netdev - RE: [PATCH net-next 2/4] xen-netback: add control protocol implementation

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Date:	Mon, 9 May 2016 08:56:44 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Wei Liu <wei.liu2@...rix.com>
Subject: RE: [PATCH net-next 2/4] xen-netback: add control protocol
 implementation

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: 07 May 2016 20:09
> To: Paul Durrant
> Cc: xen-devel@...ts.xenproject.org; netdev@...r.kernel.org; Wei Liu
> Subject: Re: [PATCH net-next 2/4] xen-netback: add control protocol
> implementation
> 
> From: Paul Durrant <paul.durrant@...rix.com>
> Date: Thu, 5 May 2016 12:19:28 +0100
> 
> > +struct xenvif_hash_cache {
> > +	rwlock_t lock;
> 
> You really don't want to lock on every SKB hash computation like
> this, turn this into a spin lock for locking the write side and
> use RCU locking for lookup and usage.
>

Yes, that would be better. Will do.

Cheers,

  Paul
 
> THanks.