Date: Sun, 22 May 2022 22:33:16 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: freebsd-net <freebsd-net@freebsd.org> Subject: Can net interfaces efficiently transmit data in extpg mbufs? Message-ID: <YQBPR0101MB974247DA6698DEE079B920DADDD59@YQBPR0101MB9742.CANPRD01.PROD.OUTLOOK.COM>
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Hi, The current NFS code knows how to optionally put the large RPC messages (read/readdir replies and write requests) in extpg mbufs instead of mbuf clusters. This was done so that the data did not need to be copied when the KTLS (which requires extpg mbufs) is being used. However, I am wondering if putting the data in extpg mbufs might be a performance win for non-TLS use for some net interfaces? rick ps: (I do know that some network interfaces cannot handle extpg mbufs and, for them, the data must be copied to mbuf clusters. However, I am guessing that some network interface drivers can handle data to be sent in extpg mbufs.)
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