Re: port-xen/50290: Regression: xennet very slow in netbsd-7

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Sep 29, 2015 at 11:55:00AM +0000, Stephen Borrill wrote:
> The following reply was made to PR port-xen/50290; it has been noted by GNATS.
> 
> From: Stephen Borrill <netbsd%precedence.co.uk@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Cc: 
> Subject: Re: port-xen/50290: Regression: xennet very slow in netbsd-7
> Date: Tue, 29 Sep 2015 12:51:44 +0100 (BST)
> 
>  This is down to options MBUFTRACE. On netbsd-5 this has little or no 
>  impact. On netbsd-7, it kills performance. Is this a bug or expected?

The xnenet mbuf code didn't change much between netbsd-5 and -7; the MCLAIM
calls are the same. Did you try a bare-metal kernel with MBUFTRACE ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--