diff options
Diffstat (limited to 'Documentation/networking/msg_zerocopy.rst')
| -rw-r--r-- | Documentation/networking/msg_zerocopy.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/networking/msg_zerocopy.rst b/Documentation/networking/msg_zerocopy.rst index 15920db8d35d..b3ea96af9b49 100644 --- a/Documentation/networking/msg_zerocopy.rst +++ b/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 |