udp: be less conservative with sock rmem accounting
Before commit 850cbadd ("udp: use it's own memory accounting schema"), the udp protocol allowed sk_rmem_alloc to grow beyond the rcvbuf by the whole current packet's truesize. After said commit we allow sk_rmem_alloc to exceed the rcvbuf only if the receive queue is empty. As reported by Jesper this cause a performance regression for some (small) values of rcvbuf. This commit is intended to fix the regression restoring the old handling of the rcvbuf limit. Reported-by:Jesper Dangaard Brouer <brouer@redhat.com> Fixes: 850cbadd ("udp: use it's own memory accounting schema") Signed-off-by:
Paolo Abeni <pabeni@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
12efa1fa
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