Messages in this thread | | | From | Haiyang Zhang <> | Subject | RE: [PATCH net-next] hyperv: Add support for physically discontinuous receive buffer | Date | Mon, 27 Jan 2014 21:47:43 +0000 |
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> -----Original Message----- > From: KY Srinivasan > Sent: Monday, January 20, 2014 5:11 PM > To: Haiyang Zhang; David Miller > Cc: netdev@vger.kernel.org; olaf@aepfle.de; jasowang@redhat.com; linux- > kernel@vger.kernel.org; driverdev-devel@linuxdriverproject.org > Subject: RE: [PATCH net-next] hyperv: Add support for physically discontinuous > receive buffer > > > > > -----Original Message----- > > From: Haiyang Zhang > > Sent: Monday, January 20, 2014 2:06 PM > > To: David Miller > > Cc: netdev@vger.kernel.org; KY Srinivasan; olaf@aepfle.de; > > jasowang@redhat.com; linux-kernel@vger.kernel.org; driverdev- > > devel@linuxdriverproject.org > > Subject: RE: [PATCH net-next] hyperv: Add support for physically > > discontinuous receive buffer > > > > > > > > > -----Original Message----- > > > From: David Miller [mailto:davem@davemloft.net] > > > Sent: Tuesday, January 14, 2014 5:32 PM > > > To: Haiyang Zhang > > > Cc: netdev@vger.kernel.org; KY Srinivasan; olaf@aepfle.de; > > > jasowang@redhat.com; linux-kernel@vger.kernel.org; driverdev- > > > devel@linuxdriverproject.org > > > Subject: Re: [PATCH net-next] hyperv: Add support for physically > > > discontinuous receive buffer > > > > > > From: Haiyang Zhang <haiyangz@microsoft.com> > > > Date: Thu, 9 Jan 2014 14:24:47 -0800 > > > > > > > This will allow us to use bigger receive buffer, and prevent > > > > allocation failure due to fragmented memory. > > > > > > > > Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> > > > > Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> > > > > > > Not until you start using paged SKBs in netvsc_recv_callback. > > > > > > Whatever fragmention you think you're avoiding in the hyperv layer, > > > you're still going to get from the: > > > > > > skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); > > > > > > call there. > > > > > > This change makes no sense in isolation, therefore I'm not applying > > > it until you also include the appropriate changes to avoid the same > > > exact fragmentation issue in netvsc_drv.c as stated above. > > > > The receive buffer currently requires multiple MB of physically > > continuous memory, and may fail to be allocated when memory is > > fragmented. The patch is created for this issue. > > > > The SKB buffer is usually less than 1500 bytes or up to several KB > > with jumbo frame, so it's much less sensitive to fragmented memory. I > > will work on another patch to use SKB buffer with discontinuous pages. > > > > Could you accept this patch separately? > > Today, if we try to unload and load the network driver, the load may fail > because we may not be able to allocate the receive buffers if memory is > fragmented. This patch specifically addresses this problem. > > Regards, > > K. Y
Dave,
So, could this patch be taken first?
Thanks, - Haiyang
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