From: Florian Westphal <fw@strlen.de>
To: Netfilter Development <netfilter-devel@vger.kernel.org>
Subject: Re: Should we keep the advice to increase queue max length?
Date: Tue, 12 Dec 2023 02:09:28 +0100 [thread overview]
Message-ID: <20231212010928.GA16434@breakpoint.cc> (raw)
In-Reply-To: <ZXetLVAKMug1YvL3@slk15.local.net>
Duncan Roe <duncan_roe@optusnet.com.au> wrote:
> /proc/net/netfilter/nfnetlink_queue has a line for every active queue. The 3rd
> field is the number of queued packets. The max length is not in these lines but
> kernel source suggests it is 1024 by default. Anyway, I updated nfq6 to be able
> to set the max (using mnl functions).
>
> And I found the maximum number of queued packets is: 238. Further packets are
> dropped.
>
> If I lower the max below 238, limiting occurs at the new max.
>
> So I propose to drop the advice to increase the queue max length when I revise
> the libnetfilter_queue main page as part of the project to stop using
> libnfnetlink.
>
> Anyone have any comments?
This code is very old, it stems from a time where the network stack
did not do any kind of packet aggregation.
I think the hint should be removed as you suggest.
prev parent reply other threads:[~2023-12-12 1:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 0:45 Should we keep the advice to increase queue max length? Duncan Roe
2023-12-12 1:09 ` Florian Westphal [this message]
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