Re: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources

From	David Vrabel <david.vrabel@citrix.com>
Newsgroups	linux.kernel
Subject	Re: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources
Date	2016-07-28 11:40 +0200
Message-ID	<rZPXj-4m8-5@gated-at.bofh.it> (permalink)
References	<rZnHH-2rc-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 27/07/16 04:21, Bob Liu wrote:
> The current VBD layer reserves buffer space for each attached device based on
> three statically configured settings which are read at boot time.
>  * max_indirect_segs: Maximum amount of segments.
>  * max_ring_page_order: Maximum order of pages to be used for the shared ring.
>  * max_queues: Maximum of queues(rings) to be used.

I think you want a single knob for "maximum number of pages in flight".
 This is much easier for an admin to relate to resource usage.

You could apply this limit without having to reconfigure, which would
simplify this patch quite a bit.

David

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[PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources Bob Liu <bob.liu@oracle.com> - 2016-07-27 05:30 +0200
  Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd  resources Roger Pau Monné <roger.pau@citrix.com> - 2016-07-27 10:10 +0200
    Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources Bob Liu <bob.liu@oracle.com> - 2016-07-27 11:20 +0200
      RE: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of  per-vbd resources Paul Durrant <Paul.Durrant@citrix.com> - 2016-07-27 11:30 +0200
      Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd  resources Roger Pau Monné <roger.pau@citrix.com> - 2016-07-27 12:10 +0200
  Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd  resources Roger Pau Monné <roger.pau@citrix.com> - 2016-07-27 13:10 +0200
    Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources Bob Liu <bob.liu@oracle.com> - 2016-07-27 13:30 +0200
      Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd  resources Roger Pau Monné <roger.pau@citrix.com> - 2016-07-27 16:30 +0200
        Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources Bob Liu <bob.liu@oracle.com> - 2016-07-28 01:10 +0200
          Re: [PATCH v3] xen-blkfront: dynamic configuration of per-vbd  resources Roger Pau Monné <roger.pau@citrix.com> - 2016-07-28 09:50 +0200
  Re: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of  per-vbd resources David Vrabel <david.vrabel@citrix.com> - 2016-07-28 11:40 +0200

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