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

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Message-ID: <20170110135422.GL1100@citrix.com>
Date:   Tue, 10 Jan 2017 13:54:22 +0000
From:   Wei Liu <wei.liu2@...rix.com>
To:     Juergen Gross <jgross@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        <netdev@...r.kernel.org>, <boris.ostrovsky@...cle.com>,
        <wei.liu2@...rix.com>, <paul.durrant@...rix.com>
Subject: Re: [PATCH 0/2] xen/net: limit number of tx/rx queues

On Tue, Jan 10, 2017 at 02:32:50PM +0100, 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
> 

Acked-by: Wei Liu <wei.liu2@...rix.com>