sk_buff chaining
John Justice (justice@quantumres.com)
Sat, 18 Dec 1999 17:32:50 -0500
My question is somewhat network oriented. It appears that LINUX socket
buffers sk_buff) contain the whole contiguous packet and there is no
mechanism to represent a packet as a scatter / gather list. For ethernet
(MTU=1500) this is not a problem, however, Fibre Channel devices specify an
MTU of 65280 bytes. The major problem is posting buffers to the adapter for
recieving packets. Under SOLARIS, for example, I can post 4k buffers to the
adapter. The driver can then chain these 4k buffers together if the packet
recieved is > 4K. With LINUX, however, I have to post 64K buffers to the
adapter since there is no mechanism to chain sk_buffs together. Depending
on the TCP/UDP application being run (like telnet / rlogin), this will be a
huge waste of memory. Is there a way to somehow chain sk_buffs in present /
future versions of LINUX?
Thanks much.
***********************************************************
* John Justice ** justice@quantumres.com *
* Quantum Research Services ** http://www.quantumres.com *
* Voice (919)544-4952 ** Fax: (919) 544-2918 *
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