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Date: Thu, 11 Nov 2010 16:28:21 +0800 From: "Xin, Xiaohui" <xiaohui.xin@...el.com> To: David Miller <davem@...emloft.net> CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "mst@...hat.com" <mst@...hat.com>, "mingo@...e.hu" <mingo@...e.hu>, "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>, "jdike@...ux.intel.com" <jdike@...ux.intel.com> Subject: RE: [PATCH v15 00/17] Provide a zero-copy method on KVM virtio-net. >-----Original Message----- >From: David Miller [mailto:davem@...emloft.net] >Sent: Thursday, November 11, 2010 1:47 AM >To: Xin, Xiaohui >Cc: netdev@...r.kernel.org; kvm@...r.kernel.org; linux-kernel@...r.kernel.org; >mst@...hat.com; mingo@...e.hu; herbert@...dor.apana.org.au; jdike@...ux.intel.com >Subject: Re: [PATCH v15 00/17] Provide a zero-copy method on KVM virtio-net. > >From: xiaohui.xin@...el.com >Date: Wed, 10 Nov 2010 17:23:28 +0800 > >> From: Xin Xiaohui <xiaohui.xin@...el.com> >> >>>2) The idea to key off of skb->dev in skb_release_data() is >>> fundamentally flawed since many actions can change skb->dev on you, >>> which will end up causing a leak of your external data areas. >> >> How about this one? If the destructor_arg is not a good candidate, >> then I have to add an apparent field in shinfo. > >If destructor_arg is actually a net_device pointer or similar, >you will need to take a reference count on it or similar. > Do you mean destructor_arg will be consumed by other user? If that case, may I add a new structure member in shinfo? Thus only zero-copy will use it, and no need for the reference count. >Which means --> good bye performance especially on SMP. > >You're going to be adding new serialization points and at >least two new atomics per packet. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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