netdev - Re: [PATCH 0/2] xen/net: limit number of tx/rx queues

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Message-ID: <7b27cfa9-fbda-1c05-c6f5-1519e3fce5ef@oracle.com>
Date:   Sun, 29 Jan 2017 21:55:23 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, netdev@...r.kernel.org
Cc:     wei.liu2@...rix.com, paul.durrant@...rix.com
Subject: Re: [PATCH 0/2] xen/net: limit number of tx/rx queues



On 01/10/2017 08:32 AM, Juergen Gross wrote:
> The Xen network frontend/backend supports multiple tx/rx queues for one
> virtual interface. The number of queues supported by the backend is
> set to the number of cpus of the backend driver domain (usually dom0)
> and the number of queues requested by the frontend is limited by the
> number of vcpus of the related guest.
>
> On large systems this can lead to ridiculous large number of queues
> exhausting the required number of grant pages rather quick.
>
> To avoid this limit the default maximum on both sides to 8. Both
> frontend and backend maximum can be individually tuned via module
> parameters.
>
> Juergen Gross (2):
>   xen/netfront: set default upper limit of tx/rx queues to 8
>   xen/netback: set default upper limit of tx/rx queues to 8
>
>  drivers/net/xen-netback/netback.c | 6 ++++--
>  drivers/net/xen-netfront.c        | 6 ++++--
>  2 files changed, 8 insertions(+), 4 deletions(-)
>

Applied to for-linus-4.11

-boris