Messages in this thread | | | Subject | Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list | From | Jason Wang <> | Date | Mon, 26 Oct 2015 14:53:38 +0800 |
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On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote: > On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote: >> >> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote: >>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote: >>>> We don't have fraglist support in TAP_FEATURES. This will lead >>>> software segmentation of gro skb with frag list. Fixes by having >>>> frag list support in TAP_FEATURES. >>>> >>>> With this patch single session of netperf receiving were restored from >>>> about 5Gb/s to about 12Gb/s on mlx4. >>>> >>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features") >>>> Cc: Vlad Yasevich <vyasevic@redhat.com> >>>> Cc: Michael S. Tsirkin <mst@redhat.com> >>>> Signed-off-by: Jason Wang <jasowang@redhat.com> >>> Thanks! >>> Does this mean we should look at re-adding NETIF_F_FRAGLIST >>> to virtio-net as well? >> Not sure I get the point, but probably not. This is for receiving and >> skb_copy_datagram_iter() can deal with frag list. > > Point is: > - bridge within guest > - assigned device creating gro skbs with frag list bridged to virtio
I see, but this problem looks not specific to virtio. Most cards does not support frag list.
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