lkml.org 
[lkml]   [2020]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] xen-blkback: add a parameter for disabling of persistent grants
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 <sjpark@amazon.de>
> >
> > 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 adds a module parameter for disabling of the
> > feature.
>
> Would it be better suited to have it per guest?

I think having a per-backend policy that could be specified at the
toolstack level would be nice, but I see that as a further
improvement.

Having a global backend domain policy of whether persistent grants are
enabled or not seems desirable, and if someone wants even more fine
grained control this change is AFAICT not incompatible with a
per-backend option anyway.

Roger.

\
 
 \ /
  Last update: 2020-09-24 12:14    [W:0.060 / U:0.848 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site