Messages in this thread |  | | Date | Thu, 14 Nov 2013 16:06:44 -0500 (EST) | Subject | Re: [PATCH net V2 2/2] macvtap: limit head length of skb allocated | From | David Miller <> |
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From: Jason Wang <jasowang@redhat.com> Date: Wed, 13 Nov 2013 14:00:40 +0800
> We currently use hdr_len as a hint of head length which is advertised by > guest. But when guest advertise a very big value, it can lead to an 64K+ > allocating of kmalloc() which has a very high possibility of failure when host > memory is fragmented or under heavy stress. The huge hdr_len also reduce the > effect of zerocopy or even disable if a gso skb is linearized in guest. > > To solves those issues, this patch introduces an upper limit (PAGE_SIZE) of the > head, which guarantees an order 0 allocation each time. > > Cc: Stefan Hajnoczi <stefanha@redhat.com> > Cc: Michael S. Tsirkin <mst@redhat.com> > Signed-off-by: Jason Wang <jasowang@redhat.com>
Applied and queued up for -stable.
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