konrad Rzeszutek Wilk wrote: > On Tue, Sep 22, 2020 at 09:01:25AM +0200, SeongJae Park wrote: > > From: SeongJae Park > > > > Persistent grants feature provides high scalability. On some small > > systems, however, it could incur data copy overhead[1] an

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-23 Thread SeongJae Park
On Wed, 23 Sep 2020 16:09:30 -0400 Konrad Rzeszutek Wilk wrote: > On Tue, Sep 22, 2020 at 09:01:25AM +0200, SeongJae Park wrote: > > From: SeongJae Park > > > > Persistent grants feature provides high scalability. On some small > > systems, however, it could incur data copy overhead[1] and th

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-23 Thread Konrad Rzeszutek Wilk
On Tue, Sep 22, 2020 at 09:01:25AM +0200, SeongJae Park wrote: > From: SeongJae Park > > Persistent grants feature provides high scalability. On some small > systems, however, it could incur data copy overhead[1] and thus it is > required to be disabled. But, there is no option to disable it.

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-22 Thread Roger Pau Monné
On Tue, Sep 22, 2020 at 09:01:25AM +0200, SeongJae Park wrote: > From: SeongJae Park > > Persistent grants feature provides high scalability. On some small > systems, however, it could incur data copy overhead[1] and thus it is > required to be disabled. But, there is no option to disable it.

Re: [PATCH] xen-blkback: add a parameter for disabling of persistent grants

2020-09-22 Thread Jürgen Groß
On 22.09.20 09:01, SeongJae Park wrote: From: SeongJae Park Persistent grants feature provides high scalability. On some small systems, however, it could incur data copy overhead[1] and thus it is required to be disabled. But, there is no option to disable it. For the reason, this commit add