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

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Date:	Thu, 14 Aug 2014 14:28:56 -0700 (PDT)
From:	David Miller <davem@...hat.com>
To:	haiyangz@...rosoft.com
Cc:	netdev@...r.kernel.org, kys@...rosoft.com, 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.
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