Re: [PATCH net-next] udp: be less conservative with sock rmem accounting
flat view
From: David Miller <davem@davemloft.net>
Date: 2016-12-03 21:15:04
From: Paolo Abeni <pabeni@redhat.com> Date: Fri, 2 Dec 2016 17:35:49 +0100
Before commit 850cbaddb52d ("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 <redacted>
Fixes: 850cbaddb52d ("udp: use it's own memory accounting schema")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>Applied.