netdev - Re: [RFC] skb_free_datagram() doing something expensive ?

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Message-Id: <20081104.154112.52727780.davem@davemloft.net>
Date:	Tue, 04 Nov 2008 15:41:12 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org, minyard@....org
Subject: Re: [RFC] skb_free_datagram() doing something expensive ?

From: Eric Dumazet <dada1@...mosbay.com>
Date: Wed, 05 Nov 2008 00:02:22 +0100

> tcp_memory_allocated do not have this problem, since tcp carefully calls sk_mem_reclaim(sk) only on
> selected paths, not on fast path.

I think something similar can be done for UDP.

Otherwise, yes, we'll need to do else something about it.

I guess your per-cpu idea, since we're trying to enforce
global limits, is to cache the available quota on a per-cpu
basis.  But I wonder if that can work properly.  If a
cpu gets overloaded and runs out of it's local quota, it'll
need to grab from another cpu.... hmmm...

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