Subject: Re: adding mbuf member
To: None <email@example.com>
From: Michael C. Richardson <firstname.lastname@example.org>
Date: 01/30/2000 14:31:50
>>>>> "Jun-ichiro" == Jun-ichiro itojun Hagino <email@example.com> writes:
>>> For keeping IPsec decryption history and other information, I would
>>> like to add one variable into mbuf header (M_PKTHDR), like below.
>>> this will let us attach extra mbuf chain to mbuf.
>> I think that this is the right way to do this... Is there a way to
>> allocate the aux chain in the mbuf itself when external clusters are
Jun-ichiro> You mean reusing MH_databuf for aux data when the mbuf is a
Jun-ichiro> cluster mbuf? ((m->m_flags & M_EXT) != 0) I think that
Yeah, but perhaps just make the decision when allocating the aux data.
The trend as far as I can tell, is to make external clusters used as often
as possible since they avoid a data copy for packets bigger than the
threshold. As such, the mbuf itself is wasted, and allocating a second seems
silly to me.
:!mcr!: | Cow#1: Are you worried about getting Mad Cow Disease?
Michael Richardson | Cow#2: No. I'm a duck.
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