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Date: Thu, 23 Feb 2023 21:29:16 -0500 From: nick black <dankamongmen@...il.com> To: netdev@...r.kernel.org Cc: Willem de Bruijn <willemb@...gle.com> Subject: [PATCH] [net] fix inaccuracies in msg_zerocopy.rst Replace "sendpage" with "sendfile". Remove comment about ENOBUFS when the sockopt hasn't been set; experimentation indicates that this is not true. Signed-off-by: nick black <dankamongmen@...il.com> --- Documentation/networking/msg_zerocopy.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git Documentation/networking/msg_zerocopy.rst Documentation/networking/msg_zerocopy.rst index 15920db8d35d..b3ea96af9b49 100644 --- Documentation/networking/msg_zerocopy.rst +++ Documentation/networking/msg_zerocopy.rst @@ -15,7 +15,7 @@ Opportunity and Caveats Copying large buffers between user process and kernel can be expensive. Linux supports various interfaces that eschew copying, -such as sendpage and splice. The MSG_ZEROCOPY flag extends the +such as sendfile and splice. The MSG_ZEROCOPY flag extends the underlying copy avoidance mechanism to common socket send calls. Copy avoidance is not a free lunch. As implemented, with page pinning, @@ -83,8 +83,8 @@ Pass the new flag. ret = send(fd, buf, sizeof(buf), MSG_ZEROCOPY); A zerocopy failure will return -1 with errno ENOBUFS. This happens if -the socket option was not set, the socket exceeds its optmem limit or -the user exceeds its ulimit on locked pages. +the socket exceeds its optmem limit or the user exceeds their ulimit on +locked pages. Mixing copy avoidance and copying -- 2.39.1
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