netdev - Re: [Xen-devel] [PATCH] xen-netfront: correct MAX_TX

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Message-ID: <4F2BE39E.9030101@redhat.com>
Date:	Fri, 03 Feb 2012 14:39:42 +0100
From:	Laszlo Ersek <lersek@...hat.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Wei Liu <wei.liu2@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH] xen-netfront: correct	MAX_TX_TARGET	calculation.

On 02/03/12 14:26, Jan Beulich wrote:
>>>> On 03.02.12 at 13:59, Laszlo Ersek<lersek@...hat.com>  wrote:

>> (Eyeballing the source makes me think
>>
>>     NET_TX_RING_SIZE == (4096 - 16 - 48) / (5 * 4) == 201
>>     NET_RX_RING_SIZE == (4096 - 16 - 48) / (4 * 4) == 252
>
> NET_TX_RING_SIZE == (4096 - 16 - 48) / (6 * 2) == 336
> NET_RX_RING_SIZE == (4096 - 16 - 48) / (4 * 2) == 504

Sorry, I wasn't sure if gcc would pack them without 
__attribute__((packed)) :) Dumb mistake, admittedly.

Thanks,
Laszlo
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