diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/sendfile.2 | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/lib/libc/sys/sendfile.2 b/lib/libc/sys/sendfile.2 index 57feb14..93420f6 100644 --- a/lib/libc/sys/sendfile.2 +++ b/lib/libc/sys/sendfile.2 @@ -25,7 +25,7 @@ .\" .\" $FreeBSD$ .\" -.Dd October 31, 2005 +.Dd November 24, 2006 .Dt SENDFILE 2 .Os .Sh NAME @@ -130,7 +130,7 @@ implementation of .Fn sendfile is "zero-copy", meaning that it has been optimized so that copying of the file data is avoided. .Sh TUNING -Internally, this system call uses a special +On some architectures, this system call internally uses a special .Fn sendfile buffer .Pq Vt "struct sf_buf" @@ -184,6 +184,13 @@ variables show current and peak buffers usage respectively. These values may also be viewed through .Nm netstat Fl m . +.Pp +If a value of zero is reported for +.Va kern.ipc.nsfbufs , +your architecture does not need to use +.Fn sendfile +buffers because their task can be efficiently performed +by the generic virtual memory structures. .Sh RETURN VALUES .Rv -std sendfile .Sh ERRORS @@ -262,6 +269,16 @@ The socket peer has closed the connection. .Xr socket 2 , .Xr writev 2 , .Xr tuning 7 +.Rs +.%A K. Elmeleegy +.%A A. Chanda +.%A A. L. Cox +.%A W. Zwaenepoel +.%T A Portable Kernel Abstraction for Low-Overhead Ephemeral Mapping Management +.%J The Proceedings of the 2005 USENIX Annual Technical Conference +.%P pp 223-236 +.%D 2005 +.Re .Sh HISTORY The .Fn sendfile |
