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Add definition to recommend a new buffer size for netlink dumps.
Details are available here:
commit d35c99ff77ecb2eb239731b799386f3b3637a31e
Author: Eric Dumazet <edumazet@google.com>
Date: Thu Oct 6 04:13:18 2016 +0900
netlink: do not enter direct reclaim from netlink_dump()
iproute2 is using 32 KBytes buffer in netlink dumps to speed up netlink
dumps for a while. Let's recommend this buffer size through this new
definition. Update examples too.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: Florian Westphal <fw@strlen.de>
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I have decided to release the examples in this library in the public
domain. Jan Engelhardt, who has been the sole contributor so far, has
agreed with this re-licensing by communication via e-mail.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
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Davem spotted during the Netfilter Workshop that user-space applications
should use 8KB buffers for recv(). I accidentally found that NFLOG is
not following this approach (in this case we're using 131072 bytes
messages), we have to document this.
Anyway, according to linux/netlink.h (and to complete this log message):
"skb should fit one page. This choice is good for headerless malloc.
But we should limit to 8K so that userspace does not have to
use enormous buffer sizes on recvmsg() calls just to avoid
MSG_TRUNC when PAGE_SIZE is very large."
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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put examples files into specific directories according to the
Netlink bus they work with. And minor update in the readme file
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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