linux-kernel - RE: [PATCH net-next,v2] hyperv: Increase the buffer length for netvsc_channel

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Message-ID: <bbf016f1772245a6a08f92ea8346b8ff@DFM-DB3MBX15-08.exchange.corp.microsoft.com>
Date:	Thu, 14 Aug 2014 21:32:38 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	David Miller <davem@...hat.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>
Subject: RE: [PATCH net-next,v2] hyperv: Increase the buffer length for
 netvsc_channel_cb()



> -----Original Message-----
> From: David Miller [mailto:davem@...hat.com]
> Sent: Thursday, August 14, 2014 5:29 PM
> To: Haiyang Zhang
> Cc: netdev@...r.kernel.org; KY Srinivasan; olaf@...fle.de;
> jasowang@...hat.com; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org
> Subject: Re: [PATCH net-next,v2] hyperv: Increase the buffer length for
> netvsc_channel_cb()
> 
> From: Haiyang Zhang <haiyangz@...rosoft.com>
> Date: Wed, 13 Aug 2014 18:03:44 +0000
> 
> > When the buffer is too small for a packet from VMBus, a bigger buffer
> will be
> > allocated in netvsc_channel_cb() and retry reading the packet from
> VMBus.
> > Increasing this buffer size will reduce the retry overhead.
> >
> > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> ...
> > -	net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
> > +	net_device = vzalloc(sizeof(*net_device));
> 
> This isn't what I suggested that you do.
> 
> I said that the buffer inside of netvsc_device should be made an
> indirect pointer and thus allocated seperately.
> 
> Thus you're still kzalloc() net_device, but net_device->cb_buffer
> becomes "unsigned char *" and another allocation is made for it.

I will change the patch to this way.
Thanks,

- Haiyang

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