netdev - Re: [PATCH net-next] udp: be less conservative with sock rmem accounting

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Message-Id: <20161203.161502.2062069811901046717.davem@davemloft.net>
Date:   Sat, 03 Dec 2016 16:15:02 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, brouer@...hat.com
Subject: Re: [PATCH net-next] udp: be less conservative with sock rmem
 accounting

From: Paolo Abeni <pabeni@...hat.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 <brouer@...hat.com>
> Fixes: 850cbaddb52d ("udp: use it's own memory accounting schema")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Applied.