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Date:   Wed, 13 Feb 2019 13:57:18 -0800
From:   Stephen Hemminger <>
To:     Eric Dumazet <>
Cc:     David Ahern <>, netdev <>,
        Eric Dumazet <>,
        Hangbin Liu <>, Phil Sutter <>
Subject: Re: [PATCH iproute2] lib/libnetlink: ensure a minimum of 32KB for
 the buffer used in rtnl_recvmsg()

On Tue, 12 Feb 2019 17:58:41 -0800
Eric Dumazet <> wrote:

> In the past, we tried to increase the buffer size up to 32 KB in order
> to reduce number of syscalls per dump.
> Commit 2d34851cd341 ("lib/libnetlink: re malloc buff if size is not enough")
> brought the size back to 4KB because the kernel can not know the application
> is ready to receive bigger requests.
> See kernel commits 9063e21fb026 ("netlink: autosize skb lengthes") and
> d35c99ff77ec ("netlink: do not enter direct reclaim from netlink_dump()")
> for more details.
> Fixes: 2d34851cd341 ("lib/libnetlink: re malloc buff if size is not enough")
> Signed-off-by: Eric Dumazet <>
> Cc: Hangbin Liu <>
> Cc: Phil Sutter <>

Applied, although maybe we should bump it to 64K or bigger?

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