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Message-ID: <20110516072846.GA6610@redhat.com> Date: Mon, 16 May 2011 10:28:46 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Michał Mirosław <mirq-linux@...e.qmqm.pl> Cc: netdev@...r.kernel.org, Ben Hutchings <bhutchings@...arflare.com>, herbert@...dor.hengli.com.au Subject: Re: tap/bridge: Dropping NETIF_F_GSO/NETIF_F_SG On Thu, May 05, 2011 at 05:26:44PM +0200, Michał Mirosław wrote: > On Wed, May 04, 2011 at 09:18:14PM +0300, Michael S. Tsirkin wrote: > > BTW, I just noticed that net-next spits out > > many of the following when I run any VMs: > [...] > > tap0: Features changed: 0x40004040 -> 0x401b4849 > > Before this message, userspace called ioctl(TIOCSETOFFLOAD) > turning offloads on. > > > tap0: Dropping NETIF_F_SG since no checksum feature. > > tap0: Dropping NETIF_F_GSO since no SG feature. > > tap0: Features changed: 0x401b4849 -> 0x40004040 > > And then it probably called ioctl(TIOCSETOFFLOAD) again, disabling them. > > Best Regards, > Michał Mirosław I'd have to look at this some more, but I know qemu-kvm supports offloads with current kernels. There seems to be some kernel behaviour change here. > -- > 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 -- 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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