netdev - RE: [PATCH net-next] hyperv: Increase the buffer length for netvsc_channel

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Message-ID: <8fc1fe81db1b450685921f9ea97f8477@DFM-DB3MBX15-06.exchange.corp.microsoft.com>
Date:	Tue, 5 Aug 2014 20:12:42 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	David Miller <davem@...emloft.net>,
	"thomas1206@...il.com" <thomas1206@...il.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] hyperv: Increase the buffer length for
 netvsc_channel_cb()



> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Tuesday, August 5, 2014 4:04 PM
> To: thomas1206@...il.com
> Cc: netdev@...r.kernel.org; Haiyang Zhang; KY Srinivasan; olaf@...fle.de;
> jasowang@...hat.com; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org
> Subject: Re: [PATCH net-next] hyperv: Increase the buffer length for
> netvsc_channel_cb()
> 
> From: Haiyang Zhang <thomas1206@...il.com>
> Date: Fri,  1 Aug 2014 15:55:30 +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>
> 
> I'm not applying this, sorry.
> 
> I said that because the structure that contains this buffer is now
> larger than a page, you should allocate the CB buffer externally
> via another kmalloc() or via the page allocator.

This must have been re-sent accidentally when we are updating our 
Email server... I will update the patch and re-submit it soon.

Thanks,
- Haiyang

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